You searched for subject:(Spray cooling).
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1.
Pelissari, Julio Rafael.
Efeito da encapsulação de licopeno na sua estabilidade e biodisponibilidade.
Degree: Mestrado, Ciências da Engenharia de Alimentos, 2014, University of São Paulo
URL: http://www.teses.usp.br/teses/disponiveis/74/74132/tde-26092014-090346/ 
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► Licopeno, um pigmento natural considerado o mais potente antioxidante dentre os carotenoides, é oque tem maior incidência no soro humano. Seu consumo regular está relacionado…
(more)
▼ Licopeno, um pigmento natural considerado o mais potente antioxidante dentre os carotenoides, é oque tem maior incidência no soro humano. Seu consumo regular está relacionado principalmente com a prevenção do câncer de próstata. Porém, estudos também demonstram sua relação com a prevenção de câncer de pâncreas e bexiga, doenças cardiovasculares como a aterosclerose e doenças neurodegenerativas. Todavia, por ser altamente insaturado o licopeno é susceptível à degradação, sendo degradado na presença de luz, oxigênio e se exposto a altas temperaturas. A microencapsulação entra como uma alternativa para tentar garantir maior estabilidade a este carotenoide. A técnica de
spray-chilling, por dispensar o emprego de altas temperaturas e solventes durante o processo de atomização, representa uma alternativa promissora na encapsulação do licopeno. Os objetivos deste trabalho foram encapsular uma solução oleosa de licopeno (10%) através da técnica de
spray-chilling,utilizando gordura vegetal low trans como carreador, caracterizar as micropartículas obtidas e avaliar a biodisponibilidade do licopeno livre e encapsulado em ratos wistars. Foram formulados seis tratamentos, que diferiam pela concentração de solução comercial de licopeno, sendo T1 com 20%, T2 com 23,1%, T3 com 28,6%, T4 com 33,3%, T5 com 17,9% mais 10% de goma arábica e T6 com 19,2% mais 5% de carboximetilcelulose (CMC). As micropartículas obtidas destes tratamentos foram avaliadas quanto a tamanho e distribuição, morfologia por microscopia eletrônica de varredura (MEV), espectroscopia de infravermelho com transformadas de Fourier (FT-IR), difração de raios-X (DRX). A estabilidade do licopeno encapsulado foi avaliada em diferentes condições de armazenamento (sob vácuo, umidade relativa de 33%, temperatura de refrigeração e ambiente) e também foi determinada por meio de quantificações periódicas de licopeno, bem como através da análise análise da cor instrumental. A biodisponibilidade foi avaliada utilizando-se 68 animais divididos em grupos, para os quais se administrou por gavagem o licopeno livre e o encapsulado. O tamanho das micropartículas obtidas ficou em torno de 60-110 µm e a distribuição foi polidispersa, independente da concentração de licopeno. A microscopia revelou micropartículas esféricas, com superfície rugosa, com alguns poros e tamanhos variados. No FT-IR verificou-se que não houve formação de ligações distintas na solução oleosa de licopeno e nas amostras atomizadas. Nos difratogramas observou-se a presença da forma polimórfica β para o agente carreador e para as micropartículas. Na estabilidade a adição da goma arábica e o armazenamento sob temperatura de refrigeração e vácuo, foram as melhores condições para retardar a degradação do licopeno. Os resultados dos ensaios de biodisponibilidade foram inconclusivos. Desta forma, conclui-se que é possível encapsular licopeno através da técnica de
spray-chilling, porém, para trabalhos futuros, seriam necessários aprimoramentos na técnica de encapsulação e/ou na formulação para conferir maior…
Advisors/Committee Members: Fávaro-Trindade, Carmen Silvia.
Subjects/Keywords: Spray-chilling; Spray-chilling; Spray-cooling; Spray-cooling; Carotenoid; Carotenoide; Estabilidade; Microencapsulação; Microencapsulation; Stability
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APA (6th Edition):
Pelissari, J. R. (2014). Efeito da encapsulação de licopeno na sua estabilidade e biodisponibilidade. (Masters Thesis). University of São Paulo. Retrieved from http://www.teses.usp.br/teses/disponiveis/74/74132/tde-26092014-090346/ ;
Chicago Manual of Style (16th Edition):
Pelissari, Julio Rafael. “Efeito da encapsulação de licopeno na sua estabilidade e biodisponibilidade.” 2014. Masters Thesis, University of São Paulo. Accessed August 17, 2019.
http://www.teses.usp.br/teses/disponiveis/74/74132/tde-26092014-090346/ ;.
MLA Handbook (7th Edition):
Pelissari, Julio Rafael. “Efeito da encapsulação de licopeno na sua estabilidade e biodisponibilidade.” 2014. Web. 17 Aug 2019.
Vancouver:
Pelissari JR. Efeito da encapsulação de licopeno na sua estabilidade e biodisponibilidade. [Internet] [Masters thesis]. University of São Paulo; 2014. [cited 2019 Aug 17].
Available from: http://www.teses.usp.br/teses/disponiveis/74/74132/tde-26092014-090346/ ;.
Council of Science Editors:
Pelissari JR. Efeito da encapsulação de licopeno na sua estabilidade e biodisponibilidade. [Masters Thesis]. University of São Paulo; 2014. Available from: http://www.teses.usp.br/teses/disponiveis/74/74132/tde-26092014-090346/ ;
2.
Oliveira, Daniela Lara Pedroso de.
Produção e avaliação de micropartículas lipídicas contendo Lactobacillus acidophilus ou Bifidobacterium lactis produzidas por spray chiling.
Degree: Mestrado, Ciências da Engenharia de Alimentos, 2011, University of São Paulo
URL: http://www.teses.usp.br/teses/disponiveis/74/74132/tde-17112011-101818/
;
► Lactobacillus acidophilus e Bifidobacterium lactis são microrganismos probióticos frequentemente utilizados em alimentos funcionais. No entanto, estes microrganismos devem resistir ao processamento, à estocagem do alimento,…
(more)
▼ Lactobacillus acidophilus e Bifidobacterium lactis são microrganismos probióticos frequentemente utilizados em alimentos funcionais. No entanto, estes microrganismos devem resistir ao processamento, à estocagem do alimento, e sobreviver à passagem pelo trato-gastrointestinal, para chegarem ativos ao intestino e exercerem seus efeitos benéficos. Uma vez que os probióticos são sensíveis a uma série de fatores, tais como meio ácido, sais biliares e presença de oxigênio, a microencapsulação tem sido estudada com objetivo de protegê-los aos efeitos adversos do ambiente, além de promover a liberação controlada no local de ação do microrganismo, melhorando sua eficiência. Este trabalho teve como objetivo a produção e avaliação de micropartículas lipídicas contendo B. lactis ou L. acidophilus, produzidas por spray chilling, utilizando gorduras de baixo ponto de fusão, tais como gordura de palma e manteiga de cacau, como agente encapsulante. O diâmetro médio e a morfologia das partículas foram avaliados. Ensaios de sobrevivência foram conduzidos com objetivo de avaliar a resistência dos microrganismos ao processo encapsulação, resistência in vitro aos fluidos gástrico e intestinal simulados e estabilidade das células durante 90 dias de armazenamento a -18, 7 e 20 ou 37°C, dependendo da gordura utilizada. As micropartículasapresentaram-se em formato esféricoe com diâmetro médio que pode permitir o fácil escoamento no alimento, sem proporcionar impacto tecnológico negativo.A tecnologia de encapsulação por spray chilling, utilizando gordura de palma e manteiga de cacau, como agentes encapsulantes, proporcionou a obtenção de micropartículas eficientes na proteção dos probióticos frente ao processo de encapsulação e na manutenção da estabilidade das células quando estocados sob congelamento. Entretanto, aeficiência das micropartículas frente aos fluidos gastrointestinais e a estabilidade das células quando estocadas a 7 e 20 ou 37°C variaram de acordo com a gordura utilizada e com o microrganismo encapsulado. As micropartículas lipídicas obtidas são, portanto, uma matriz inovadora para a aplicação de probióticos, de baixo custo e com grande possibilidade de obtenção em escala industrial. O desafio futuro para o presente estudo é a seleção de um agente encapsulante que aumente a estabilidade das células, nas temperaturas ambiente e de refrigeração, a fim de aumentar as possibilidades de aplicação destas microcápsulas em produtos alimentícios.
L. acidophilus and Bifidobacterium lactis are probiotic microorganisms frequently used in food product. However they must remain viable during processing, entire shelf life of product and passing-through the gastrointestinal tract to provide beneficial effects on human health. Since theses microorganisms are sensitive to a series of factors, especially presence of oxygen and acid medium, microencapsulation has been studied as an alternative to increase probiotic cells viability and to provide the controlled release in the site of action, improving their efficiency. The aim of this study was…
Advisors/Committee Members: Fávaro-Trindade, Carmen Silvia.
Subjects/Keywords: Spray cooling; Encapsulação; Encapsulation; Probióticos; Probiotics; Spray cooling; Viabilidade; Viability
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APA (6th Edition):
Oliveira, D. L. P. d. (2011). Produção e avaliação de micropartículas lipídicas contendo Lactobacillus acidophilus ou Bifidobacterium lactis produzidas por spray chiling. (Masters Thesis). University of São Paulo. Retrieved from http://www.teses.usp.br/teses/disponiveis/74/74132/tde-17112011-101818/ ;
Chicago Manual of Style (16th Edition):
Oliveira, Daniela Lara Pedroso de. “Produção e avaliação de micropartículas lipídicas contendo Lactobacillus acidophilus ou Bifidobacterium lactis produzidas por spray chiling.” 2011. Masters Thesis, University of São Paulo. Accessed August 17, 2019.
http://www.teses.usp.br/teses/disponiveis/74/74132/tde-17112011-101818/ ;.
MLA Handbook (7th Edition):
Oliveira, Daniela Lara Pedroso de. “Produção e avaliação de micropartículas lipídicas contendo Lactobacillus acidophilus ou Bifidobacterium lactis produzidas por spray chiling.” 2011. Web. 17 Aug 2019.
Vancouver:
Oliveira DLPd. Produção e avaliação de micropartículas lipídicas contendo Lactobacillus acidophilus ou Bifidobacterium lactis produzidas por spray chiling. [Internet] [Masters thesis]. University of São Paulo; 2011. [cited 2019 Aug 17].
Available from: http://www.teses.usp.br/teses/disponiveis/74/74132/tde-17112011-101818/ ;.
Council of Science Editors:
Oliveira DLPd. Produção e avaliação de micropartículas lipídicas contendo Lactobacillus acidophilus ou Bifidobacterium lactis produzidas por spray chiling. [Masters Thesis]. University of São Paulo; 2011. Available from: http://www.teses.usp.br/teses/disponiveis/74/74132/tde-17112011-101818/ ;
3.
Gavory, Cécile.
Microencapsulation d’un adhésif sensible à la pression par des procédés d’atomisation : Microencapsulation of a pressure sensitive adhesive by methods based on atomization.
Degree: Docteur es, Chimie. Procédés, 2012, Université Claude Bernard – Lyon I
URL: http://www.theses.fr/2012LYO10189
► L'objectif de ce travail de thèse consiste en l'étude de l'encapsulation, par des procédés d'atomisation, d'un adhésif sensible à la pression se présentant sous la…
(more)
▼ L'objectif de ce travail de thèse consiste en l'étude de l'encapsulation, par des procédés d'atomisation, d'un adhésif sensible à la pression se présentant sous la forme d'une émulsion aqueuse. Des microparticules de diamètres moyens inférieurs à 50 μm et à base d'éthylcellulose plastifiée ont été élaborées par spray-drying ; la proportion d'adhésif incorporé a pu atteindre 25% en masse. L'encapsulation a également été réalisée par spraycooling avec des matières d'enrobage fusibles, notamment avec une huile de palme totalement hydrogénée. Un plan de criblage a été réalisé et a permis d'identifier des conditions optimales avec 50% d'adhésif et 2% d'un tensioactif lipophile : des tailles équivalentes aux précédentes et une adhésion maximale de l'ordre de 6 N après rupture des particules ont été obtenues. Le polymorphisme relatif aux matières grasses a été mis en évidence et des analyses couplées ont permis de mettre au point un traitement thermique adéquat pour s'en affranchir. Des tests de résistance mécaniques de microparticules unitaires de diamètres inférieures à 20 μm ont été menés et ont montré pour les deux types de particules des niveaux de forces de rupture de quelques centaines de micronewtons et une relation quasi linéaire entre ces forces et les tailles de particules
The aim of this work was to microencapsulate a water-based pressure sensitive adhesive by mechanical methods based on atomization. Microparticles having a mean diameter inferior to 50 μm have been produced by spray-drying with a wall material made up of plastified ethylcellulose; the proportion of adhesive incorporated reached 25% w/w. Besides, the microencapsulation of the adhesive was achieved by spray-cooling with fusible wall materials. A totally hydrogenated palm oil was especially selected. An experimental screening design was carried out: optimal formulation conditions were identified, namely 50% adhesive and 2% of a lipophilic emulsifier. Mean diameter size of the microparticles collected was equivalent to the spray-dried one and their adhesive forces reached 6 N after crushing. Polymorphism inherent in fats subjected to quenching was brought to light and coupled analyses enabled to set an appropriate thermal treatment to overcome it. Mechanical tests performed on unitary microparticles having diameters inferior to 20 μm and elaborated by both spray methods revealed that the order of magnitude of the crushing forces was about few hundreds micronewtons and the forces raised almost linearly with the particles size
Advisors/Committee Members: Fessi, Hatem (thesis director).
Subjects/Keywords: Microencapsulation; Adhésif; Spray-drying; Spray-cooling; Résistance mécanique; Microencapsulation; Adhesive; Spray-drying; Spray-cooling; Strength; 660.2
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APA ·
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Manager
APA (6th Edition):
Gavory, C. (2012). Microencapsulation d’un adhésif sensible à la pression par des procédés d’atomisation : Microencapsulation of a pressure sensitive adhesive by methods based on atomization. (Doctoral Dissertation). Université Claude Bernard – Lyon I. Retrieved from http://www.theses.fr/2012LYO10189
Chicago Manual of Style (16th Edition):
Gavory, Cécile. “Microencapsulation d’un adhésif sensible à la pression par des procédés d’atomisation : Microencapsulation of a pressure sensitive adhesive by methods based on atomization.” 2012. Doctoral Dissertation, Université Claude Bernard – Lyon I. Accessed August 17, 2019.
http://www.theses.fr/2012LYO10189.
MLA Handbook (7th Edition):
Gavory, Cécile. “Microencapsulation d’un adhésif sensible à la pression par des procédés d’atomisation : Microencapsulation of a pressure sensitive adhesive by methods based on atomization.” 2012. Web. 17 Aug 2019.
Vancouver:
Gavory C. Microencapsulation d’un adhésif sensible à la pression par des procédés d’atomisation : Microencapsulation of a pressure sensitive adhesive by methods based on atomization. [Internet] [Doctoral dissertation]. Université Claude Bernard – Lyon I; 2012. [cited 2019 Aug 17].
Available from: http://www.theses.fr/2012LYO10189.
Council of Science Editors:
Gavory C. Microencapsulation d’un adhésif sensible à la pression par des procédés d’atomisation : Microencapsulation of a pressure sensitive adhesive by methods based on atomization. [Doctoral Dissertation]. Université Claude Bernard – Lyon I; 2012. Available from: http://www.theses.fr/2012LYO10189
Texas A&M University
4.
Yang, Yuxuan.
Suppression and Enhancement of Boiling Associated with Multiple Droplet Impingement.
Degree: 2014, Texas A&M University
URL: http://hdl.handle.net/1969.1/152450
► Spray cooling has proven to be efficient in managing thermal load in high power applications. Reliability of electronic products lies on the thermal management and…
(more)
▼ Spray cooling has proven to be efficient in managing thermal load in high power
applications. Reliability of electronic products lies on the thermal management and
understanding of heat transfer mechanisms of the most commonly used thermal
management schemes such as
spray cooling. Many experiments have been done to
understand the heat transfer mechanisms associated with
spray cooling. However, most
of them have relied on comprehensive
spray cooling experiments where multiple physical
variables are at play simultaneously. Furthermore, experiments with single streams of
droplets have not been able to elucidate the effects of the onset of boiling (ONB) during
the droplet impingement process. Therefore, efforts have been undertaken to consider the
effects of using three droplet streams arranged in a triangulated fashion. The effects of
using triangulated multiple droplet impingements on the suppression or enhancement of
boiling on heated surfaces has been investigated. Moreover, the effects of using screen
laminated on the suppression of ONB during the droplet impingement process has been
studied in detail. The main goal of this project is to study the effects of multiple droplet
impingement on the flat heater surface in the
spray cooling with and without the use of
metallic screen laminates. Single and triple droplet impingement experiments have been
performed to understand the droplet behavior in
spray cooling systems where multiple
droplets simultaneously impact a heated surface.
The experiments consisted of using a stainless steel screen laminate over a sample surface to observe the suppression or enhancement of pool boiling which tends to occur at the periphery of each droplet impingement zone. An infrared-based imaging technique was used to measure surface temperature during droplet impingement. The heat transfer performance has been evaluated in terms of heat flux, droplet frequency and volume flow rate. The results indicate that droplet stream spacing and the use of copper meshes can enhance surface
cooling significantly. Specifically, droplet stream spacing of 1000 ?m with copper meshes with a 6 mm hole and gap of 0.2 mm lead to enhanced surface
cooling during the multiple droplet impingement process. It is expected that the results and conclusions of this study will be useful in understanding the physics of
spray cooling which should help design better
spray cooling system.
Advisors/Committee Members: Alvarado, Jorge (advisor), Pate, Michael (committee member), Yassin, Hassan A. (committee member).
Subjects/Keywords: Spray Cooling; Multiple Stream Droplets; Screen Laminates
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APA ·
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APA (6th Edition):
Yang, Y. (2014). Suppression and Enhancement of Boiling Associated with Multiple Droplet Impingement. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/152450
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Yang, Yuxuan. “Suppression and Enhancement of Boiling Associated with Multiple Droplet Impingement.” 2014. Thesis, Texas A&M University. Accessed August 17, 2019.
http://hdl.handle.net/1969.1/152450.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Yang, Yuxuan. “Suppression and Enhancement of Boiling Associated with Multiple Droplet Impingement.” 2014. Web. 17 Aug 2019.
Vancouver:
Yang Y. Suppression and Enhancement of Boiling Associated with Multiple Droplet Impingement. [Internet] [Thesis]. Texas A&M University; 2014. [cited 2019 Aug 17].
Available from: http://hdl.handle.net/1969.1/152450.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Yang Y. Suppression and Enhancement of Boiling Associated with Multiple Droplet Impingement. [Thesis]. Texas A&M University; 2014. Available from: http://hdl.handle.net/1969.1/152450
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
NSYSU
5.
Chen, Jia-Wei.
Characterization of Water Spray Temperature Distribution and Liquid Film Growth Processes.
Degree: Master, Mechanical and Electro-Mechanical Engineering, 2011, NSYSU
URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0907111-155440
► The aim of this study was to explore the properties of thermal field in spray cooling via experiments. The nozzle diameter (dj) used herein was…
(more)
▼ The aim of this study was to explore the properties of thermal field in
spray cooling via experiments. The nozzle diameter (dj) used herein was 200 μm and the heating surface measured 45 mm à 45 mm. The study was divided into two parts for experiments and analyses. In the first part, with DI water and FC-72 (dielectric liquid) as the working media, the changes in the liquid film thickness on the heater surface under different values of heating power were observed; heat input (Q) and value of gauge pressure (ÎP) were taken as the main parameters for discussing the influence of these two parameters on the liquid film thickness in
spray cooling. The second part, with DI water as the working medium, adopted the μLIF system (fluorescent dye: Rhodamine B; concentration: 1.5Ã10-4 M) to measure the effect of different working medium temperatures (23 °C, 30 °C, and 40 °C) on the global temperature distribution, liquid film temperature changes on the heater surface and the thermal field condition of
spray cooling, with an aim of exploring the internal physical phenomena of the droplets during
cooling.
Advisors/Committee Members: Ching-Jeng Ho (chair), Shou-Shing Hsieh (committee member), Shin-Chia Su (chair).
Subjects/Keywords: spray cooling; μLIF; spray; liquid film thickness; droplets
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Record Details
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APA ·
Chicago ·
MLA ·
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CSE |
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to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Chen, J. (2011). Characterization of Water Spray Temperature Distribution and Liquid Film Growth Processes. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0907111-155440
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Chen, Jia-Wei. “Characterization of Water Spray Temperature Distribution and Liquid Film Growth Processes.” 2011. Thesis, NSYSU. Accessed August 17, 2019.
http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0907111-155440.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Chen, Jia-Wei. “Characterization of Water Spray Temperature Distribution and Liquid Film Growth Processes.” 2011. Web. 17 Aug 2019.
Vancouver:
Chen J. Characterization of Water Spray Temperature Distribution and Liquid Film Growth Processes. [Internet] [Thesis]. NSYSU; 2011. [cited 2019 Aug 17].
Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0907111-155440.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Chen J. Characterization of Water Spray Temperature Distribution and Liquid Film Growth Processes. [Thesis]. NSYSU; 2011. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0907111-155440
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Stellenbosch University
6.
Roux, Daniel.
Evaluation and performance enhancement of cooling tower spray zones.
Degree: MScEng, Mechanical and Mechatronic Engineering, 2012, Stellenbosch University
URL: http://hdl.handle.net/10019.1/71944
► ENGLISH ABSTRACT: The performance of wet cooling towers can be improved by installing spray nozzles that distribute the cooling water uniformly onto the fill whilst…
(more)
▼ ENGLISH ABSTRACT: The performance of wet cooling towers can be improved by installing spray
nozzles that distribute the cooling water uniformly onto the fill whilst operating at
a low pressure head. In this thesis, three commercial spray nozzles are
experimentally evaluated in terms of flow and pressure loss characteristics as well
as water distribution patterns. The results of the evaluation process highlight the
need for spray nozzles with enhanced performance characteristics. The theory
required to implement the results of the evaluation process in the design of a
cooling tower is presented and discussed. A systematic approach to enhance the
performance of a spray nozzle through minor alterations is applied to one of the
commercial spray nozzles that was evaluated. The fluid dynamics of an orifice
nozzle, such as the effect of a change in pressure head, spray angle, spray height,
orifice diameter and wall thickness on drop diameter and spray distance, is
experimentally investigated and a model with which a spray nozzle can be
designed is finally presented. Two prototype spray nozzles show that it is possible
to enhance the performance of spray nozzles and thus wet cooling towers by
means of the methods presented.
AFRIKAANSE OPSOMMING: Die werkverrigting van natkoeltorings kan verbeter word deur sproeiers te
installeer wat die verkoelingswater uniform versprei op die pakking teen 'n lae
pomp drukhoogte. In hierdie tesis word drie kommersiële sproeiers
eksperimenteel geëvalueer in terme van vloei en drukverlies eienskappe sowel as
water verdelings patrone. Die resultate van die evaluasie proses beklemtoon die
behoefte aan sproeiers met verbeterde werkverrigtingseienskappe. Die teorie wat
benodig word om die resultate van die evaluasie proses te implementeer in die
ontwerp van 'n natkoeltoring word bespreek. 'n Stelselmatige benadering om die
werkverrigtings van 'n sproeier te verhoog deur klein veranderinge aan die
ontwerp aan te bring, word toegepas op een van die sproeiers wat getoets is. Die
vloeidinamika van 'n plaatmondstuk, soos die effek van 'n verandering in
drukhoogte, sproeihoek, sproeihoogte, gatdiameter en wanddikte op druppel
diameter en sproeiafstand, is eksperimenteel ondersoek en 'n model word
aangebied waarmee 'n sproeier ontwerp kan word. Twee prototipe sproeiers wys
dat dit moontlik is om die werkverrigting van sproeiers, en dus ook
natkoeltorings, te verbeter deur die metodes wat in die tesis aangebied word, toe
te pas.
Advisors/Committee Members: Reuter, H. C. R., Stellenbosch University. Faculty of Engineering. Dept. of Mechanical and Mechatronic Engineering..
Subjects/Keywords: Water distribution; Spray patterns; Cooling towers; Spray nozzles; Mechanical & Mechatronic Engineering
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
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to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Roux, D. (2012). Evaluation and performance enhancement of cooling tower spray zones. (Masters Thesis). Stellenbosch University. Retrieved from http://hdl.handle.net/10019.1/71944
Chicago Manual of Style (16th Edition):
Roux, Daniel. “Evaluation and performance enhancement of cooling tower spray zones.” 2012. Masters Thesis, Stellenbosch University. Accessed August 17, 2019.
http://hdl.handle.net/10019.1/71944.
MLA Handbook (7th Edition):
Roux, Daniel. “Evaluation and performance enhancement of cooling tower spray zones.” 2012. Web. 17 Aug 2019.
Vancouver:
Roux D. Evaluation and performance enhancement of cooling tower spray zones. [Internet] [Masters thesis]. Stellenbosch University; 2012. [cited 2019 Aug 17].
Available from: http://hdl.handle.net/10019.1/71944.
Council of Science Editors:
Roux D. Evaluation and performance enhancement of cooling tower spray zones. [Masters Thesis]. Stellenbosch University; 2012. Available from: http://hdl.handle.net/10019.1/71944
University of Illinois – Urbana-Champaign
7.
Zhou, Xiaoxu.
Heat transfer during spray water cooling using steady experiments.
Degree: MS, 0139, 2010, University of Illinois – Urbana-Champaign
URL: http://hdl.handle.net/2142/14640
► Spray water cooling is widely used in many industrial processes to control heat removal from a hot material surface. In order to control heat transfer…
(more)
▼ Spray water
cooling is widely used in many industrial processes to control heat removal from a hot material surface. In order to control heat transfer rates and obtain desired surface temperature distributions, a deeper understanding of fundamental
spray cooling dynamics and more accurate estimation of
spray heat transfer rates is needed. In this thesis, a new technique combining experiment and computational modeling has been developed for measuring the steady-state heat transfer extracted locally by water sprays or air-mists impinging on the surface of a hot metallic sample.
The experimental apparatus was developed by A. C. Hernandez B., H. Castillejos E, and F. A. Acosta Gat CINVESTAV, Mexico, and is designed to be able to employ
spray water to cool the metallic sample accommodated inside a copper coil with an alternating current as induction heating goes on inside the sample. Control of total input power from the wall maintains each desired sample thermocouple temperature. A computational model developed using the commercial finite-element package COMSOL Mutiphysics uses a two-dimensional axisymmetric model of the electromagnetics and heat-conduction equations to balance the heat extracted from the sample surface by the boiling water droplets. Measurement of the RMS current flowing through the copper coil enables the model to estimate the heat extracted to the
cooling spray by matching the sample thermocouple temperature measurement. Heat transfer coefficients and fluxes are quantified for
spray cooling of a platinum sample at temperatures ranging from 100-1200???C, using typical air-mist nozzles and conditions relevant to steel continuous casting, and also compared with transient measurement results of
spray cooling and Nozaki empirical correlation. The results reveal the flexibility of the technique to investigate different aspects of
spray cooling. The
spray heat transfer coefficients extracted range from 1 kW/m2K to 27kW/m2K, and heat fluxes rang from 0.5MW/m2 to 5MW/m2 as the sample surface temperature varies from 80 °C to 1185 °C Heat removal hysteresis exists during the
spray heating-
cooling cycle. The Leidenfrost temperature is found to be around at 850 °C.
Advisors/Committee Members: Thomas, Brian G. (advisor).
Subjects/Keywords: Spray cooling; Heat transfer; Induction heating; Spray heat transfer coefficient
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APA (6th Edition):
Zhou, X. (2010). Heat transfer during spray water cooling using steady experiments. (Thesis). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/14640
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Zhou, Xiaoxu. “Heat transfer during spray water cooling using steady experiments.” 2010. Thesis, University of Illinois – Urbana-Champaign. Accessed August 17, 2019.
http://hdl.handle.net/2142/14640.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Zhou, Xiaoxu. “Heat transfer during spray water cooling using steady experiments.” 2010. Web. 17 Aug 2019.
Vancouver:
Zhou X. Heat transfer during spray water cooling using steady experiments. [Internet] [Thesis]. University of Illinois – Urbana-Champaign; 2010. [cited 2019 Aug 17].
Available from: http://hdl.handle.net/2142/14640.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Zhou X. Heat transfer during spray water cooling using steady experiments. [Thesis]. University of Illinois – Urbana-Champaign; 2010. Available from: http://hdl.handle.net/2142/14640
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
NSYSU
8.
Liu, Hao-hsiang.
Spray Heat Transfer with Different Nanofluids.
Degree: Master, Mechanical and Electro-Mechanical Engineering, 2015, NSYSU
URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0621115-133426
► This study aims to establish a spray cooling system with nanofluids and investigate its heat transfer performance. In previous study of spray cooling, nozzle diameter…
(more)
▼ This study aims to establish a
spray cooling system with nanofluids and investigate its heat transfer performance. In previous study of
spray cooling, nozzle diameter (dj), volumetric flow rate(Q), distance(Z) between nozzle and test surface, and subcooling temperature(Tsub) and so on will influence heat transfer performance. However, in our study, foucs on heat transfer performance enhancement by nanofluids, so all of mentioned parameter above are constant, which dj is 270(μm), Q is 0.36(L/min), Z is 30(mm) and (Tsub) is 72(â). A brass block was used as the test surface in the experiment. This study then added different nanoparticles (silver, carbon nanotube, aluminum, titanium dioxide, silicon dioxide, aluminum oxide, and ferric ferrous oxide) into the deionized water to produce the nanofluids. The nanofluids were later atomized with nozzle and sprayed on the test surface to improve the heat dissipation capability of the
spray cooling system. Using steady-state method and transient method in the experiment, this study observed the boiling phenomenon when spraying the deionized water and different nanofluids with different concentration on the test surface, and recorded the temperature variation on the test surface. The results were presented in the boiling curve graph and the
cooling curve graph. The ultimate objective of this study is to compare the heat dissipation performance of the nanofluids made of major nanoparticles available in the market with that of the deionized water and make an in-depth analysis, hoping the results can be applied to electronic component heat sinks and to solve the problem of rapid increase of thermal power on the electronic componentsâ unit areas.
Advisors/Committee Members: Mei-Ling Wu (chair), Shou-Shing Hsieh (committee member), Chi-Hui Chien (chair), Cheng-Tsung Liu (chair).
Subjects/Keywords: nanofluid; spray cooling; cooling curve; boiling curve; critical heat flux
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APA (6th Edition):
Liu, H. (2015). Spray Heat Transfer with Different Nanofluids. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0621115-133426
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Liu, Hao-hsiang. “Spray Heat Transfer with Different Nanofluids.” 2015. Thesis, NSYSU. Accessed August 17, 2019.
http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0621115-133426.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Liu, Hao-hsiang. “Spray Heat Transfer with Different Nanofluids.” 2015. Web. 17 Aug 2019.
Vancouver:
Liu H. Spray Heat Transfer with Different Nanofluids. [Internet] [Thesis]. NSYSU; 2015. [cited 2019 Aug 17].
Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0621115-133426.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Liu H. Spray Heat Transfer with Different Nanofluids. [Thesis]. NSYSU; 2015. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0621115-133426
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
NSYSU
9.
Yeh, Yi-Fan.
Spray Cooling Thermal and Flow Characteristics for High Power Electronic Devices.
Degree: Master, Mechanical and Electro-Mechanical Engineering, 2017, NSYSU
URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0711117-201256
► The purpose of this experiment is to use the piezoelectric atomizer film as a nozzle, set up a high-power electronic devices (⥠100W COB LED)…
(more)
▼ The purpose of this experiment is to use the piezoelectric atomizer film as a nozzle, set up a high-power electronic devices (⥠100W COB LED) based micro-
spray cooling system to study the different experimental parameters under the conditions of this micro-
spray cooling system of various physical phenomenon. In this experiment, the
spray velocity,
spray particle size and temperature were measured, and the advanced optical measurement system (μPIV, μIPI, LIF and IR detector) was used as the main measurement tool. The experimental parameters of the micro-
spray cooling system were changed during the measurement, such as porcelain diameter, mass flow rate, heat flux and
spray distance, to discuss the effect of heat dissipation on electronic devices, while observing the change of trajectory and particle size of atomized droplets during flight and study their physical phenomena.
Advisors/Committee Members: Hsieh, Shou-Shing (committee member), Chen, Chao-Kuang (chair), Ho, Ching-Jenq (chair), Chien, Chi-Hui (committee member).
Subjects/Keywords: LED cooling; μPIV; μIPI; High powered electronic devices; Spray cooling; Piezoelectric atomizer film
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APA ·
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MLA ·
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CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Yeh, Y. (2017). Spray Cooling Thermal and Flow Characteristics for High Power Electronic Devices. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0711117-201256
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Yeh, Yi-Fan. “Spray Cooling Thermal and Flow Characteristics for High Power Electronic Devices.” 2017. Thesis, NSYSU. Accessed August 17, 2019.
http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0711117-201256.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Yeh, Yi-Fan. “Spray Cooling Thermal and Flow Characteristics for High Power Electronic Devices.” 2017. Web. 17 Aug 2019.
Vancouver:
Yeh Y. Spray Cooling Thermal and Flow Characteristics for High Power Electronic Devices. [Internet] [Thesis]. NSYSU; 2017. [cited 2019 Aug 17].
Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0711117-201256.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Yeh Y. Spray Cooling Thermal and Flow Characteristics for High Power Electronic Devices. [Thesis]. NSYSU; 2017. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0711117-201256
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
NSYSU
10.
Lin, Ming-siang.
Flow/Heat Transfer Characteristics Analysis of Spray Cooling.
Degree: Master, Mechanical and Electro-Mechanical Engineering, 2016, NSYSU
URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0731116-085423
► Spray cooling has been proven to be efficient in managing high power thermal load. Due to the MEMS technology, the spray nozzle plate has been…
(more)
▼ Spray cooling has been proven to be efficient in managing high power thermal load. Due to the MEMS technology, the
spray nozzle plate has been reduced to minute size or even microscale with low power consumption. However, several of the key heat transfer mechanisms are still not well understood.
The main goal of this study is to observe the velocity characteristics of the
spray field, droplets distribution along the downstream, the boiling/
cooling curves and the
cooling performance.
In this study, we use a commercial PZT nozzle plate with three different nozzle diameters of dj = 7 μm, 10 μm and 35 μm. The corresponding volumetric rate is 3.47 ml/min, 6.53 ml/min and 50 ml/min, respectively. The PZT atomizer is composed of Ni-Co alloy nozzle plate bounded to the PZT ring actuator. The approximate numbers of micro nozzles on a circular Ni-Co plate are 2288 and 1071 corresponding to dj = 7 μm and 35 μm, respectively.
We use DI water as working fluid spraying on a copper flat heater which the target surface area is 2x2 cm2 and with a 14.5 mm thickness. The main experimental parameters are the
spray height, H (30, 40, 50, 70, 90 mm), the initial temperature of the heater surface, Ts (300, 200, 100 ºC), and nozzle diameter, dj (7, 10, 35 μm). Both a transient and steady boiling curve are obtained as well as the quenching
cooling curve. The results show that the average heat transfer coefficient (HTC) and the associated critical heat flux(CHF) could be over 2W/cm-K(HTC) and 200W/cm2(CHF), respectively.
Furthermore, by using micro particle image velocimetry (μPIV) and Interferometric particle Imaging (IPI) systems, we could image and analyze the velocity and droplet size of the
spray field. Besides, we also study the droplets dynamics to understand the droplet-surface interactions relevant to
spray cooling.
Advisors/Committee Members: C. J. Ho (chair), Shou-Shing Hsieh (committee member), Chao-Kuang Chen (chair), Chi-Hui Chien (committee member).
Subjects/Keywords: PZT nozzle plate; Droplet characteristics; IPI; μPIV; boiling/cooling curve; Spray cooling
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APA ·
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CSE |
Export
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Manager
APA (6th Edition):
Lin, M. (2016). Flow/Heat Transfer Characteristics Analysis of Spray Cooling. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0731116-085423
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Lin, Ming-siang. “Flow/Heat Transfer Characteristics Analysis of Spray Cooling.” 2016. Thesis, NSYSU. Accessed August 17, 2019.
http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0731116-085423.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Lin, Ming-siang. “Flow/Heat Transfer Characteristics Analysis of Spray Cooling.” 2016. Web. 17 Aug 2019.
Vancouver:
Lin M. Flow/Heat Transfer Characteristics Analysis of Spray Cooling. [Internet] [Thesis]. NSYSU; 2016. [cited 2019 Aug 17].
Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0731116-085423.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Lin M. Flow/Heat Transfer Characteristics Analysis of Spray Cooling. [Thesis]. NSYSU; 2016. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0731116-085423
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
NSYSU
11.
Tsai, Huand-Hsiu.
An Experimental Study of Jet Impingement and Spray Cooling.
Degree: PhD, Mechanical and Electro-Mechanical Engineering, 2006, NSYSU
URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0720106-130031
► An experimental investigation was carried out to examine the jet impingement and spray cooling. There are three parts in this study. The first part was…
(more)
▼ An experimental investigation was carried out to examine the jet impingement and
spray cooling. There are three parts in this study. The first part was investigated the effects of jet impinging positions on heat transfer from rib-roughened (square and semi-circular) channels with rotational speeds of up to 600 rpm. Results were presented for rotating number (Ro), jet impinging position, surface roughness and jet Reynolds number effects on local Nusselt numbers. The second part was studied instantaneous velocity fields for a single slot liquid microjet using MPIV. The streamwise mean velocity fields and flow evolutions with six nozzle-to-target spacing ratios of 0.86, 1, 1.2, 1.5, 2 and 3 and for eight jet Reynolds numbers Re of 50, 100, 150, 200, 250, 300, 350 and 400 were measured and calculated. The third part was investigated the flow field and heat transfer mechanism for water
spray and cryogen (R-134a)
spray cooling. An optical image system was used to quantify the droplet size and distribution and Laser Doppler Velocimetry (LDV) measurements to obtain the local velocity distributions. The effects of mass flow rate and average droplet velocity, and
spray exit-to-target distance on the surface heat flux including the corresponding critical heat flux (CHF) were explored for R-134a which may enhance the current cryogen
spray cooling (CSC) technique that assists laser therapy of dermatoses.
Advisors/Committee Members: Chao-Kuang Chen (chair), Shou-Shing Hsieh (committee member), Chi-Hui Chien (chair), C.J. Ho (chair), Chin-Chia Su (chair), Ru Yang (chair), Ying-Huei Hung (chair), Peng-Sheng Wei (chair), Ming-Huei Yu (chair).
Subjects/Keywords: rotational; impingement cooling; CSC; spray cooling
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Manager
APA (6th Edition):
Tsai, H. (2006). An Experimental Study of Jet Impingement and Spray Cooling. (Doctoral Dissertation). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0720106-130031
Chicago Manual of Style (16th Edition):
Tsai, Huand-Hsiu. “An Experimental Study of Jet Impingement and Spray Cooling.” 2006. Doctoral Dissertation, NSYSU. Accessed August 17, 2019.
http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0720106-130031.
MLA Handbook (7th Edition):
Tsai, Huand-Hsiu. “An Experimental Study of Jet Impingement and Spray Cooling.” 2006. Web. 17 Aug 2019.
Vancouver:
Tsai H. An Experimental Study of Jet Impingement and Spray Cooling. [Internet] [Doctoral dissertation]. NSYSU; 2006. [cited 2019 Aug 17].
Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0720106-130031.
Council of Science Editors:
Tsai H. An Experimental Study of Jet Impingement and Spray Cooling. [Doctoral Dissertation]. NSYSU; 2006. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0720106-130031
NSYSU
12.
Lu, Chin-Yuan.
Design and Performance Analysis of a Miniature Spray Cooling System.
Degree: Master, Mechanical and Electro-Mechanical Engineering, 2012, NSYSU
URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0827112-210757
► The aim of this study is to design and build a miniature spray cooling system, in which the manufactured and adopted chamber, pump and heat…
(more)
▼ The aim of this study is to design and build a miniature
spray cooling system, in which the manufactured and adopted chamber, pump and heat exchanger are smaller than the conventional ones. An experiment was conducted to explore the
cooling performance of the
spray cooling system after its size has been minimized. In the experiment, copper was used to make the heated surface and different working media, such as DI water, as nanofludics with silver and multi-walled carbon nanotubes
powder were sprayed on the heated surface to enhance the heat dissipation efficiency of the system. The experiment in this study was set according to two conditions: transient and steady state, with Weber number as the main parameter, to observe the boiling phenomenon of different working media on heated surface and to record the temperature changes of the heated surface. The results were shown in boiling curve and
cooling curve. The ultimate goal of this study was to obtain a better understanding of the
cooling performance of the miniature
spray cooling system in order to apply it to micro-electronic
cooling devices, thereby solving the problem of the sharp increase in heating power per unit area on electronic components.
Advisors/Committee Members: Chin-Chia Su (chair), Ching-Jenq Ho (chair), Shou-Shing Hsieh (committee member), Chao-Kuang Chen (chair).
Subjects/Keywords: Miniature spray cooling system; Nanofludics; Boiling curve; Cooling curve; Critical heat flux
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APA ·
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Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Lu, C. (2012). Design and Performance Analysis of a Miniature Spray Cooling System. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0827112-210757
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Lu, Chin-Yuan. “Design and Performance Analysis of a Miniature Spray Cooling System.” 2012. Thesis, NSYSU. Accessed August 17, 2019.
http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0827112-210757.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Lu, Chin-Yuan. “Design and Performance Analysis of a Miniature Spray Cooling System.” 2012. Web. 17 Aug 2019.
Vancouver:
Lu C. Design and Performance Analysis of a Miniature Spray Cooling System. [Internet] [Thesis]. NSYSU; 2012. [cited 2019 Aug 17].
Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0827112-210757.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Lu C. Design and Performance Analysis of a Miniature Spray Cooling System. [Thesis]. NSYSU; 2012. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0827112-210757
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of North Texas
13.
Yaddanapudi, Satvik Janardhan.
Spray Cooling with HFC-134a and HFO-1234yf for Thermal Management of Automotive Power Electronics.
Degree: 2015, University of North Texas
URL: https://digital.library.unt.edu/ark:/67531/metadc822762/
► This study aims to experimentally investigate the spray cooling characteristics for active two-phase cooling of automotive power electronics. Tests are conducted on a small-scale, closed…
(more)
▼ This study aims to experimentally investigate the
spray cooling characteristics for active two-phase
cooling of automotive power electronics. Tests are conducted on a small-scale, closed loop
spray cooling system featuring a pressure atomized
spray nozzle. Two types of refrigerants, HFC-134a (R-134a) and HFO-1234yf, are selected as the working fluids. The test section (heater), made out of oxygen-free copper, has a 1-cm2 plain, smooth surface prepared following a consistent procedure, and would serve as a baseline case. Matching size thick film resistors, attached onto the copper heaters, generate heat and simulate high heat flux power electronics devices. The tests are conducted by controlling the heat flux in increasing steps, and recording the corresponding steady-state temperatures to obtain
cooling curves. The working fluid is kept at room temperature level (22 °C). Performance comparisons are made based on heat transfer coefficient (HTC) and critical heat flux (CHF) values. Effects of
spray characteristics and liquid flow rates on the
cooling performance are investigated with the selected coolants. Three types of commercially available nozzles that generate full-cone sprays with fine droplets are utilized in the tests. Effect of liquid flow rate is evaluated varying flow rates at 2, 3, 4 ml/s. The experimental results obtained from this study provide a framework for
spray cooling performance with the current and next-generation refrigerants aimed for advanced thermal management of automotive power electronics.
Advisors/Committee Members: Bostanci, Huseyin, Nasrazadani, Seifollah, 1956-, Yu, Cheng.
Subjects/Keywords: thermal management; power electronics; spray cooling; heat transfer; Automobiles – Electronic equipment – Cooling.; Spraying.
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Queens University
14.
Armitage, Grant.
An Experimental and Numerical Investigation of Evaporative Spray Cooling for a 45 degree Bend near a Gas Turbine Exhaust
.
Degree: Mechanical and Materials Engineering, 2014, Queens University
URL: http://hdl.handle.net/1974/8541
► The research performed in this work investigated evaporative spray cooling systems using water near a 45 degree bends in gas turbine exhaust piping systems. Both…
(more)
▼ The research performed in this work investigated evaporative spray cooling systems using water near a 45 degree bends in gas turbine exhaust piping systems. Both experimental data and numerical data were generated with the goal of evaluating the ability of Fluent 6.3.26 to predict the performance of these systems for the purpose of design using only modest computational resources. Three cases were investigated in this research: single phase exhaust flow with no water injection, injecting water before the bend and injecting water after the bend. Various probes were used to measure dry bulb temperature, total pressure and water mass flux of the two phase flow at the exit of the pipe. Seven hole probes and pitot static probes were used to measure single phase flow properties.
Numerical simulations were performed using mass flow boundary conditions which were generated from experimental results. A turbulence model was selected for the simulations based on comparisons of single phase simulations with experimental data and convergence ability. Using Fluent’s discrete phase model, different wall boundary conditions for the discrete phase were used in order to find the model which would best match the evaporation rates of the experimental data. Mass flux values through the exit plane of the pipe were found to be the most reliable of all the two phase data collected.
Results from numerical simulations revealed the shortcomings of the available discrete phase wall boundary conditions to accurately predict the interaction of the liquid phase with the wall. Experimental results for both cases showed extensive areas of the wall which had liquid film layers running down the length of the pipe. Simulations resulted in particles either failing to impact the wall and create a liquid film, or creating a liquid film which was much smaller than the film present in experimental results. This led to 8% and 15% discrepancy in evaporation
amounts between numerical and experimental results for water injection upstream and downstream of the bend respectively. Under-prediction of areas wetted with a wall film in the simulations also led to gross over predictions of wall temperature in numerical results.
Subjects/Keywords: Computational vs Experimental;
spray cooling;
exhaust bend;
gas turbine exhaust;
evaporative cooling;
CFD
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APA (6th Edition):
Armitage, G. (2014). An Experimental and Numerical Investigation of Evaporative Spray Cooling for a 45 degree Bend near a Gas Turbine Exhaust
. (Thesis). Queens University. Retrieved from http://hdl.handle.net/1974/8541
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Armitage, Grant. “An Experimental and Numerical Investigation of Evaporative Spray Cooling for a 45 degree Bend near a Gas Turbine Exhaust
.” 2014. Thesis, Queens University. Accessed August 17, 2019.
http://hdl.handle.net/1974/8541.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Armitage, Grant. “An Experimental and Numerical Investigation of Evaporative Spray Cooling for a 45 degree Bend near a Gas Turbine Exhaust
.” 2014. Web. 17 Aug 2019.
Vancouver:
Armitage G. An Experimental and Numerical Investigation of Evaporative Spray Cooling for a 45 degree Bend near a Gas Turbine Exhaust
. [Internet] [Thesis]. Queens University; 2014. [cited 2019 Aug 17].
Available from: http://hdl.handle.net/1974/8541.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Armitage G. An Experimental and Numerical Investigation of Evaporative Spray Cooling for a 45 degree Bend near a Gas Turbine Exhaust
. [Thesis]. Queens University; 2014. Available from: http://hdl.handle.net/1974/8541
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Texas A&M University
15.
Zhang, Taolue.
Study of Hydrodynamics and Heat Transfer Induced by Multiple Droplet Train Impingements.
Degree: 2017, Texas A&M University
URL: http://hdl.handle.net/1969.1/161290
► Recently, spray cooling heat transfer has received considerable attention due to its ability to dissipate high thermal loads. However, the physical mechanisms of spray cooling…
(more)
▼ Recently,
spray cooling heat transfer has received considerable attention due to its ability to dissipate high thermal loads. However, the physical mechanisms of
spray cooling remain not well-understood due to the complexity of sprays. In order to better understand the underlying physical mechanisms found in
spray cooling, a number of studies have been conducted by isolating
spray parameters and focusing on well-controlled droplet train impingement
cooling schemes. Most of the previous droplet train impingement studies have mainly focused on the thermal performance of single, double and collinearly arranged triple droplet train impingement. In the current study, the heat transfer and hydrodynamic characteristics of various droplet train impingement arrays have been investigated experimentally.
A piezo-electric droplet generation system has been designed and constructed, which is capable of producing well-controlled droplet trains arranged in various patterns (single, double, triangulated and hexagonal-arranged droplet trains). A translucent sapphire substrate, which was coated with a thin film ITO (Indium Tin Oxide), has been used as a heater in experiments. Well-calibrated high speed optical camera and IR thermal camera have been used to characterize the hydrodynamics and heat transfer of droplet train impingement.
Droplet-induced crown propagation dynamics has been analyzed experimentally. A revised crown propagation model was proposed in the current study, which is capable of predicting the crown base diameter as a function of time. A transition from crown spreading to splashing has been observed by increasing droplet Weber number. Heat transfer measurements show that strong splashing was unfavorable for heat transfer due to the instability of the liquid film. For multiple droplet train impingement, it was found that impact spacing and impingement pattern play significant roles in terms of heat transfer performance. Furthermore, empirical heat transfer correlations have been postulated and fitted using experimental data for various impingement patterns. Results indicate that the postulated correlations are in good agreement with experimental data. Comparisons have been made between droplet train impingement and circular jet impingement for various impingement patterns. It has been found that droplet train impingement leads to much better heat transfer performance than circular jet impingement due to the effective mixing of fluid during droplet impingement process. In summary, the effects of droplet Weber number, impact spacing and impingement pattern on heat transfer and hydrodynamics during droplet train impingement have been explored and elucidated.
Advisors/Committee Members: Alvarado, Jorge L (advisor), Sadr, Reza (advisor), Lau, Sai-Chuen (committee member), Hassan, Yassin A (committee member), Pate, Michael (committee member).
Subjects/Keywords: Droplet impingement cooling; Spray cooling; Droplet impingement dynamics; Jet impingement cooling; IR thermal Imaging; High speed imaging; Weber number
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APA (6th Edition):
Zhang, T. (2017). Study of Hydrodynamics and Heat Transfer Induced by Multiple Droplet Train Impingements. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/161290
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Zhang, Taolue. “Study of Hydrodynamics and Heat Transfer Induced by Multiple Droplet Train Impingements.” 2017. Thesis, Texas A&M University. Accessed August 17, 2019.
http://hdl.handle.net/1969.1/161290.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Zhang, Taolue. “Study of Hydrodynamics and Heat Transfer Induced by Multiple Droplet Train Impingements.” 2017. Web. 17 Aug 2019.
Vancouver:
Zhang T. Study of Hydrodynamics and Heat Transfer Induced by Multiple Droplet Train Impingements. [Internet] [Thesis]. Texas A&M University; 2017. [cited 2019 Aug 17].
Available from: http://hdl.handle.net/1969.1/161290.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Zhang T. Study of Hydrodynamics and Heat Transfer Induced by Multiple Droplet Train Impingements. [Thesis]. Texas A&M University; 2017. Available from: http://hdl.handle.net/1969.1/161290
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
16.
Victor Figueiredo Roriz.
Refrigeração evaporativa por aspersão em telhas de fibrocimento: estudo teórico e experimental.
Degree: 2007, Universidade Federal de São Carlos
URL: http://www.bdtd.ufscar.br/htdocs/tedeSimplificado//tde_busca/arquivo.php?codArquivo=1765
► Esta pesquisa enfoca a refrigeração evaporativa por aspersão de água sobre telhas onduladas de fibrocimento, na cidade de São Carlos, SP, visando sua utilização para…
(more)
▼ Esta pesquisa enfoca a refrigeração evaporativa por aspersão de água sobre telhas onduladas de fibrocimento, na cidade de São Carlos, SP, visando sua utilização para redução dos ganhos de calor em edificações. Um modelo teórico foi desenvolvido, baseado em equações clássicas da mecânica dos fluidos, aplicadas em cálculos iterativos dos fluxos de calor sobre a superfície superior da telha, considerada como superfície de controle. No desenvolvimento do trabalho, este modelo foi progressivamente ajustado a dados experimentais obtidos em uma célula de teste, exposta às condições climáticas locais, sendo monitoradas temperaturas superficiais de ambas as faces em duas telhas, uma mantida seca e outra sob aspersão intermitente de água. Os resultados da pesquisa indicaram que, apesar de ainda ser passível de aprimoramento, o modelo teórico já apresenta aproximação bastante satisfatória com os dados medidos. Aplicando-se um ajuste estatístico ao modelo proposto de cálculo iterativo dos fluxos de calor, obteve-se um coeficiente de correlação entre temperaturas medidas e estimadas de 0,999 e um desvio padrão de 0,35 C. Durante os experimentos, o fluxo médio de calor por evaporação foi de 409 W/m2. O volume médio de água evaporado foi de 0,7 l/(m.h), correspondendo a uma diferença média de temperaturas entre as telhas comparadas, para o período diurno, de 5,12 K. Frente à crescente necessidade de redução de consumo de energia, esta parece uma boa opção para redução da carga térmica dos edifícios, se comparada aos sistemas convencionais de condicionamento de ar
This research focuses the evaporative cooling by water aspersion on wavy cement fiber tiles in the city of São Carlos, SP, seeking to use it to reduce the buildings heat gains. A theoretical model was developed, based on classic equations of fluids mechanic, applied to iterative calculations of heat flows on the tile superior surface, considered as control surface. In the work development, this model was progressively adjusted to experimental data obtained in a test cell, exposed to the local climatic conditions, with the monitoring of superficial temperatures of both faces in two tiles, one maintained dry and other under intermittent aspersion of water. The research results indicated that, despite of still being susceptible to improvement, the theoretical model already presents quite satisfactory approach with the measured data. Applying a statistical adjustment to the proposed model of iterative heat flows calculation, it was obtained a correlation coefficient between measured and estimated temperatures of 0,999 and a standard deviation of 0,35 C. During the experiments, the average evaporative heat flow was 409 W/m2. Theaverage water volume evaporated was 0,7 l/(m.h), corresponding to an average difference of temperatures among the compared tiles of 5,12 K, for the daylight period. Due to the growing need of energy consumption reduction, this procedure seems to be a good option to reduce buildings thermal load, if compared to conventional air conditioning systems
Advisors/Committee Members: Maurício Roriz.
Subjects/Keywords: Conforto térmico; Refrigeração evaporativa; Arquitetura bioclimática; CONSTRUCAO CIVIL; Evaporative Cooling; Passive Cooling Systems; Bioclimatic Architecture; Evaporative Heat Flow; Water Spray Cooling
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APA (6th Edition):
Roriz, V. F. (2007). Refrigeração evaporativa por aspersão em telhas de fibrocimento: estudo teórico e experimental. (Thesis). Universidade Federal de São Carlos. Retrieved from http://www.bdtd.ufscar.br/htdocs/tedeSimplificado//tde_busca/arquivo.php?codArquivo=1765
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Roriz, Victor Figueiredo. “Refrigeração evaporativa por aspersão em telhas de fibrocimento: estudo teórico e experimental.” 2007. Thesis, Universidade Federal de São Carlos. Accessed August 17, 2019.
http://www.bdtd.ufscar.br/htdocs/tedeSimplificado//tde_busca/arquivo.php?codArquivo=1765.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Roriz, Victor Figueiredo. “Refrigeração evaporativa por aspersão em telhas de fibrocimento: estudo teórico e experimental.” 2007. Web. 17 Aug 2019.
Vancouver:
Roriz VF. Refrigeração evaporativa por aspersão em telhas de fibrocimento: estudo teórico e experimental. [Internet] [Thesis]. Universidade Federal de São Carlos; 2007. [cited 2019 Aug 17].
Available from: http://www.bdtd.ufscar.br/htdocs/tedeSimplificado//tde_busca/arquivo.php?codArquivo=1765.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Roriz VF. Refrigeração evaporativa por aspersão em telhas de fibrocimento: estudo teórico e experimental. [Thesis]. Universidade Federal de São Carlos; 2007. Available from: http://www.bdtd.ufscar.br/htdocs/tedeSimplificado//tde_busca/arquivo.php?codArquivo=1765
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Universidade Estadual de Campinas
17.
Anaya Fernandez, Silvia Cristina, 1982-.
Produção e caracterização de micropartículas lipídicas obtidas por spray cooling compostas por cera de caranaúba, ácido oleico e lecitina na encapsulação de solução de glicose e glicose sólida
.
Degree: 2014, Universidade Estadual de Campinas
URL: http://repositorio.unicamp.br/jspui/handle/REPOSIP/255989
► Resumo: Apesar da facilidade da produção e da possibilidade de fabricação em escala industrial, as micropartículas lipídicas apresentam desvantagens como a baixa capacidade de encapsula-ção…
(more)
▼ Resumo: Apesar da facilidade da produção e da possibilidade de fabricação em escala industrial, as micropartículas lipídicas apresentam desvantagens como a baixa capacidade de encapsula-ção e a possibilidade de expulsão do material de recheio durante o armazenamento. Foram propostas micropartículas lipídicas contendo lipídios sólidos e líquidos como mate-riais de parede com o objetivo de minimizar a expulsão do material de recheio. Desta forma o presente trabalho teve como finalidade estudar a formação de microcápsulas lipídicas produzidas pelo processo
Spray Cooling, compostas por misturas, em diferentes proporções de ácido oleico, linolênico e cera de carnaúba como matriz, lecitina de soja como surfactante e solução de glicose e glicose sólida como materiais de recheio. O objetivo foi aumentar a eficiência de encapsulação, avaliando e verificando o efeito da composição e estrutura da matriz lipídica, testando o comportamento da partícula com a inclusão de um novo compo-nente na matriz lipídica como é a cera de carnaúba. Nas micropartículas foram avaliadas a morfologia de superfície e microestrutura por microscopia eletrônica de varredura, tamanho e distribuição de partícula, quantidade de glicose superficial (não encapsulada), eficiência de encapsulação e comportamento de liberação do recheio em solução aquosa. As micro-partículas apresentaram formas esféricas com paredes rugosas, os diâmetros médios situa-ram-se numa faixa de 36 e 58 µm. Os resultados de eficiência de encapsulação nas misturas com a glicose em solução encontraram-se numa faixa de 52 a 62%, e nas misturas contendo o recheio sólido os valores de eficiência de encapsulação situaram-se numa faixa de 54 a 66%. As maiores quantidades de glicose superficial foram encontradas nas formulações nas quais foram adicionadas quantidades de recheio sólido. A liberação do recheio foi avaliada a cada 30 minutos durante 2 horas, observando-se que nos primeiros 30 minutos, as formu-lações que continham a glicose sólida apresentaram valores acima de 86% (efeito burst), enquanto que a liberação do recheio nas misturas contendo a glicose em solução apresentou valores de 22 a 72%. Ao término desse período, nestas misturas foi observado que a libera-ção de recheio ocorreu progressivamente. A utilização da matriz lipídica nas formulações parece responsável pelos resultados, considerando que a adição do lipídio liquido à cera de carnaúba foi um fator determinante na modificação da cristalização da mistura lipídica pro-porcionando uma melhoria na eficiência de encapsulação destas partículas; Abstract: The manufacturing and large scale production of micro particles is easy; however these products show some disadvantages such as poor encapsulation and deficient core material expulsion during storage. To avoid this problem the use of nanostructured lipids have been proposed with the purpose of minimizing the expulsion of core material. This work was conducted to study the formation of lipid microcapsules, produced during
spray cooling, from mixtures which contained different…
Advisors/Committee Members: Grosso, Carlos Raimundo Ferreira, 1953- (advisor), Gonçalves, Lireny Aparecida Guaraldo (committee member), Soares, Ana Silvia Prata (committee member).
Subjects/Keywords: Micropartículas lípidicas;
Cera de carnauba;
Spray cooling;
Liberação controlada
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APA (6th Edition):
Anaya Fernandez, Silvia Cristina, 1. (2014). Produção e caracterização de micropartículas lipídicas obtidas por spray cooling compostas por cera de caranaúba, ácido oleico e lecitina na encapsulação de solução de glicose e glicose sólida
. (Thesis). Universidade Estadual de Campinas. Retrieved from http://repositorio.unicamp.br/jspui/handle/REPOSIP/255989
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Anaya Fernandez, Silvia Cristina, 1982-. “Produção e caracterização de micropartículas lipídicas obtidas por spray cooling compostas por cera de caranaúba, ácido oleico e lecitina na encapsulação de solução de glicose e glicose sólida
.” 2014. Thesis, Universidade Estadual de Campinas. Accessed August 17, 2019.
http://repositorio.unicamp.br/jspui/handle/REPOSIP/255989.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Anaya Fernandez, Silvia Cristina, 1982-. “Produção e caracterização de micropartículas lipídicas obtidas por spray cooling compostas por cera de caranaúba, ácido oleico e lecitina na encapsulação de solução de glicose e glicose sólida
.” 2014. Web. 17 Aug 2019.
Vancouver:
Anaya Fernandez, Silvia Cristina 1. Produção e caracterização de micropartículas lipídicas obtidas por spray cooling compostas por cera de caranaúba, ácido oleico e lecitina na encapsulação de solução de glicose e glicose sólida
. [Internet] [Thesis]. Universidade Estadual de Campinas; 2014. [cited 2019 Aug 17].
Available from: http://repositorio.unicamp.br/jspui/handle/REPOSIP/255989.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Anaya Fernandez, Silvia Cristina 1. Produção e caracterização de micropartículas lipídicas obtidas por spray cooling compostas por cera de caranaúba, ácido oleico e lecitina na encapsulação de solução de glicose e glicose sólida
. [Thesis]. Universidade Estadual de Campinas; 2014. Available from: http://repositorio.unicamp.br/jspui/handle/REPOSIP/255989
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Windsor
18.
Jafari, Masoumeh.
Analysis of heat transfer in spray cooling systems using
numerical simulations.
Degree: MA, Mechanical, Automotive, and Materials
Engineering, 2014, University of Windsor
URL: http://scholar.uwindsor.ca/etd/5028
► The impingement of sprays onto dry and wet walls and the associated heat transfer occurs in many engineering applications. These applications include internal combustion…
(more)
▼ The impingement of sprays onto dry
and wet walls and the associated heat transfer occurs in many
engineering applications. These applications include internal
combustion engines, gas turbines,
spray drying,
spray coating and
spray cooling. The fluid dynamics and heat transfer characteristics
of liquid films created by
spray impingement are very complex and
determining the underlying physics requires fundamental studies. In
this study, an efficient and practical approach is devised for
tackling many aspects of the
spray cooling process. The
computational fluid dynamics (CFD) methodology used here includes
numerous droplets and it is designed to predict the
spray-wall
impact outcome based on reliable correlations. Even though it is
not an exact representation of the interaction between the
spray
and the liquid layer due to computational considerations, it
provides an acceptable picture of the transport phenomena. The
STAR-CCM+ CFD code has been used to solve continuity, momentum, and
energy equations coupled with a Lagrangian-Eulerian solver capable
of simulating droplets as well as thin fluid film. The model is
validated against relevant experimental data available in the
literature and good agreement is observed for heat transfer
coefficient (HTC) values for cases involving
spray impact and fluid
film formation over a flat solid surface. The effect of mass flux
and
spray Reynolds number on the
spray behaviour has been studied.
The model is extended to predict the
cooling performance of sealed
cans containing hot liquids when the cans are cooled by the
impingement of
spray formed from a cold liquid. The CFD results are
compared with field data obtained at Heinz Canada, Leamington, ON.
The effect of the can rotational speed on the cool-down behaviour
is investigated. The results show that there is an optimum
rotational speed beyond which the heat transfer enhancement will
not be as significant. This research is the first study which
solves the transport phenomena of fluid and heat outside, through
and inside a sealed solid can containing a hot liquid while being
cooled by the
spray of a cold
liquid.
Advisors/Committee Members: Balachandar, Ramaswami, Barron, Ronald M..
Subjects/Keywords: Applied sciences; Heat transfer; Rotation; Spray cooling; Engineering; Mechanical Engineering
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APA ·
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APA (6th Edition):
Jafari, M. (2014). Analysis of heat transfer in spray cooling systems using
numerical simulations. (Masters Thesis). University of Windsor. Retrieved from http://scholar.uwindsor.ca/etd/5028
Chicago Manual of Style (16th Edition):
Jafari, Masoumeh. “Analysis of heat transfer in spray cooling systems using
numerical simulations.” 2014. Masters Thesis, University of Windsor. Accessed August 17, 2019.
http://scholar.uwindsor.ca/etd/5028.
MLA Handbook (7th Edition):
Jafari, Masoumeh. “Analysis of heat transfer in spray cooling systems using
numerical simulations.” 2014. Web. 17 Aug 2019.
Vancouver:
Jafari M. Analysis of heat transfer in spray cooling systems using
numerical simulations. [Internet] [Masters thesis]. University of Windsor; 2014. [cited 2019 Aug 17].
Available from: http://scholar.uwindsor.ca/etd/5028.
Council of Science Editors:
Jafari M. Analysis of heat transfer in spray cooling systems using
numerical simulations. [Masters Thesis]. University of Windsor; 2014. Available from: http://scholar.uwindsor.ca/etd/5028
NSYSU
19.
Chang, Wei-Che.
Thin Film Roughened Surface Effect On Spray Cooling Heat Transfer.
Degree: Master, Mechanical and Electro-Mechanical Engineering, 2017, NSYSU
URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0715117-093212
► The objective of this study was to investigate the effect of coated thin films (several nanometers thick) made from different materials on enhancing the cooling…
(more)
▼ The objective of this study was to investigate the effect of coated thin films (several nanometers thick) made from different materials on enhancing the
cooling performance of a
spray cooling system that contained a
spray nozzle with a mini piezoelectric piece. The roughness of the thin film surfaces increased the reaction areas as well as the number of nucleation sites (which formed bubbles during nucleate boiling), improving the boiling heat transfer performance of the
spray cooling system. For the study experiment, copper was used as the base of the test surfaces, which were coated with thin films made from different materials (i.e., graphene, multiwall carbon nanotubes (MCNT), and diamond-like carbon (DLC). Next, a porous piezoelectric
spray nozzle with an atomization piece, an aperture of 35µm, a mass flow rate of 5.33Ã10^(-4)kg/s, and a
spray height of 50 mm was used to
spray DI water as a working fluid on heated test surfaces, initiating the
spray cooling experiment. A T-type thermocouple was used to measure the resulting temperatures, after which related parameters such as test surface temperatures and heat transfer amounts were calculated. The related parameters were used to generate boiling and quench curves to analyze the effect of thin film surface roughness on the ability of
spray cooling to improve heat transfer properties.
Advisors/Committee Members: Chao-Kuang Chen (chair), Chi-Hui Chien (committee member), Shou-Shing Hsieh (committee member), Ching-Jenq Ho (chair).
Subjects/Keywords: Thin film surface; roughness; piezoelectric plate; spray cooling; boiling curves
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APA (6th Edition):
Chang, W. (2017). Thin Film Roughened Surface Effect On Spray Cooling Heat Transfer. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0715117-093212
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Chang, Wei-Che. “Thin Film Roughened Surface Effect On Spray Cooling Heat Transfer.” 2017. Thesis, NSYSU. Accessed August 17, 2019.
http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0715117-093212.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Chang, Wei-Che. “Thin Film Roughened Surface Effect On Spray Cooling Heat Transfer.” 2017. Web. 17 Aug 2019.
Vancouver:
Chang W. Thin Film Roughened Surface Effect On Spray Cooling Heat Transfer. [Internet] [Thesis]. NSYSU; 2017. [cited 2019 Aug 17].
Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0715117-093212.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Chang W. Thin Film Roughened Surface Effect On Spray Cooling Heat Transfer. [Thesis]. NSYSU; 2017. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0715117-093212
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Wright State University
20.
Michalak, Travis Edward.
The Effect of Variable Gravity on the Cooling Performance of
a Partially-Confined FC-72 Spray.
Degree: MSEgr, Mechanical Engineering, 2009, Wright State University
URL: http://rave.ohiolink.edu/etdc/view?acc_num=wright1245155890
► This thesis discusses the effects of a variable-gravity environment on the performance of a subcooled partially-confined spray. An experiment, consisting of a test chamber, the…
(more)
▼ This thesis discusses the effects of a
variable-gravity environment on the performance of a subcooled
partially-confined
spray. An experiment, consisting of a test
chamber, the associated flow loops, and instrumentation, was
fabricated and flown on the NASA Reduced-Gravity Testing Platform.
This modified KC-135 aircraft followed a parabolic flight path to
provide various acceleration levels. The
spray chamber contained
two opposing nozzles spraying onto Thick Film Resistor (TFR)
heaters, which were mounted on insulating glass pedestals. Only the
upward facing heater was used during this testing. Thermocouples
under the heater in the glass pedestal were used to determine the
heater surface temperature. The glass pedestals were surrounded by
an annular sump system, which was used to collect and remove the
cooling fluid from the test chamber. The fluid used for this
testing was FC-72, which is a non-toxic, non-flammable, and
non-reactive refrigerant. Due to its dielectric nature, FC-72 was
sprayed directly onto the electric thick film heaters. The
parametric ranges of this experiment were as follows: Heat flux to
the
spray, 21.1 = <i>q</i>¿
sp =
69.0 W/cm
2; acceleration field, 0.15 =
<i>a</i> = 1.80 g; coolant volumetric flow rate, 6.18 =
<i>V</i> = 8.94 ml/s; and coolant subcooling, 23.1 =
¿<i>T</i>
sc = 31.7 K. The heat
fluxes tested were below the critical heat flux
<i>q</i>¿
CHF. The wall superheat
¿<i>T</i>
sat =
<i>T</i>
s -
<i>T</i>
sat was found to
increase with heat input and acceleration, and decrease with
subcooling and volumetric flow rate.
Advisors/Committee Members: Thomas, Scott K. (Committee Chair).
Subjects/Keywords: Mechanical Engineering; spray cooling; acceleration; variable gravity; thermal management
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APA (6th Edition):
Michalak, T. E. (2009). The Effect of Variable Gravity on the Cooling Performance of
a Partially-Confined FC-72 Spray. (Masters Thesis). Wright State University. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=wright1245155890
Chicago Manual of Style (16th Edition):
Michalak, Travis Edward. “The Effect of Variable Gravity on the Cooling Performance of
a Partially-Confined FC-72 Spray.” 2009. Masters Thesis, Wright State University. Accessed August 17, 2019.
http://rave.ohiolink.edu/etdc/view?acc_num=wright1245155890.
MLA Handbook (7th Edition):
Michalak, Travis Edward. “The Effect of Variable Gravity on the Cooling Performance of
a Partially-Confined FC-72 Spray.” 2009. Web. 17 Aug 2019.
Vancouver:
Michalak TE. The Effect of Variable Gravity on the Cooling Performance of
a Partially-Confined FC-72 Spray. [Internet] [Masters thesis]. Wright State University; 2009. [cited 2019 Aug 17].
Available from: http://rave.ohiolink.edu/etdc/view?acc_num=wright1245155890.
Council of Science Editors:
Michalak TE. The Effect of Variable Gravity on the Cooling Performance of
a Partially-Confined FC-72 Spray. [Masters Thesis]. Wright State University; 2009. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=wright1245155890
NSYSU
21.
Li, Yi-Fang.
Analysis of Flow and Heat Transfer Characteristics of Spray Cooling with Dielectric Fluids Using Piezoelectric Atomizer.
Degree: Master, Mechanical and Electro-Mechanical Engineering, 2018, NSYSU
URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0101118-111804
► The purpose of this study is to analyze the flow and heat transfer characteristics of spray cooling with two dielectric fluids (HFE-7100 and HFE-7300) using…
(more)
▼ The purpose of this study is to analyze the flow and heat transfer characteristics of
spray cooling with two dielectric fluids (HFE-7100 and HFE-7300) using piezoelectric atomizer (dj = 35 μm) as a nozzle and ITO-coated glass as a heater. The main experimental parameters are
spray height (H = 10 mm, 20 mm, 30 mm, 40 mm) and heater surface temperature (Tw = 25â, 75â, 125â, 175â, 225â). For flow-field measurements, the droplet velocity is measured by μPIV and the droplet size is measured by IPI. The temperature measurements are obtained with T-type thermocouples. From the experimental data, the maximum velocity of two fluids is 7.61 m/s (HFE-7100) and 8.73 m/s (HFE-7300), and the velocity decreases along the downstream; the droplet size is about 11.83 μm ~ 17.66 μm (HFE-7100) and 12.32 μm ~ 18.27 μm (HFE-7300); the CHF of two fluids is 1.032 W/cm2 (HFE-7100) and 1.133 W/cm2 (HFE-7300) when
spray height is 10 mm.
Advisors/Committee Members: Mao-Yu Wen (chair), Ru Yang (committee member), Mei-Ling Wu (chair), Shou-Shing Hsieh (committee member).
Subjects/Keywords: IPI; piezoelectric atomizer; dielectric fluid; μPIV; Spray cooling
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APA (6th Edition):
Li, Y. (2018). Analysis of Flow and Heat Transfer Characteristics of Spray Cooling with Dielectric Fluids Using Piezoelectric Atomizer. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0101118-111804
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Li, Yi-Fang. “Analysis of Flow and Heat Transfer Characteristics of Spray Cooling with Dielectric Fluids Using Piezoelectric Atomizer.” 2018. Thesis, NSYSU. Accessed August 17, 2019.
http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0101118-111804.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Li, Yi-Fang. “Analysis of Flow and Heat Transfer Characteristics of Spray Cooling with Dielectric Fluids Using Piezoelectric Atomizer.” 2018. Web. 17 Aug 2019.
Vancouver:
Li Y. Analysis of Flow and Heat Transfer Characteristics of Spray Cooling with Dielectric Fluids Using Piezoelectric Atomizer. [Internet] [Thesis]. NSYSU; 2018. [cited 2019 Aug 17].
Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0101118-111804.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Li Y. Analysis of Flow and Heat Transfer Characteristics of Spray Cooling with Dielectric Fluids Using Piezoelectric Atomizer. [Thesis]. NSYSU; 2018. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0101118-111804
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Illinois – Chicago
22.
Sinha Ray, Suman.
Mechanics of Micro- and Nano-Textured Systems: Nanofibers, Nanochannels, Nanoparticles and Slurries.
Degree: 2012, University of Illinois – Chicago
URL: http://hdl.handle.net/10027/9610
► The first chapter of this work deals with bundles of microscopically long carbon nanochannels, which were assembled as a nanofluidic device to study bi-layer flows…
(more)
▼ The first chapter of this work deals with bundles of microscopically long carbon nanochannels, which were assembled as a nanofluidic device to study bi-layer flows of n-decane and air. These experiments were accompanied and supported by theoretical considerations. The study paradoxically showed that it is possible to deliver more liquid through the nanochannels if they are partially filled with liquid in comparison to those which are completely filled with liquid. In the following chapter these nanochannels were used to produce thermoresponsive nanoparticles (~400 nm in diameter) at a very high production rate of 107 particles/sec. These nanoparticles were loaded with a low molecular weight dye to study the thermoresponsive release profile experimentally. The experiments were accompanied and guided by theoretical work. In the third part of the work, a rigorous electron microscopy revealed the 2-nm islands of thermoresponsive hydrogels nanofibers produced by electrospinning and cross-linking of electropun PNIPAM-containing nanofibers. These islands were found to be responsible for positive thermosensitivity in dye release experiments.
In the following chapters meltblowing was studied both experimentally and theoretically. The role of air turbulence in this process was elucidated experimentally by blowing a solid flexible threadline in high-speed gas flow. Using this information, theoretical understanding of polymer jet/gas jet turbulent interactions was achieved and a theory of small (linearized)and large (nonlinear) bending perturbations of polymer jets was developed. This theory was extended to simulate numerically multiple polymer jets being deposited on a screen moving normally to the blowing direction.
In the subsequent chapter, a novel method, solution blowing, for producing monolithic and core-shell nanofibers was developed. The core-shell fibers were also converted into hollow carbon nanotubes. The carbon nanofiber mats produced by this method were used as an electrode in a microbial fuel cell, which showed a higher current density in comparison to standard polycrystalline graphite rods. In addition, solution blowing was used to form soy-protein-containing biodegradable nanofibers.
In the next chapter, a novel method of intercalating wax and butter en masse into carbon nanotubes was demonstrated. It was shown that by manipulating the intercalated solute the working temperature range of phase-change materials (PCM) can be significantly widened, while the response time reduced to minimum.
In the final part of the work the elongational rheology of gypsum slurries was also studied and corroborated using the data from the corresponding shear rheological studies. It was shown that the gypsum slurries approximately follow the tensorial Ostwald-de-Waele (power law) constitutive equation.
Advisors/Committee Members: Yarin, Alexander L (advisor).
Subjects/Keywords: Nanochannels; Nanoparticles; Nanofibers; Phase Change Materials; Spray Cooling; Gypsum Slurries.
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APA (6th Edition):
Sinha Ray, S. (2012). Mechanics of Micro- and Nano-Textured Systems: Nanofibers, Nanochannels, Nanoparticles and Slurries. (Thesis). University of Illinois – Chicago. Retrieved from http://hdl.handle.net/10027/9610
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Sinha Ray, Suman. “Mechanics of Micro- and Nano-Textured Systems: Nanofibers, Nanochannels, Nanoparticles and Slurries.” 2012. Thesis, University of Illinois – Chicago. Accessed August 17, 2019.
http://hdl.handle.net/10027/9610.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Sinha Ray, Suman. “Mechanics of Micro- and Nano-Textured Systems: Nanofibers, Nanochannels, Nanoparticles and Slurries.” 2012. Web. 17 Aug 2019.
Vancouver:
Sinha Ray S. Mechanics of Micro- and Nano-Textured Systems: Nanofibers, Nanochannels, Nanoparticles and Slurries. [Internet] [Thesis]. University of Illinois – Chicago; 2012. [cited 2019 Aug 17].
Available from: http://hdl.handle.net/10027/9610.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Sinha Ray S. Mechanics of Micro- and Nano-Textured Systems: Nanofibers, Nanochannels, Nanoparticles and Slurries. [Thesis]. University of Illinois – Chicago; 2012. Available from: http://hdl.handle.net/10027/9610
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Universidade Estadual de Campinas
23.
Pilarski, Emmanuelle, 1979-.
Obtenção de micropartículas lipídicas contendo bicarbonato de sódio por spray cooling e de bicarbonato de sódio aglomerado por melt agglomeration em leito vibrofluidizado
.
Degree: 2012, Universidade Estadual de Campinas
URL: http://repositorio.unicamp.br/jspui/handle/REPOSIP/256349
► Resumo: O presente trabalho teve como objetivo o desenvolvimento de (i) micropartículas lipídicas contendo bicarbonato de sódio pelo processo de spray cooling e de (ii)…
(more)
▼ Resumo: O presente trabalho teve como objetivo o desenvolvimento de (i) micropartículas lipídicas contendo bicarbonato de sódio pelo processo de
spray cooling e de (ii) aglomerados de bicarbonato de sódio, utilizando-se do processo de melt agglomeration em leito vibrofluidizado. Essas tecnologias foram aplicadas com o intuito de melhorar a estabilidade desse material, uma vez que o mesmo se decompõe na presença de umidade/ou temperaturas mais elevadas. Uma mistura lipídica composta por gordura de palma totalmente hidrogenada (GPTH) e óleo de palma refinado (OP) foi empregada como material de parede/ligante que atendeu ao requisito de ponto de fusão de 55 ºC, com a proporção de 57,5 e 42,5 %, respectivamente. No processo de
spray cooling, foi realizado um Delineamento Composto Central Rotacional (DCCR), com 11 ensaios, para cada um dos três diâmetros de abertura de bico atomizador estudados (??igual a 1,0; 1,2 e 1,5 mm), totalizando 33 experimentos, a fim de se avaliar o efeito da temperatura de entrada da dispersão (Te) (65 a 85 ºC) e da pressão de atomização (Pat) (1,0 a 2,0 kgf/cm2) sobre as seguintes variáveis dependentes: (i) eficiência de microencapsulação (EM, % de CO2), (ii), quantidade de bicarbonato de sódio superficial (BSS, % de CO2) e (iii) rendimento (R, em %). As micropartículas apresentaram formato esférico e estrutura de superfície irregular para os ensaios realizados. A análise estatística dos resultados mostrou que para ??= 1,0 mm, um aumento nos níveis da Te e da Pat ocasionou um decréscimo da EM; para o ??= 1,2 mm, o aumento da Te ocasionou uma melhoria nessa resposta, entretanto, a Pat quando aumentada acarretou na sua diminuição. Para o ??= 1,5 mm, essas duas variáveis apresentaram menores efeitos, onde o aumento da Pat favoreceu a EM e o aumento da Te, a sua diminuição. A Te exerceu efeito positivo no R para o ??= 1,0 mm, sem influência nessa resposta para os diâmetros 1,2 e 1,5 mm, enquanto que a Pat teve efeito positivo para ??igual a 1,0 e 1,5 mm (termo linear) e negativo para o termo quadrático deste último. Pela combinação das respostas obtidas, verificou-se que o ensaio 4, diâmetro de bico atomizador (??= 1,5 mm), altas temperatura de entrada e de pressão de atomização (Te = 82 ºC e Pat = 1,85 kgf/cm2) apresentou o melhor desempenho (eficiência 3,18 %; quantidade de bicarbonato de sódio superficial 0,17 % e rendimento 80,0 %) quando comparado com os outros diâmetros de abertura. No processamento em leito vibrofluidizado, foi realizado um DCCR, totalizando 17 ensaios, com o objetivo de avaliar o efeito das variáveis: (i) pressão de atomização (5,0 a 15,0 Psig), (ii) frequência de vibração (186 a 354 rpm) e (iii) amplitude de vibração (0,40 a 2,00 cm), sobre as variáveis dependentes (i): rendimento R (%), (ii) eficiência da aglomeração Eagl (% CO2), para as frações granulométricas de 300, 600 e 840 µm, (iii) crescimento de partícula C3,3 (%) e (iv) índice de torrões Itor (%). O material aglomerado apresentou ampla distribuição de tamanho e a nucleação dos aglomerados ocorreu pelo mecanismo…
Advisors/Committee Members: Collares-Queiroz, Fernanda Paula, 1966- (advisor), Queiroz, Fernanda Paula Collares (advisor), Rocha, Sandra Cristina dos Santos, 1957- (advisor), Grosso, Carlos Raimundo Ferreira (committee member), Nabeshima, Elizabeth Harumi (committee member), Alvim, Izabel Dutra (committee member), Grimaldi, Renato (committee member).
Subjects/Keywords: Bicarbonato de sódio;
Microencapsulação;
Spray cooling;
Leito fluidizado;
Aglomeração
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APA ·
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APA (6th Edition):
Pilarski, Emmanuelle, 1. (2012). Obtenção de micropartículas lipídicas contendo bicarbonato de sódio por spray cooling e de bicarbonato de sódio aglomerado por melt agglomeration em leito vibrofluidizado
. (Thesis). Universidade Estadual de Campinas. Retrieved from http://repositorio.unicamp.br/jspui/handle/REPOSIP/256349
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Pilarski, Emmanuelle, 1979-. “Obtenção de micropartículas lipídicas contendo bicarbonato de sódio por spray cooling e de bicarbonato de sódio aglomerado por melt agglomeration em leito vibrofluidizado
.” 2012. Thesis, Universidade Estadual de Campinas. Accessed August 17, 2019.
http://repositorio.unicamp.br/jspui/handle/REPOSIP/256349.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Pilarski, Emmanuelle, 1979-. “Obtenção de micropartículas lipídicas contendo bicarbonato de sódio por spray cooling e de bicarbonato de sódio aglomerado por melt agglomeration em leito vibrofluidizado
.” 2012. Web. 17 Aug 2019.
Vancouver:
Pilarski, Emmanuelle 1. Obtenção de micropartículas lipídicas contendo bicarbonato de sódio por spray cooling e de bicarbonato de sódio aglomerado por melt agglomeration em leito vibrofluidizado
. [Internet] [Thesis]. Universidade Estadual de Campinas; 2012. [cited 2019 Aug 17].
Available from: http://repositorio.unicamp.br/jspui/handle/REPOSIP/256349.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Pilarski, Emmanuelle 1. Obtenção de micropartículas lipídicas contendo bicarbonato de sódio por spray cooling e de bicarbonato de sódio aglomerado por melt agglomeration em leito vibrofluidizado
. [Thesis]. Universidade Estadual de Campinas; 2012. Available from: http://repositorio.unicamp.br/jspui/handle/REPOSIP/256349
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
NSYSU
24.
Lin, Jhen.
Analysis of Flow Field and Heat Transfer Characteristics of Spray Cooling through A Twin-fluid Nozzle.
Degree: Master, Mechanical and Electro-Mechanical Engineering, 2018, NSYSU
URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0715118-082448
► This experiment mainly discusses the twin-fluid nozzle with the diameter of 1.6 mm by changing different experimental parameters, such as the spray height (H=40 mm,…
(more)
▼ This experiment mainly discusses the twin-fluid nozzle with the diameter of 1.6 mm by changing different experimental parameters, such as the
spray height (H=40 mm, 50 mm, 60 mm), the mass ratio of air to liquid (R = 0.145, 0.194, 0.242, 0.259 , 0.323) and the surface temperature (Tw = 25 °C, 75 °C, 125 °C) to observe the flow field and temperature field.
In the experiment, the heater system consisted of the copper block and heating rods, DI water is used as the working fluid. The velocity distribution is observed by μPIV and the dimension of the particle is observed by IPI; the temperature field measurements, using the thermocouple (K-Type) for the
cooling experiment, calculate and analysis to obtain the optimal critical heat flux (CHF).
The experimental results show the optimal critical heat flux and the smallest particle size occurs when the
spray height of 50 mm and the gas-liquid ratio of 0.242.
Advisors/Committee Members: Ru Yang (committee member), Chao-Kuang Chen (chair), Shou-Shing Hsieh (committee member), C.J. Ho (chair).
Subjects/Keywords: Twin-fluid nozzle; Spray cooling; Critical heat flux; μPIV; IPI
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APA ·
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APA (6th Edition):
Lin, J. (2018). Analysis of Flow Field and Heat Transfer Characteristics of Spray Cooling through A Twin-fluid Nozzle. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0715118-082448
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Lin, Jhen. “Analysis of Flow Field and Heat Transfer Characteristics of Spray Cooling through A Twin-fluid Nozzle.” 2018. Thesis, NSYSU. Accessed August 17, 2019.
http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0715118-082448.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Lin, Jhen. “Analysis of Flow Field and Heat Transfer Characteristics of Spray Cooling through A Twin-fluid Nozzle.” 2018. Web. 17 Aug 2019.
Vancouver:
Lin J. Analysis of Flow Field and Heat Transfer Characteristics of Spray Cooling through A Twin-fluid Nozzle. [Internet] [Thesis]. NSYSU; 2018. [cited 2019 Aug 17].
Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0715118-082448.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Lin J. Analysis of Flow Field and Heat Transfer Characteristics of Spray Cooling through A Twin-fluid Nozzle. [Thesis]. NSYSU; 2018. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0715118-082448
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
25.
Jafari, Masoumeh.
Analysis of heat transfer in spray cooling systems using numerical simulations.
Degree: MA, Mechanical, Automotive, and Materials Engineering, 2014, University of Windsor
URL: https://scholar.uwindsor.ca/etd/5028
► The impingement of sprays onto dry and wet walls and the associated heat transfer occurs in many engineering applications. These applications include internal combustion…
(more)
▼ The impingement of sprays onto dry and wet walls and the associated heat transfer occurs in many engineering applications. These applications include internal combustion engines, gas turbines,
spray drying,
spray coating and
spray cooling. The fluid dynamics and heat transfer characteristics of liquid films created by
spray impingement are very complex and determining the underlying physics requires fundamental studies. In this study, an efficient and practical approach is devised for tackling many aspects of the
spray cooling process. The computational fluid dynamics (CFD) methodology used here includes numerous droplets and it is designed to predict the
spray-wall impact outcome based on reliable correlations. Even though it is not an exact representation of the interaction between the
spray and the liquid layer due to computational considerations, it provides an acceptable picture of the transport phenomena. The STAR-CCM+ CFD code has been used to solve continuity, momentum, and energy equations coupled with a Lagrangian-Eulerian solver capable of simulating droplets as well as thin fluid film. The model is validated against relevant experimental data available in the literature and good agreement is observed for heat transfer coefficient (HTC) values for cases involving
spray impact and fluid film formation over a flat solid surface. The effect of mass flux and
spray Reynolds number on the
spray behaviour has been studied. The model is extended to predict the
cooling performance of sealed cans containing hot liquids when the cans are cooled by the impingement of
spray formed from a cold liquid. The CFD results are compared with field data obtained at Heinz Canada, Leamington, ON. The effect of the can rotational speed on the cool-down behaviour is investigated. The results show that there is an optimum rotational speed beyond which the heat transfer enhancement will not be as significant. This research is the first study which solves the transport phenomena of fluid and heat outside, through and inside a sealed solid can containing a hot liquid while being cooled by the
spray of a cold liquid.
Advisors/Committee Members: Balachandar, Ramaswami, Barron, Ronald M..
Subjects/Keywords: Applied sciences; Heat transfer; Rotation; Spray cooling; Engineering; Mechanical Engineering
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APA (6th Edition):
Jafari, M. (2014). Analysis of heat transfer in spray cooling systems using numerical simulations. (Masters Thesis). University of Windsor. Retrieved from https://scholar.uwindsor.ca/etd/5028
Chicago Manual of Style (16th Edition):
Jafari, Masoumeh. “Analysis of heat transfer in spray cooling systems using numerical simulations.” 2014. Masters Thesis, University of Windsor. Accessed August 17, 2019.
https://scholar.uwindsor.ca/etd/5028.
MLA Handbook (7th Edition):
Jafari, Masoumeh. “Analysis of heat transfer in spray cooling systems using numerical simulations.” 2014. Web. 17 Aug 2019.
Vancouver:
Jafari M. Analysis of heat transfer in spray cooling systems using numerical simulations. [Internet] [Masters thesis]. University of Windsor; 2014. [cited 2019 Aug 17].
Available from: https://scholar.uwindsor.ca/etd/5028.
Council of Science Editors:
Jafari M. Analysis of heat transfer in spray cooling systems using numerical simulations. [Masters Thesis]. University of Windsor; 2014. Available from: https://scholar.uwindsor.ca/etd/5028
University of Illinois – Urbana-Champaign
26.
Zhang, Feini.
Experimental study of the thermal-hydraulic performance of a brazed aluminum heat exchanger under wet-surface conditions.
Degree: MS, 0133, 2012, University of Illinois – Urbana-Champaign
URL: http://hdl.handle.net/2142/31930
► Using an open-loop wind tunnel and a full-cone water spray nuzzle, the air-side performance of a liquid-to-air heat exchanger is studied experimentally for wet-surface conditions.…
(more)
▼ Using an open-loop wind tunnel and a full-cone water
spray nuzzle, the air-side performance of a liquid-to-air heat exchanger is studied experimentally for wet-surface conditions. The test specimen is a brazed-aluminum, louvered-fin heat exchanger. The total capacity, pressure drop and water drainage behavior under various water usage rates and air face velocities are explored and compared to data from dry-surface conditions. The impact of
spray orientation is also studied. The results are presented as plots against water usage rate or water
spray rate per unit heat transfer area. The experimental data are used to validate a model developed for simultaneous heat and mass transfer of a wetted heat exchanger. Fouling on the fin surface is observed in the experiment, and fouling characteristics are discussed in this thesis.
Advisors/Committee Members: Jacobi, Anthony M. (advisor).
Subjects/Keywords: evaporative cooling; spray; louver-fin heat exchanger; wet surface; fouling; experiment
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APA ·
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Manager
APA (6th Edition):
Zhang, F. (2012). Experimental study of the thermal-hydraulic performance of a brazed aluminum heat exchanger under wet-surface conditions. (Thesis). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/31930
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Zhang, Feini. “Experimental study of the thermal-hydraulic performance of a brazed aluminum heat exchanger under wet-surface conditions.” 2012. Thesis, University of Illinois – Urbana-Champaign. Accessed August 17, 2019.
http://hdl.handle.net/2142/31930.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Zhang, Feini. “Experimental study of the thermal-hydraulic performance of a brazed aluminum heat exchanger under wet-surface conditions.” 2012. Web. 17 Aug 2019.
Vancouver:
Zhang F. Experimental study of the thermal-hydraulic performance of a brazed aluminum heat exchanger under wet-surface conditions. [Internet] [Thesis]. University of Illinois – Urbana-Champaign; 2012. [cited 2019 Aug 17].
Available from: http://hdl.handle.net/2142/31930.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Zhang F. Experimental study of the thermal-hydraulic performance of a brazed aluminum heat exchanger under wet-surface conditions. [Thesis]. University of Illinois – Urbana-Champaign; 2012. Available from: http://hdl.handle.net/2142/31930
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Universidade Estadual de Campinas
27.
Santos, Camilia Aoyagui dos, 1984-.
Obten??o e caracteriza??o de sementes de cristaliza??o a base de "hardfat" adicionado de D-limoneno ou ?leo de canola e aplica??o em chocolate : avalia??o dos efeitos tecnol?gicos
.
Degree: 2018, Universidade Estadual de Campinas
URL: http://repositorio.unicamp.br/jspui/handle/REPOSIP/333789
► Resumo: Entre as t?cnicas utilizadas para promover e direcionar a cristaliza??o de sistemas lip?dicos est? a semeadura (seeding). Tal t?cnica consiste na adi??o de material…
(more)
▼ Resumo: Entre as t?cnicas utilizadas para promover e direcionar a cristaliza??o de sistemas lip?dicos est? a semeadura (seeding). Tal t?cnica consiste na adi??o de material lip?dico cristalino (sementes de cristaliza??o), que atua como agente de nuclea??o ou superf?cie cristalina para o crescimento dos cristais, al?m de induzir h?bito polim?rfico espec?fico. O presente estudo visou a obten??o de sementes de cristaliza??o ?-est?veis por sistema de "
spray cooling", para acelerar ou eliminar a etapa de pr?-cristaliza??o de chocolate do tipo amargo. Para a produ??o das micropart?culas lip?dicas s?lidas (SLMs), foi empregada uma mat?ria-prima de baixo custo industrial - o "hardfat" de ?leo de soja (HS). Para a obten??o de SLMs de HS no polimorfismo de maior estabilidade, ?, foram adicionados D-limoneno (5%) ou ?leo de canola (7,5%), os quais permitiram a obten??o de SLMs com geometria esf?rica, di?metros m?dios (D50) entre 150 e 200 ?m e polimorfismo ? ap?s apenas 18 horas de armazenamento a 25?C. N?o houve aglomera??o das SLMs durante armazenamento realizado a 25?C por at? 30 dias, monitorado atrav?s das an?lises de microscopia eletr?nica de varredura (MEV). A aplica??o dessas SLMs em chocolate amargo propiciou redu??o em 32% do tempo da etapa de pr?-cristaliza??o, representando ganho em produtividade. No teste de vida de prateleira acelerado (20?C/12 horas e 32?C/12 horas), as semeaduras demonstraram n?o retardar nem acelerar o surgimento do fat bloom no chocolate. Os valores de D90 (di?metro de 90% das part?culas do chocolate) de todas as amostras se apresentaram dentro da faixa considerada ideal (< 35 ?m) para chocolate amargo. Os chocolates foram avaliados sensorialmente (teste de aceitabilidade com 146 avaliadores) resultando em ?tima aceitabilidade nos atributos textura, apar?ncia, sabor, aroma e impress?o global. Em fun??o dos resultados obtidos, a incorpora??o das sementes de cristaliza??o ?-est?veis em chocolate amargo p?de ser considerada bem-sucedida. A aplica??o das sementes de cristaliza??o obtidas em outros sistemas lip?dicos pode ser explorada, possibilitando ricas oportunidades de estudos; Abstract: Among the techniques used to promote and direct the crystallization of lipid systems are seeding. Such technique consists in the addition of crystalline lipid material (seed crystals), which acts as nucleating agent or crystalline surface for crystal growth, besides inducing specific polymorphic habit. The present study aimed to obtain ?-stable crystal seeds by "
spray cooling" system, to accelerate or eliminate the pre-crystallization stage of dark chocolate. For the production of solid lipid microparticles (SLMs), a low cost industrial raw material was used - the soybean oil hardfat (HS). D-limonene (5%) or canola oil (7.5%) were added to obtain SLMs of HS in the polymorphism of higher stability, ?, which allowed to obtain SLMs with spherical geometry, mean diameters (D50) between 150 and 200 ?m and ? polymorphism after only 18 hours of storage at 25?C. There was no agglomeration of SLMs during storage at…
Advisors/Committee Members: Efraim, Priscilla, 1978- (advisor), Chiu, Ming Chih (committee member), Maximo, Guilherme Jos? (committee member), Mascarenhas, Maria Cristina Chiarinelli Nucci (committee member), Basso, Rodrigo Corr?a (committee member).
Subjects/Keywords: Micropart?culas l?pidicas;
Cristaliza??o;
Polimorfismo;
Chocolate;
Spray cooling
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APA (6th Edition):
Santos, Camilia Aoyagui dos, 1. (2018). Obten??o e caracteriza??o de sementes de cristaliza??o a base de "hardfat" adicionado de D-limoneno ou ?leo de canola e aplica??o em chocolate : avalia??o dos efeitos tecnol?gicos
. (Thesis). Universidade Estadual de Campinas. Retrieved from http://repositorio.unicamp.br/jspui/handle/REPOSIP/333789
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Santos, Camilia Aoyagui dos, 1984-. “Obten??o e caracteriza??o de sementes de cristaliza??o a base de "hardfat" adicionado de D-limoneno ou ?leo de canola e aplica??o em chocolate : avalia??o dos efeitos tecnol?gicos
.” 2018. Thesis, Universidade Estadual de Campinas. Accessed August 17, 2019.
http://repositorio.unicamp.br/jspui/handle/REPOSIP/333789.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Santos, Camilia Aoyagui dos, 1984-. “Obten??o e caracteriza??o de sementes de cristaliza??o a base de "hardfat" adicionado de D-limoneno ou ?leo de canola e aplica??o em chocolate : avalia??o dos efeitos tecnol?gicos
.” 2018. Web. 17 Aug 2019.
Vancouver:
Santos, Camilia Aoyagui dos 1. Obten??o e caracteriza??o de sementes de cristaliza??o a base de "hardfat" adicionado de D-limoneno ou ?leo de canola e aplica??o em chocolate : avalia??o dos efeitos tecnol?gicos
. [Internet] [Thesis]. Universidade Estadual de Campinas; 2018. [cited 2019 Aug 17].
Available from: http://repositorio.unicamp.br/jspui/handle/REPOSIP/333789.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Santos, Camilia Aoyagui dos 1. Obten??o e caracteriza??o de sementes de cristaliza??o a base de "hardfat" adicionado de D-limoneno ou ?leo de canola e aplica??o em chocolate : avalia??o dos efeitos tecnol?gicos
. [Thesis]. Universidade Estadual de Campinas; 2018. Available from: http://repositorio.unicamp.br/jspui/handle/REPOSIP/333789
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Queens University
28.
Begg, Nathon.
Experimental and Computational Analysis of Evaporative Spray Cooling for Gas Turbine Exhaust Ejectors
.
Degree: Mechanical and Materials Engineering, 2011, Queens University
URL: http://hdl.handle.net/1974/6517
► This research studied the effects of evaporative spray cooling on air-air ejector performance. Experimental data was collected for the purpose of validating computational simulations. This…
(more)
▼ This research studied the effects of evaporative spray cooling on air-air ejector performance. Experimental data was collected for the purpose of validating computational simulations. This was done by modifying an existing air-air ejector to accommodate four spray flow nozzles which were used to atomize cooling water. The only parameter that was varied throughout the study was the mass flow rate of cooling water. One single phase (air) case and four spray flow cases where performed and analyzed. The purpose of the single phase experiment was to have a baseline for the air-air ejector performance and isolate the sources of experimental error contributed by spray flow. Three specialized multiphase flow instruments were designed and fabricated by the author to measure, gas phase temperatures, spray mass flow rates, and mixture total pressures.
A computational study was performed using the collected experimental data for inlet continuous phase and spray mass flow as boundary conditions for equivalent simulations. A temperature gradient modified turbulence model was written by the author to better predict the mixing rates found experimentally which was used for the duration of this research. Secondary droplet breakup was modeled by the author using empirical correlations following preliminary simulations recognizing the deficiencies of commercially available breakup models.
Comparison of experimental and computational cases produced mixed results. It was found that the experimental gas temperature instrument performed poorly for the local droplet fluxes encountered during testing. The spray sampling probe showed more promising results with two integrated mass flows agreeing within 6% of computational simulations. The total pressure probe solved the issue of pressure port clogging, but measurements were representative of mixture density which made an inferred velocity calculation difficult. It was found that evaporation of spray flow before the nozzle exit plane caused a reduction in dynamic pressure and a reduction in back pressure.
A full scale simulation was performed to determine the effects of scaling on evaporative spray cooling performance. It was found that for the geometrically similar full scale model, the total droplet surface area and particle residence times scaled up with the model which increased cooling performance.
Subjects/Keywords: Evaporative;
Spray;
Ejector;
Air-Air;
Naval;
Cooling;
Droplet;
Computational;
CFD;
Analysis
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APA (6th Edition):
Begg, N. (2011). Experimental and Computational Analysis of Evaporative Spray Cooling for Gas Turbine Exhaust Ejectors
. (Thesis). Queens University. Retrieved from http://hdl.handle.net/1974/6517
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Begg, Nathon. “Experimental and Computational Analysis of Evaporative Spray Cooling for Gas Turbine Exhaust Ejectors
.” 2011. Thesis, Queens University. Accessed August 17, 2019.
http://hdl.handle.net/1974/6517.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Begg, Nathon. “Experimental and Computational Analysis of Evaporative Spray Cooling for Gas Turbine Exhaust Ejectors
.” 2011. Web. 17 Aug 2019.
Vancouver:
Begg N. Experimental and Computational Analysis of Evaporative Spray Cooling for Gas Turbine Exhaust Ejectors
. [Internet] [Thesis]. Queens University; 2011. [cited 2019 Aug 17].
Available from: http://hdl.handle.net/1974/6517.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Begg N. Experimental and Computational Analysis of Evaporative Spray Cooling for Gas Turbine Exhaust Ejectors
. [Thesis]. Queens University; 2011. Available from: http://hdl.handle.net/1974/6517
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
29.
Riofrio almeida, Maria Cristina.
Etude des écoulements diphasiques pour le refroidissement des composants électroniques en systèmes embarqués : Study of two-phase flow for cooling electronic components in embedded systems.
Degree: Docteur es, Mécanique des fluides Energétique, Procédés, 2019, Grenoble Alpes
URL: http://www.theses.fr/2019GREAI022
► Cette étude concerne l’étude des écoulements diphasiques dans le cadre du refroidissement des composants électroniques en systèmes embarqués. L’étude bibliographique a permis de sélectionner le…
(more)
▼ Cette étude concerne l’étude des écoulements diphasiques dans le cadre du refroidissement des composants électroniques en systèmes embarqués. L’étude bibliographique a permis de sélectionner le refroidissement par spray comme technique prometteuse pour dissiper des flux de chaleur au-delà de 100 W/cm2. Une étude hydraulique, utilisant de l’eau et du HFE7100 comme fluides de refroidissement, nous a permis de valider des modèles permettant de déterminer la taille et la vitesse de gouttes provenant d’une sélection de buses de spray. Pour la partie thermique, nous avons conçu une section d’essais (évaporateur) permettant de pulvériser en spray afin d’étudier le refroidissement avec une boucle fermée diphasique.Vu la complexité du système de spray influencé par plusieurs paramètres et phénomènes physiques, nous avons isolé le phénomène d’ébullition nucléée dans une configuration en ébullition nucléée avec un élément chauffant identique à celui employé avec le refroidissement par spray. Pour améliorer les échanges thermiques, 6 surfaces avec différentes structurations (macroscopiques, microscopiques et hybrides) ont été sélectionnées. Les résultats de tests avec ces surfaces ont été comparés avec une surface lisse tant pour le refroidissement par spray que pour le refroidissement en vase.D’une part, avec un refroidissement par spray, les surfaces macrostructurées nous ont permis de dissiper des puissances thermiques de l’ordre de 140 W/cm2 avec d’importants coefficients de transfert thermique. D’autre part, avec un système de refroidissement par immersion, une des surfaces hybrides a montré être la plus performante.Les résultats reportés dans cette thèse ont permis d’approfondir la compréhension des mécanismes de transfert de chaleur en refroidissement par spray. De même, ils ouvrent la voie à l’étude des améliorations et optimisations du système permettant de l’employer en systèmes embarqués.
This dissertation concerns the study of two-phase flow cooling of electronic components in embedded systems. From a literature review, Spray Cooling was selected as a promising technique for dissipating heat fluxes above 100 W/cm2. A hydraulic study, using water and HFE7100 as coolants, has validate models for determining the size and speed of drops from a selection of spray nozzles. Regarding the thermal study, we have designed a test section (evaporator) to study cooling in a two-phase closed loop system.Given the complexity of Spray Cooling systems, which are influenced by several parameters and involve several physical phenomena, the nucleate boiling phenomenon has been isolated in a Pool Boling system with an identical heating element as Spray Cooling experiment. To improve heat exchange, 6 surfaces with different structures (macroscopic, microscopic and hybrid) were selected. The boiling test results with these surfaces have been compared with a smooth surface for both Spray Cooling and Pool Boiling.On one hand, in Spray Cooling tests, the macrostructured surfaces dissipated heat flux up to 140 W/cm2 with significant heat…
Advisors/Committee Members: Caney, Nadia (thesis director).
Subjects/Keywords: Écoulements diphasiques; Refroidissement composants électroniques; Composants électroniques; Spray cooling; Micro-Canaux; Two-Phase flow; Microelectronic cooling; Electronic components; Spray cooling; Microchannels; 620
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APA ·
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APA (6th Edition):
Riofrio almeida, M. C. (2019). Etude des écoulements diphasiques pour le refroidissement des composants électroniques en systèmes embarqués : Study of two-phase flow for cooling electronic components in embedded systems. (Doctoral Dissertation). Grenoble Alpes. Retrieved from http://www.theses.fr/2019GREAI022
Chicago Manual of Style (16th Edition):
Riofrio almeida, Maria Cristina. “Etude des écoulements diphasiques pour le refroidissement des composants électroniques en systèmes embarqués : Study of two-phase flow for cooling electronic components in embedded systems.” 2019. Doctoral Dissertation, Grenoble Alpes. Accessed August 17, 2019.
http://www.theses.fr/2019GREAI022.
MLA Handbook (7th Edition):
Riofrio almeida, Maria Cristina. “Etude des écoulements diphasiques pour le refroidissement des composants électroniques en systèmes embarqués : Study of two-phase flow for cooling electronic components in embedded systems.” 2019. Web. 17 Aug 2019.
Vancouver:
Riofrio almeida MC. Etude des écoulements diphasiques pour le refroidissement des composants électroniques en systèmes embarqués : Study of two-phase flow for cooling electronic components in embedded systems. [Internet] [Doctoral dissertation]. Grenoble Alpes; 2019. [cited 2019 Aug 17].
Available from: http://www.theses.fr/2019GREAI022.
Council of Science Editors:
Riofrio almeida MC. Etude des écoulements diphasiques pour le refroidissement des composants électroniques en systèmes embarqués : Study of two-phase flow for cooling electronic components in embedded systems. [Doctoral Dissertation]. Grenoble Alpes; 2019. Available from: http://www.theses.fr/2019GREAI022
30.
Soriano, Guillermo Enrique.
Study of the Physics of Droplet Impingement Cooling.
Degree: 2012, Texas A&M University
URL: http://hdl.handle.net/1969.1/ETD-TAMU-2011-05-9154
► Spray cooling is one of the most promising technologies in applications which require large heat removal capacity in very small areas. Previous experimental studies have…
(more)
▼ Spray cooling is one of the most promising technologies in applications which
require large heat removal capacity in very small areas. Previous experimental studies
have suggested that one of the main mechanisms of heat removal in
spray cooling is
forced convection with strong mixing due to droplet impingement. These mechanisms
have not been completely understood mainly due to the large number of physical variables,
and the inability to modulate and control variables such as droplet frequency
and droplet size. Our approach consists of minimizing the number of experimental
variables by controlling variables such as droplet direction, velocity and diameter.
A study of heat transfer for single and multiple droplet impingements using HFE-
7100 as the
cooling fluid under constant heat flux conditions is presented. Monosized
single and multiple droplet trains were produced using a piezoelectric droplet generator
with the ability to adjust droplet frequency, diameter, velocity, and spacing
between adjacent droplets. In this study, heaters consisting of a layer of Indium Tin
Oxide (ITO) as heating element, and ZnSe substrates were used. Surface temperature
at the liquid-solid interface was measured using Infrared Thermography. Heat
transfer behavior was characterized and critical heat flux was measured. Film thickness
was measured using a non-invasive optical technique inside the crown formation produced by the impinging droplets. Hydrodynamic phenomena at the droplet impact
zone was studied using high speed imaging. Impact regimes of the impinging
droplets were identified, and their effect on heat transfer performance were discussed.
The results and effects of droplet frequency, droplet diameter, droplet velocity, and
fluid flow rate on heat flux behavior, critical heat flux, and film morphology were
elucidated.
The study showed that forced heat convection is the main heat transfer mechanism
inside the crown formation formed by droplet impingement and impact regimes
play an important role on heat transfer behavior. In addition, this study found that
spacing among adjacent droplets is the most important factor for multiple droplet
stream heat transfer behavior. The knowledge generated through the study provides
tools and know-how necessary for the design and development of enhanced
spray
cooling systems.
Advisors/Committee Members: Alvarado, Jorge L. (advisor), Hassan, Yassin (committee member), Banerjee, Debjyoti (committee member), Lau, Sai (committee member).
Subjects/Keywords: Heat transfer; spray cooling; droplet impingement cooling
…III
Jet Cooling Review . . . . . . . . . . . . . . . . .
Spray Cooling Review… …applications such as spray cooling which is routinely used
in miniaturized packaging electronic… …on spray cooling phenomena. The experimental results and
analysis will help in the design… …of better spray and droplet cooling systems.
A. Motivation
Thermal management of… …include: spray cooling, jet cooling, single and multipledroplet cooling, vapor compression…
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APA ·
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APA (6th Edition):
Soriano, G. E. (2012). Study of the Physics of Droplet Impingement Cooling. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2011-05-9154
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Soriano, Guillermo Enrique. “Study of the Physics of Droplet Impingement Cooling.” 2012. Thesis, Texas A&M University. Accessed August 17, 2019.
http://hdl.handle.net/1969.1/ETD-TAMU-2011-05-9154.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Soriano, Guillermo Enrique. “Study of the Physics of Droplet Impingement Cooling.” 2012. Web. 17 Aug 2019.
Vancouver:
Soriano GE. Study of the Physics of Droplet Impingement Cooling. [Internet] [Thesis]. Texas A&M University; 2012. [cited 2019 Aug 17].
Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2011-05-9154.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Soriano GE. Study of the Physics of Droplet Impingement Cooling. [Thesis]. Texas A&M University; 2012. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2011-05-9154
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
◁ [1] [2] [3] ▶
. 
Open Access Theses and Dissertations
