subject:(Critical Pressure Coefficient)

Arizona State University

1. Kirkman, Jeffrey Jordan. Transonic Flow Around Swept Wings: Revisiting Von Kármán’s Similarity Rule.

Degree: Aerospace Engineering, 2016, Arizona State University

URL: http://repository.asu.edu/items/38688

► Modern aircraft are expected to fly faster and more efficiently than their predecessors. To improve aerodynamic efficiency, designers must carefully consider and handle shock wave… (more)

Subjects/Keywords: Aerospace engineering; Aircraft Wing Sweep; Critical Pressure Coefficient; Shock Formation; Transonic Similarity Rule

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APA (6^th Edition):

Kirkman, J. J. (2016). Transonic Flow Around Swept Wings: Revisiting Von Kármán’s Similarity Rule. (Masters Thesis). Arizona State University. Retrieved from http://repository.asu.edu/items/38688

Chicago Manual of Style (16^th Edition):

Kirkman, Jeffrey Jordan. “Transonic Flow Around Swept Wings: Revisiting Von Kármán’s Similarity Rule.” 2016. Masters Thesis, Arizona State University. Accessed January 24, 2021. http://repository.asu.edu/items/38688.

MLA Handbook (7^th Edition):

Kirkman, Jeffrey Jordan. “Transonic Flow Around Swept Wings: Revisiting Von Kármán’s Similarity Rule.” 2016. Web. 24 Jan 2021.

Vancouver:

Kirkman JJ. Transonic Flow Around Swept Wings: Revisiting Von Kármán’s Similarity Rule. [Internet] [Masters thesis]. Arizona State University; 2016. [cited 2021 Jan 24]. Available from: http://repository.asu.edu/items/38688.

Council of Science Editors:

Kirkman JJ. Transonic Flow Around Swept Wings: Revisiting Von Kármán’s Similarity Rule. [Masters Thesis]. Arizona State University; 2016. Available from: http://repository.asu.edu/items/38688

Kansas State University

2. Dahariya, Smreeti. High-pressure pool-boiling heat transfer enhancement and mechanism on engineered surfaces.

Degree: PhD, Department of Mechanical and Nuclear Engineering, 2020, Kansas State University

URL: http://hdl.handle.net/2097/40311

► Boiling has received considerable attention in the technology advancement of electronics cooling for high-performance computing applications. Two-phase cooling has an advantage over a single-phase cooling… (more)

▼ Boiling has received considerable attention in the technology advancement of electronics cooling for high-performance computing applications. Two-phase cooling has an advantage over a single-phase cooling in the high heat removal rate with a small thermal gradient due to the latent heat of vaporization. Many surface modifications have been done in the past including surface roughness, mixed wettability and, porous wick copper play a crucial role in the liquid-vapor phase change heat transfer. However, the mechanisms of high-pressure pool-boiling heat transfer enhancement due to surface modifications has not been well studied or understood. The properties of water, such as the latent heat of vaporization, surface tension, the difference in specific volume of liquid and vapor, decrease at high-pressure. High-pressure pool-boiling heat transfer enhancement is studied fundamentally on various engineered surfaces. The boiling tests are performed at a maximum pressure of 90 psig (620.5 kPa) and then compared to results at 0 psig (0 kPa). The results indicate that the pressure influences the boiling performance through changes in bubble dynamics. The bubble departure diameter, bubble departure frequency, and the active nucleation sites change with pressure. The pool-boiling heat transfer enhancement of a Teflon© coated surface is also experimentally tested, using water as the working fluid. The boiling results are compared with a plain surface at two different pressures, 30 and 45 psig. The maximum heat transfer enhancement is found at the low heat fluxes. At high heat fluxes, a negligible effect is observed in HTC. The primary reasons for the HTC enhancement at low heat fluxes are active nucleation sites at low wall superheat and bubble departure size. The Teflon© coated surface promotes nucleation because of the lower surface energy requirement. The boiling results are also obtained for wick surfaces. The wick surfaces are fabricated using a sintering process. The boiling results are compared with a plain surface. The reasons for enhancements in the pool-boiling performance are primarily due to increased bubble generation, higher bubble release frequency, reduced thermal-hydraulic length modulation, and enhanced thermal conductivity due to the sintered wick layer. The analysis suggests that the Rayleigh-critical wavelength decreases by 4.67 % of varying pressure, which may cause the bubble pinning between the gaps of sintered particles and avoids the bubble coalescence. Changes in the pitch distance indicate that a liquid-vapor phase separation happens at the solid/liquid interface, which impacts the heat-transfer performance significantly. Similarly, the role of the high-pressure over the wicking layer is further analyzed and studied. It is found that the critical flow length, λu reduces by three times with 200 μm particles. The results suggest that the porous wick layer provides a capillary-assist to liquid flow effect, and delays the surface dry out. The surface modification and the pressure amplify the boiling heat… Advisors/Committee Members: Amy R. Betz.

Subjects/Keywords: Critical Heat Flux; Heat Transfer Coefficient; Thermal-Hydraulic; Rayleigh-Critical Wavelength; Pinning Mechanism; Capillary Pressure

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Dahariya, S. (2020). High-pressure pool-boiling heat transfer enhancement and mechanism on engineered surfaces. (Doctoral Dissertation). Kansas State University. Retrieved from http://hdl.handle.net/2097/40311

Chicago Manual of Style (16^th Edition):

Dahariya, Smreeti. “High-pressure pool-boiling heat transfer enhancement and mechanism on engineered surfaces.” 2020. Doctoral Dissertation, Kansas State University. Accessed January 24, 2021. http://hdl.handle.net/2097/40311.

MLA Handbook (7^th Edition):

Dahariya, Smreeti. “High-pressure pool-boiling heat transfer enhancement and mechanism on engineered surfaces.” 2020. Web. 24 Jan 2021.

Vancouver:

Dahariya S. High-pressure pool-boiling heat transfer enhancement and mechanism on engineered surfaces. [Internet] [Doctoral dissertation]. Kansas State University; 2020. [cited 2021 Jan 24]. Available from: http://hdl.handle.net/2097/40311.

Council of Science Editors:

Dahariya S. High-pressure pool-boiling heat transfer enhancement and mechanism on engineered surfaces. [Doctoral Dissertation]. Kansas State University; 2020. Available from: http://hdl.handle.net/2097/40311

3. Vitu, Stéphane. Développement d'une méthode de contributions de groupes pour le calcul du coefficient d'interaction binaire de l'équation d'état de Peng-Robinson et mesures d'équilibres liquide-vapeur de systèmes contenant du CO2 : Agroup contribution method to calculate the binary interaction parmeter of the Peng-Robinson equation of state and vapor-liquid equilibria measurements for systems containing CO2.

Degree: Docteur es, Génie des procédés et des produits, 2007, Lorraine INP

URL: http://www.theses.fr/2007INPL080N

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Nous avons développé une méthode de contributions de groupes permettant d'estimer, en fonction de la température, le coefficient d'interaction binaire (kij) de l'équation d'état de… (more)

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Nous avons développé une méthode de contributions de groupes permettant d'estimer, en fonction de la température, le coefficient d'interaction binaire (kij) de l'équation d'état de Peng Robinson. Notre approche rend cette équation d'état prédictive. Douze groupes sont définis et il est possible d'estimer les kij pour n'importe quel mélange renfermant des alcanes, des aromatiques, des naphtènes et du CO2. Les diagrammes de phase et lieux des points critiques des systèmes binaires sont bien prédits par le modèle baptisé PPR78 (Predictive 1978, Peng Robinson equation of state). Ce modèle permet également de traiter efficacement les mélanges multiconstituants comme les pétroles bruts et les gaz naturels. A l'aide d'une cellule haute pression, des mesures d'équilibres liquide - vapeur ont été réalisées pour la première fois sur deux systèmes binaires : CO2 méthylcyclopentane et CO2 isopropylcyclohexane. Des mesures ont également été faites sur un mélange renfermant du CO2 et cinq hydrocarbures

A group contribution method allowing the estimation of the temperature dependent binary interaction parameter (kij) for the Peng Robinson equation of state is proposed. Doing so, a new predictive thermodynamic model is born. Twelve groups are defined and it is now possible to estimate the kij for any mixture containing alkanes, aromatics, naphthenes and CO2, whatever the temperature. The model, called PPR78 (Predictive 1978, Peng Robinson equation of state), gives a good description of the phase diagrams and critical locus of binary systems. This predictive model can be successfully employed for the simulation of many mixtures such as natural gases and petroleum fluids. Using a high pressure visual cell, vapor liquid equilibria measurements were made for two binary systems: CO2 methylcyclopentane and CO2 isopropylcyclohexane. For these two systems, no literature data were available. Finally, we measured bubble and dew points on a five component hydrocarbon mixture in the presence of CO2

Advisors/Committee Members: Barth, Danielle (thesis director).

Subjects/Keywords: Equation d'état; Equilibre liquide-vapeur; Modèle prédictif; Méthode de contributions de groupes; Coefficient d'interaction binaire; Lieu de points critiques; Cellule haute pression; Equation of state; Vapor-liquid equilibrium; Predictive model; Group contribution method; Binary interaction parameter; Critical locus; High pressure cell

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Vitu, S. (2007). Développement d'une méthode de contributions de groupes pour le calcul du coefficient d'interaction binaire de l'équation d'état de Peng-Robinson et mesures d'équilibres liquide-vapeur de systèmes contenant du CO2 : Agroup contribution method to calculate the binary interaction parmeter of the Peng-Robinson equation of state and vapor-liquid equilibria measurements for systems containing CO2. (Doctoral Dissertation). Lorraine INP. Retrieved from http://www.theses.fr/2007INPL080N

Chicago Manual of Style (16^th Edition):

Vitu, Stéphane. “Développement d'une méthode de contributions de groupes pour le calcul du coefficient d'interaction binaire de l'équation d'état de Peng-Robinson et mesures d'équilibres liquide-vapeur de systèmes contenant du CO2 : Agroup contribution method to calculate the binary interaction parmeter of the Peng-Robinson equation of state and vapor-liquid equilibria measurements for systems containing CO2.” 2007. Doctoral Dissertation, Lorraine INP. Accessed January 24, 2021. http://www.theses.fr/2007INPL080N.

MLA Handbook (7^th Edition):

Vitu, Stéphane. “Développement d'une méthode de contributions de groupes pour le calcul du coefficient d'interaction binaire de l'équation d'état de Peng-Robinson et mesures d'équilibres liquide-vapeur de systèmes contenant du CO2 : Agroup contribution method to calculate the binary interaction parmeter of the Peng-Robinson equation of state and vapor-liquid equilibria measurements for systems containing CO2.” 2007. Web. 24 Jan 2021.

Vancouver:

Vitu S. Développement d'une méthode de contributions de groupes pour le calcul du coefficient d'interaction binaire de l'équation d'état de Peng-Robinson et mesures d'équilibres liquide-vapeur de systèmes contenant du CO2 : Agroup contribution method to calculate the binary interaction parmeter of the Peng-Robinson equation of state and vapor-liquid equilibria measurements for systems containing CO2. [Internet] [Doctoral dissertation]. Lorraine INP; 2007. [cited 2021 Jan 24]. Available from: http://www.theses.fr/2007INPL080N.

Council of Science Editors:

Vitu S. Développement d'une méthode de contributions de groupes pour le calcul du coefficient d'interaction binaire de l'équation d'état de Peng-Robinson et mesures d'équilibres liquide-vapeur de systèmes contenant du CO2 : Agroup contribution method to calculate the binary interaction parmeter of the Peng-Robinson equation of state and vapor-liquid equilibria measurements for systems containing CO2. [Doctoral Dissertation]. Lorraine INP; 2007. Available from: http://www.theses.fr/2007INPL080N

Universidade do Rio Grande do Sul

4. Lavalle, Laura Vanessa Araque. Estudo da interação solo-concreto das estacas escavadas do campo experimental de Araquari.

Degree: 2017, Universidade do Rio Grande do Sul

URL: http://hdl.handle.net/10183/163427

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Procurando diminuir as incertezas a respeito do comportamento de estacas em perfis arenosos, desenvolveu-se um campo experimental localizado em Araquari-SC, conduzido pela Universidade Federal do… (more)

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Procurando diminuir as incertezas a respeito do comportamento de estacas em perfis arenosos, desenvolveu-se um campo experimental localizado em Araquari-SC, conduzido pela Universidade Federal do Rio Grande do Sul, no qual foram executados (a) ensaios de campo para definir as condições geotécnicas do solo, (b) estacas escavadas e hélice continua e (c) provas de carga estática nos elementos estruturais. O presente trabalho tem como objetivo estudar as variáveis que intervêm no mecanismo de transferência de carga ao solo. Mediante ensaios de laboratório, caracterizou-se o solo presente no campo experimental, definiram-se os parâmetros de resistência, mineralogia, forma, distribuição e tamanho das partículas, para serem usadas na retro análise do coeficiente de pressão de solo (ks) das provas de carga. Para esta finalidade foram analisados os resultados medidos em estacas escavadas executadas com bentonita e polímero. A retro análise foi realizada através do método beta (β), abordagem que permite a obtenção da capacidade lateral das estacas construídas em perfis arenosos, baseado nas tensões verticais, no coeficiente de pressão de solo e no ângulo de atrito da interface solo-estaca. Devido à interação entre as partículas do solo e concreto da estaca, estas são mobilizadas a elevados níveis de deformações, o ângulo de atrito da interface é considerado próximo ao ângulo de atrito no estado crítico da areia. O solo presente no campo experimental corresponde a areia fina com lentes de silte. Assim, os parâmetros de resistência definidos foram o ângulo de atrito no estado crítico e de pico com valores de 33,0° e 33,4° respetivamente. O ângulo no estado crítico foi utilizado na retro análise das provas de carga e como resultado foi obtido o ks, para posteriormente ser comparado ao coeficiente de empuxo no repouso (k0). Os resultados mostraram que com a profundidade o valor ks aproxima-se ao valor de k0, apresentado uma relação de ks/k0 próxima a unidade. Conclui-se que, o mecanismo de transferência de carga entre o solo e a estaca pode ser avaliado em função das tensões iniciais do depósito, expressas a partir de k0 estimado com base nos ensaios de laboratório.

In order to reduce the uncertainties regarding the behavior of piles in sandy profiles, an experimental field was developed by the Federal University of Rio Grande do Sul in Araquari-SC, where were executed (a) field tests to define soil geotechnical conditions, (b) bored and continuous flight auger piles and (c) static load tests on the structural elements. The aim of this research was to study the variables that intervene in the soil load transfer mechanism. The soil at the experimental field was characterized by laboratory tests, and parameters of resistance, mineralogy, particle shape, distribution and size were obtained for use in the back analysis of the soil pressure coefficient (ks) of the load tests. For this purpose, were analyzed the results measured on bored piles executed with bentonite and polymer. The back analysis was made using the beta method (β),…

Advisors/Committee Members: Schnaid, Fernando.

Subjects/Keywords: Solo : Caracterização; Sand; Beta method; Solo arenoso; Ensaios de laboratório; Load tests; Soil pressure coefficient; Estacas escavadas; At rest lateral earth pressure coefficient; Prova de carga; Critical state

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Lavalle, L. V. A. (2017). Estudo da interação solo-concreto das estacas escavadas do campo experimental de Araquari. (Thesis). Universidade do Rio Grande do Sul. Retrieved from http://hdl.handle.net/10183/163427

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Lavalle, Laura Vanessa Araque. “Estudo da interação solo-concreto das estacas escavadas do campo experimental de Araquari.” 2017. Thesis, Universidade do Rio Grande do Sul. Accessed January 24, 2021. http://hdl.handle.net/10183/163427.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Lavalle, Laura Vanessa Araque. “Estudo da interação solo-concreto das estacas escavadas do campo experimental de Araquari.” 2017. Web. 24 Jan 2021.

Vancouver:

Lavalle LVA. Estudo da interação solo-concreto das estacas escavadas do campo experimental de Araquari. [Internet] [Thesis]. Universidade do Rio Grande do Sul; 2017. [cited 2021 Jan 24]. Available from: http://hdl.handle.net/10183/163427.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Lavalle LVA. Estudo da interação solo-concreto das estacas escavadas do campo experimental de Araquari. [Thesis]. Universidade do Rio Grande do Sul; 2017. Available from: http://hdl.handle.net/10183/163427

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of North Texas

5. Altalidi, Sulaiman Saleh. Two-Phase Spray Cooling with HFC-134a and HFO-1234yf for Thermal Management of Automotive Power Electronics using Practical Enhanced Surfaces.

Degree: 2017, University of North Texas

URL: https://digital.library.unt.edu/ark:/67531/metadc1011876/

► The objective of this research was to investigate the performance of two-phase spray cooling with HFC-134a and HFO-1234yf refrigerants using practical enhanced heat transfer surfaces.… (more)

Subjects/Keywords: Spray cooling; Enhanced surface; Critical heat flux (CHF); Heat transfer coefficient (HTC); refrigerants; Temperature; Pressure; Experiment; electronics.

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APA (6^th Edition):

Altalidi, S. S. (2017). Two-Phase Spray Cooling with HFC-134a and HFO-1234yf for Thermal Management of Automotive Power Electronics using Practical Enhanced Surfaces. (Thesis). University of North Texas. Retrieved from https://digital.library.unt.edu/ark:/67531/metadc1011876/

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Altalidi, Sulaiman Saleh. “Two-Phase Spray Cooling with HFC-134a and HFO-1234yf for Thermal Management of Automotive Power Electronics using Practical Enhanced Surfaces.” 2017. Thesis, University of North Texas. Accessed January 24, 2021. https://digital.library.unt.edu/ark:/67531/metadc1011876/.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Altalidi, Sulaiman Saleh. “Two-Phase Spray Cooling with HFC-134a and HFO-1234yf for Thermal Management of Automotive Power Electronics using Practical Enhanced Surfaces.” 2017. Web. 24 Jan 2021.

Vancouver:

Altalidi SS. Two-Phase Spray Cooling with HFC-134a and HFO-1234yf for Thermal Management of Automotive Power Electronics using Practical Enhanced Surfaces. [Internet] [Thesis]. University of North Texas; 2017. [cited 2021 Jan 24]. Available from: https://digital.library.unt.edu/ark:/67531/metadc1011876/.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Altalidi SS. Two-Phase Spray Cooling with HFC-134a and HFO-1234yf for Thermal Management of Automotive Power Electronics using Practical Enhanced Surfaces. [Thesis]. University of North Texas; 2017. Available from: https://digital.library.unt.edu/ark:/67531/metadc1011876/

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Virginia Tech

6. Teye, Frederick David. Continuous flash extraction of alcohols from fermentation broth.

Degree: MS, Biological Systems Engineering, 2009, Virginia Tech

URL: http://hdl.handle.net/10919/31418

► A new method of in situ extraction of alcohols from fermentation broth was investigated. The extraction method exploited the latent advantages of the non-equilibrium phase… (more)

▼ A new method of in situ extraction of alcohols from fermentation broth was investigated. The extraction method exploited the latent advantages of the non-equilibrium phase interaction of the fluid system in the flash tank to effectively recover the alcohol. Carbon dioxide gas ranging from 4.2L/min to 12.6L/min was used to continuously strip 2 and 12% (v/v) ethanol solution in a fermentor with a recycle. Ethanol and water in the stripped gas was recovered by compressing and then flashing into a flash tank that was maintained at 5 to 70bar and 5 to 55 °C where two immiscible phases comprising CO2-rich phase (top layer) and H2O-rich phase (bottom layer) were formed. The H2O-rich bottom layer was collected as the Bottoms. The CO2-rich phase was continuously throttled producing a condensate (Tops) as a result of the Joule-Thompson cooling effect. The total ethanol recovered from the extraction scheme was 46.0 to 80% for the fermentor containing 2% (v/v) ethanol and 57 to 89% for the fermentor containing 12% (v/v) ethanol. The concentration of ethanol in the Bottoms ranged from 8.0 to 14.9 %(v/v) for the extraction from the 2 %(v/v) ethanol solution and 40.0 to 53.8 %(v/v) for the 12% (v/v) fermentor ethanol extraction. The Bottoms concentration showed a fourfold increase compared to the feed. The ethanol concentration of the Tops were much higher with the highest at approx. 90% (v/v) ethanol, however the yields were extremely low. Compression work required ranged from 6.4 to 20.1 MJ/kg ethanol recovered from the gas stream in the case of 12% (v/v) ethanol in fermentor. The energy requirement for the 2% (v/v) extraction was 84MJ/kg recovered ethanol. The measured Joule-Thompson cooling effect for the extraction scheme was in the range of 10 to 20% the work of compressing the gas. The lowest measured throttle valve temperature was -47 °C at the flash tank conditions of 70bar and 25 °C. Optimization of the extraction scheme showed that increasing the temperature of the flash tank reduced the amount of ethanol recovered. Increasing the pressure of the flash tank increased the total ethanol recovered but beyond 45bar it appeared to reduce the yield. The 12.6L/min carbon dioxide flow rate favored the high pressure(70bar) extraction whiles 4.2L/min appeared to favor the low pressure(40bar) extraction. The studies showed that the extraction method could potentially be used to recover ethanol and other fermentation products. Advisors/Committee Members: Agblevor, Foster Aryi (committeechair), Zhang, Chenming Mike (committee member), Achenie, Luke E. K. (committee member).

Subjects/Keywords: saturation temperature; equilibrium; Flashing; Bottoms; Tops; critical pressure; gas partition; Joule-Thompson coefficient; critical temperature; isothermal flash tank; throttling; saturation pressure

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Teye, F. D. (2009). Continuous flash extraction of alcohols from fermentation broth. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/31418

Chicago Manual of Style (16^th Edition):

Teye, Frederick David. “Continuous flash extraction of alcohols from fermentation broth.” 2009. Masters Thesis, Virginia Tech. Accessed January 24, 2021. http://hdl.handle.net/10919/31418.

MLA Handbook (7^th Edition):

Teye, Frederick David. “Continuous flash extraction of alcohols from fermentation broth.” 2009. Web. 24 Jan 2021.

Vancouver:

Teye FD. Continuous flash extraction of alcohols from fermentation broth. [Internet] [Masters thesis]. Virginia Tech; 2009. [cited 2021 Jan 24]. Available from: http://hdl.handle.net/10919/31418.

Council of Science Editors:

Teye FD. Continuous flash extraction of alcohols from fermentation broth. [Masters Thesis]. Virginia Tech; 2009. Available from: http://hdl.handle.net/10919/31418

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