subject:(Impinging jet)

Delft University of Technology

1. Shreedharan, V.A. Design and development of a small scale jet head for multi-lateral drilling:.

Degree: 2015, Delft University of Technology

URL: http://resolver.tudelft.nl/uuid:2d9caa94-62e3-48a8-ab52-b74d8c38816e

► Extraction of hydrocarbons from the sub-surface is becoming harder with the reservoirs getting smaller and the formations increasingly tighter. Considering the current circumstances, production enhancement… (more)

▼ Extraction of hydrocarbons from the sub-surface is becoming harder with the reservoirs getting smaller and the formations increasingly tighter. Considering the current circumstances, production enhancement otherwise known as “stimulation” techniques, play a vital role in ensuring economic returns from a hydrocarbon reservoir. The use of water jetting for enhancing the connectivity of oil & gas wells to reservoirs is gaining attention these days over hydraulic fracturing in the oil & gas industry due to the enormous costs and rising concerns over environmental impacts associated with fracturing. Water jetting systems operate at high pressures and flow rates in order to effectively drill through tight sandstone formations. Computational fluid dynamics provides the right platform to help design and improve a jet drilling tool before progressing to field trials. Such an optimization process requires insight into the inter-granular interaction between fluid & rock surface at down-hole conditions and the mechanism of rock erosion due to water jetting. Initially, the rock surface is geometrically modeled in order to provide the fluid flow domain to analyse the fluid-rock interaction. Subsequently, empirical rough wall function is utilized to emulate impinging jet flows over rock surfaces. Finally, the most viable wall treatment is employed for simulations of the small-scale rotating jet head in a bore-hole environment. The developed jet head has the potential to lower water usage & power consumption, improve water recyclability and reduce logistics cost when compared to hydraulic fracturing. Additionally, controlled placement of the needle wells allows operations in reservoirs which are in close proximity to underground aquifers, reservoirs with naturally occurring faults and fractures, reservoirs having compatibility issues with fluids and additives used in hydraulic fracturing. The needle stimulation technology is expected to perform comparable to hydraulic fracturing in these challenging reservoirs by offering advantages in health, safety and environment (HSE) aspects. Advisors/Committee Members: Pecnik, R., Reinicke, A.B..

Subjects/Keywords: CFD; jet drilling; impinging jet; rough walls

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APA (6^th Edition):

Shreedharan, V. A. (2015). Design and development of a small scale jet head for multi-lateral drilling:. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:2d9caa94-62e3-48a8-ab52-b74d8c38816e

Chicago Manual of Style (16^th Edition):

Shreedharan, V A. “Design and development of a small scale jet head for multi-lateral drilling:.” 2015. Masters Thesis, Delft University of Technology. Accessed December 15, 2019. http://resolver.tudelft.nl/uuid:2d9caa94-62e3-48a8-ab52-b74d8c38816e.

MLA Handbook (7^th Edition):

Shreedharan, V A. “Design and development of a small scale jet head for multi-lateral drilling:.” 2015. Web. 15 Dec 2019.

Vancouver:

Shreedharan VA. Design and development of a small scale jet head for multi-lateral drilling:. [Internet] [Masters thesis]. Delft University of Technology; 2015. [cited 2019 Dec 15]. Available from: http://resolver.tudelft.nl/uuid:2d9caa94-62e3-48a8-ab52-b74d8c38816e.

Council of Science Editors:

Shreedharan VA. Design and development of a small scale jet head for multi-lateral drilling:. [Masters Thesis]. Delft University of Technology; 2015. Available from: http://resolver.tudelft.nl/uuid:2d9caa94-62e3-48a8-ab52-b74d8c38816e

University of Illinois – Urbana-Champaign

2. Mejia Alvarez, Ricardo. Polymer-induced turbulence modifications in an impinging jet.

Degree: MS, 0242, 2010, University of Illinois – Urbana-Champaign

URL: http://hdl.handle.net/2142/16174

► This effort explores the impact of dilute polymer solutions on the turbulence characteristics in a submersed liquid impinging-jet configuration. Turbulent impinging jets are commonly used… (more)

Subjects/Keywords: impinging jet; polymers; Particle-image velocimetry (PIV)

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APA (6^th Edition):

Mejia Alvarez, R. (2010). Polymer-induced turbulence modifications in an impinging jet. (Thesis). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/16174

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):

Mejia Alvarez, Ricardo. “Polymer-induced turbulence modifications in an impinging jet.” 2010. Thesis, University of Illinois – Urbana-Champaign. Accessed December 15, 2019. http://hdl.handle.net/2142/16174.

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

MLA Handbook (7^th Edition):

Mejia Alvarez, Ricardo. “Polymer-induced turbulence modifications in an impinging jet.” 2010. Web. 15 Dec 2019.

Vancouver:

Mejia Alvarez R. Polymer-induced turbulence modifications in an impinging jet. [Internet] [Thesis]. University of Illinois – Urbana-Champaign; 2010. [cited 2019 Dec 15]. Available from: http://hdl.handle.net/2142/16174.

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

Council of Science Editors:

Mejia Alvarez R. Polymer-induced turbulence modifications in an impinging jet. [Thesis]. University of Illinois – Urbana-Champaign; 2010. Available from: http://hdl.handle.net/2142/16174

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

Queens University

3. Wu, Wen. Numerical study of an impinging jet with embedded vortices .

Degree: Mechanical and Materials Engineering, 2016, Queens University

URL: http://hdl.handle.net/1974/14045

► Large-eddy simulations of round forced impinging jets at laboratory scale are performed, as a simplified model of the helicopter rotor wake; the goals were to… (more)

▼ Large-eddy simulations of round forced impinging jets at laboratory scale are performed, as a simplified model of the helicopter rotor wake; the goals were to understand the dynamics of the vortices, and to help develop engineering correlation and models. First, I studied the flow over smooth surfaces, then the Reynolds number effects and the performance of lower-level models in this flow were explored. Finally, I investigated surface roughness effects. The interaction between the vortices and the wall resulted in the formation of secondary vorticity that was lifted up and rolled around the primary vortex. These large-scale vortices play an important role in determining the flow. The dynamics of the vortex evolution are initially dominated by an inviscid mechanism. As the interaction with the wall begins, however, the contribution of turbulent diffusion to the vorticity transport (TVD) becomes the leading term weakening the primary vortex. This phenomenon is extremely robust, leading to similar vortex decay rates regardless of the level of turbulence in the jet and the nature of the near-wall flow. The mean-flow three-dimensionality due to a short-wavelength azimuthal instability also plays a role in the evolution of the vortices. Surface roughness significantly modified the near-wall flow, including displacement of the velocity profile, increase of wall stress, and amplification of turbulence levels. The near-wall flow changes due to the roughness are advected to the outer layer during the separation of the secondary vorticity, rather than being confined in the vicinity of the roughness elements. The robust TVD mechanism, however, prevent the vortices from being strongly affected by these changes. This flow is particularly challenging for turbulence models. The tested RANS models exhibited poor performance. The error sources were first identified as their incapability in predicting both the shear-layer instability, and the local unsteady separation. Secondly, the well-known shortcomings of the eddy-viscosity assumption in wall jets were amplified here by the counter-gradient transport during the vortex evolution. Finally, since the TVD term depends on the second derivative of the shear stress, the RANS model errors were naturally amplified. The WMLES predicted vortex decay in good agreement with the resolved LES data.

Subjects/Keywords: Numerical simulation; impinging jet; roughness; vortices

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APA (6^th Edition):

Wu, W. (2016). Numerical study of an impinging jet with embedded vortices . (Thesis). Queens University. Retrieved from http://hdl.handle.net/1974/14045

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):

Wu, Wen. “Numerical study of an impinging jet with embedded vortices .” 2016. Thesis, Queens University. Accessed December 15, 2019. http://hdl.handle.net/1974/14045.

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

MLA Handbook (7^th Edition):

Wu, Wen. “Numerical study of an impinging jet with embedded vortices .” 2016. Web. 15 Dec 2019.

Vancouver:

Wu W. Numerical study of an impinging jet with embedded vortices . [Internet] [Thesis]. Queens University; 2016. [cited 2019 Dec 15]. Available from: http://hdl.handle.net/1974/14045.

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

Council of Science Editors:

Wu W. Numerical study of an impinging jet with embedded vortices . [Thesis]. Queens University; 2016. Available from: http://hdl.handle.net/1974/14045

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

Université de Grenoble

4. Kim, Yeweon. Etude numérique et expérimentale d'une pompe à chaleur thermoélectrique innovante basée sur une conception intégrée et la technique du jet impactant : Numerical and Experimental Study of a Thermoelectric Heat Pump (THP) Innovative based on an Integrated Design and Technology 's impinging Jet.

Degree: Docteur es, Génie civil et Sciences de l'habitat, 2013, Université de Grenoble

URL: http://www.theses.fr/2013GRENA005

►

Les pompes à chaleur thermoélectriques (PACTE) présentent différents avantages par rapport aux pompes à chaleur thermodynamiques classiques. Plus particulièrement, les performances des PACTE sont intéressantes… (more)

▼

Les pompes à chaleur thermoélectriques (PACTE) présentent différents avantages par rapport aux pompes à chaleur thermodynamiques classiques. Plus particulièrement, les performances des PACTE sont intéressantes lorsque les écarts de température entre sources sont modestes, ce qui est par exemple le cas du chauffage aéraulique des bâtiments basse consommation (BBC) à partir d'une Ventilation Mécanique Double Flux (VMC DF). L'objectif de l'étude est donc de développer un démonstrateur de pompe à chaleur thermoélectrique réversible capable d'assurer la puissance de chauffage/refroidissement nécessaire à un logement de type BBC. Ce travail repose sur différents modèles analytiques et numériques validés expérimentalement. Cette étude vise à concevoir un système de pompe à chaleur thermoélectrique performant, l'objectif étant l'amélioration du coefficient de performance (COP) de la PACTE. Les transferts de chaleur à la surface des éléments thermoélectriques sont intensifiés par la technique du jet impactant, et le dimensionnement du système est optimisé en fonction des conditions d'utilisation. Avec le démonstrateur de résultats précédents de la PACTE, le COP saisonnier a été déterminé. Après couplage au bâtiment, cela a permis de montrer une nette amélioration des performances du système.

As house heating tends to be more efficient, Thermoelectric Heat Pump (THP) is an interesting alternative to classic thermodynamic system (with mechanical vapor compression system). In particular, THP becomes favorable as soon as the sources temperature difference is small, which is the case in energy efficient buildings with an exhaust/supply mechanical ventilation system (ESMVS). The objective of the study is to develop a reversible THP prototype capable of supplying the heating / cooling power needed in an energy efficient building. This work is based on different analytical and numerical models validated experimentally. This study aims to develop an efficient thermoelectric heat pump system and to improve its coefficient of performance (COP) by increasing heat transfer on the surface of the thermoelectric elements with impinging jet, and optimizing the THP by dimensioning the system based on operating conditions. With the results obtained with the THP prototype, the seasonal COP is determined. After coupling the THP system to the building, we show an improvement in system performance.

Advisors/Committee Members: Fraisse, Gilles (thesis director), Ramousse, Julien (thesis director).

Subjects/Keywords: Pompe a chaleur thermoélectrique; Jet impactant; Heatpump thermoelectric; Impinging jet

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APA (6^th Edition):

Kim, Y. (2013). Etude numérique et expérimentale d'une pompe à chaleur thermoélectrique innovante basée sur une conception intégrée et la technique du jet impactant : Numerical and Experimental Study of a Thermoelectric Heat Pump (THP) Innovative based on an Integrated Design and Technology 's impinging Jet. (Doctoral Dissertation). Université de Grenoble. Retrieved from http://www.theses.fr/2013GRENA005

Chicago Manual of Style (16^th Edition):

Kim, Yeweon. “Etude numérique et expérimentale d'une pompe à chaleur thermoélectrique innovante basée sur une conception intégrée et la technique du jet impactant : Numerical and Experimental Study of a Thermoelectric Heat Pump (THP) Innovative based on an Integrated Design and Technology 's impinging Jet.” 2013. Doctoral Dissertation, Université de Grenoble. Accessed December 15, 2019. http://www.theses.fr/2013GRENA005.

MLA Handbook (7^th Edition):

Kim, Yeweon. “Etude numérique et expérimentale d'une pompe à chaleur thermoélectrique innovante basée sur une conception intégrée et la technique du jet impactant : Numerical and Experimental Study of a Thermoelectric Heat Pump (THP) Innovative based on an Integrated Design and Technology 's impinging Jet.” 2013. Web. 15 Dec 2019.

Vancouver:

Kim Y. Etude numérique et expérimentale d'une pompe à chaleur thermoélectrique innovante basée sur une conception intégrée et la technique du jet impactant : Numerical and Experimental Study of a Thermoelectric Heat Pump (THP) Innovative based on an Integrated Design and Technology 's impinging Jet. [Internet] [Doctoral dissertation]. Université de Grenoble; 2013. [cited 2019 Dec 15]. Available from: http://www.theses.fr/2013GRENA005.

Council of Science Editors:

Kim Y. Etude numérique et expérimentale d'une pompe à chaleur thermoélectrique innovante basée sur une conception intégrée et la technique du jet impactant : Numerical and Experimental Study of a Thermoelectric Heat Pump (THP) Innovative based on an Integrated Design and Technology 's impinging Jet. [Doctoral Dissertation]. Université de Grenoble; 2013. Available from: http://www.theses.fr/2013GRENA005

Indian Institute of Science

5. Rakesh, P. A Study of the Characteristics of Gas-On-Liquid Impinging Injectors.

Degree: 2014, Indian Institute of Science

URL: http://hdl.handle.net/2005/3126

► The work presented here pertains to investigations on gas-on-liquid type of impinging injectors with a generic approach with prospective applications in several areas, and at… (more)

▼ The work presented here pertains to investigations on gas-on-liquid type of impinging injectors with a generic approach with prospective applications in several areas, and at places with particular emphasis on cryogenic or semi-cryogenic liquid propellant rockets. In such rockets, one of the components arrives at the injector in a gaseous phase after passing through the regenerative coolant passages or a preceding combustion stage. Most often, the injectors in such systems are of shear coaxial type. The shear coaxial injectors suffer from several disadvantages like complexity in design, manufacture and quality control. Adoption of impinging jet configuration can alleviate these problems in addition to providing further benefits in terms of cost, robustness in high temperature environment and manifolding. However, there is very little literature on gas-on-liquid injectors either in this context or in any other Even for the simplest form of impinging injectors such as like-on-like doublets, literature provides no conclusive direction at describing a spray from the theoretical models of physical mechanisms. Empirical approach is still the prime mode of obtaining a proper understanding of the phenomena. Steady state spray characterization includes mainly of describing the spatial distribution of liquid mass and drop size distribution as a function of geometric and injection parameters. The parameters that are likely to have an impact on spray characteristics are orifice diameter, ratio of orifice length to diameter, pre-impingement length of individual jets, inter orifice distance, impingement angle, jet velocity and condition of the jet just before impingement. The gas-on- liquid configuration is likely to experience some qualitative changes because of the expansion of the gas jet. The degree to which each one of the above variables influences the drop size and mass distribution having implication to combustion performance forms the core theme of the thesis. A dedicated experimental facility has been built, calibrated and deployed exhaustively. While spray drop size measurement is done largely by a laser diffraction instrument, some of the cases warranted an image processing technique. Two different image processing algorithms are developed in-house for this purpose. The granulometric image processing method developed earlier in the group for cryogenic sprays is modified and its applicability to gas-on-liquid impinging sprays are verified. Another technique based on the Hough transform which is feature extraction technique for extracting quantitative information has also been developed and used for gas-on-liquid impinging injectors. A comparative study of conventional liquid-on-liquid doublet with gas-on-liquid impinging injectors are first made to establish the importance of studying gas-on-liquid impinging injectors. The study identifies the similarities and differences between the two types and highlights the features that make such injectors attractive as replacements to coaxial… Advisors/Committee Members: Raghunandan, B N.

Subjects/Keywords: Impinging Injectors; Impinging Atomizers; Gas-On-Liquid Impinging Injectors; Liquid Propellant Rockets; Impinging Jet Injectors; Atomizers; Cryogenic Rocket Injectors; Impinging Fuel Injector Atomization; Impinging Injectors Spraying; Image Processing - Spraying; Gas-On-Liquid Impinging Sprays; Liquid-on Liquid Impingement; Aerospace Engineering

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APA (6^th Edition):

Rakesh, P. (2014). A Study of the Characteristics of Gas-On-Liquid Impinging Injectors. (Thesis). Indian Institute of Science. Retrieved from http://hdl.handle.net/2005/3126

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):

Rakesh, P. “A Study of the Characteristics of Gas-On-Liquid Impinging Injectors.” 2014. Thesis, Indian Institute of Science. Accessed December 15, 2019. http://hdl.handle.net/2005/3126.

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

MLA Handbook (7^th Edition):

Rakesh, P. “A Study of the Characteristics of Gas-On-Liquid Impinging Injectors.” 2014. Web. 15 Dec 2019.

Vancouver:

Rakesh P. A Study of the Characteristics of Gas-On-Liquid Impinging Injectors. [Internet] [Thesis]. Indian Institute of Science; 2014. [cited 2019 Dec 15]. Available from: http://hdl.handle.net/2005/3126.

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

Council of Science Editors:

Rakesh P. A Study of the Characteristics of Gas-On-Liquid Impinging Injectors. [Thesis]. Indian Institute of Science; 2014. Available from: http://hdl.handle.net/2005/3126

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

Univerzitet u Beogradu

6. Cvetinović, Dejan, 1967-. Eksperimentalno i numeričko ispitivanje uticaja modifikacije turbulentnog osnosimetričnog mlaza zvučnim oscilacijama na proces prenosa toplote pri udaru o ravnu zagrejanu podlogu.

Degree: Mašinski fakultet, 2016, Univerzitet u Beogradu

URL: https://fedorabg.bg.ac.rs/fedora/get/o:12332/bdef:Content/get

Mehanika - Mehanika fluida / Mechanics - Fluid mechanics

Predmet ovog istraživanja je turbulentnoži osnosimetrični slobodni mlaz vazduha koji ističe u mirnu okolnu sredinu, fluida istih karakteristika iz mlaznica različitih konfiguracija...

Advisors/Committee Members: Čantrak, Svetislav, 1947-.

Subjects/Keywords: turbulent axisymmetric jet; impinging jet heat transfer; numerical simulation; acoustic oscillations modification

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APA (6^th Edition):

Cvetinović, Dejan, 1. (2016). Eksperimentalno i numeričko ispitivanje uticaja modifikacije turbulentnog osnosimetričnog mlaza zvučnim oscilacijama na proces prenosa toplote pri udaru o ravnu zagrejanu podlogu. (Thesis). Univerzitet u Beogradu. Retrieved from https://fedorabg.bg.ac.rs/fedora/get/o:12332/bdef:Content/get

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):

Cvetinović, Dejan, 1967-. “Eksperimentalno i numeričko ispitivanje uticaja modifikacije turbulentnog osnosimetričnog mlaza zvučnim oscilacijama na proces prenosa toplote pri udaru o ravnu zagrejanu podlogu.” 2016. Thesis, Univerzitet u Beogradu. Accessed December 15, 2019. https://fedorabg.bg.ac.rs/fedora/get/o:12332/bdef:Content/get.

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

MLA Handbook (7^th Edition):

Cvetinović, Dejan, 1967-. “Eksperimentalno i numeričko ispitivanje uticaja modifikacije turbulentnog osnosimetričnog mlaza zvučnim oscilacijama na proces prenosa toplote pri udaru o ravnu zagrejanu podlogu.” 2016. Web. 15 Dec 2019.

Vancouver:

Cvetinović, Dejan 1. Eksperimentalno i numeričko ispitivanje uticaja modifikacije turbulentnog osnosimetričnog mlaza zvučnim oscilacijama na proces prenosa toplote pri udaru o ravnu zagrejanu podlogu. [Internet] [Thesis]. Univerzitet u Beogradu; 2016. [cited 2019 Dec 15]. Available from: https://fedorabg.bg.ac.rs/fedora/get/o:12332/bdef:Content/get.

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

Council of Science Editors:

Cvetinović, Dejan 1. Eksperimentalno i numeričko ispitivanje uticaja modifikacije turbulentnog osnosimetričnog mlaza zvučnim oscilacijama na proces prenosa toplote pri udaru o ravnu zagrejanu podlogu. [Thesis]. Univerzitet u Beogradu; 2016. Available from: https://fedorabg.bg.ac.rs/fedora/get/o:12332/bdef:Content/get

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

Penn State University

7. Myers, Leighton Montgomery. Investigation of the Flow-field of Two Parallel Round Jets Impinging Normal to a Flat Surface.

Degree: PhD, Aerospace Engineering, 2015, Penn State University

URL: https://etda.libraries.psu.edu/catalog/26610

► The flow-field features of dual jet impingement were investigated through sub-scale model experiments. The experiments were designed to simulate the environment of a Short Takeoff,… (more)

▼ The flow-field features of dual jet impingement were investigated through sub-scale model experiments. The experiments were designed to simulate the environment of a Short Takeoff, and Vertical Landing, STOVL, aircraft performing a hover over the ground, at different heights. Two different dual impinging jet models were designed, fabricated, and tested. The Generation 1 Model consisted of two stainless-steel nozzles, each with an exit diameter of approximately 12.7 mm. The front convergent nozzle was operated at NPR = 1.89 (Mj = 1.0), TTR = 1.0, while the rear C-D nozzle was generally operated over a range of NPR = 1.89 to NPR = 2.93 (Mj = 1.34), TTR = 1.0. The nozzles were embedded in a rectangular flat plate, referred to as the lift plate, which represented a generic lifting surface. The lift plate was instrumented with 36 surface pressure taps, which were used to examine the flow entrainment and recirculation patterns caused by varying the stand-off distance from the nozzle exits to a flat ground surface. The stand-off distance was adjusted with a sliding rail frame that the ground plane was mounted to. Typical stand-off distances, (ground plane separation), were H/D = 2 to 24. A series of measurements were performed with the Generation 1 model, in the Penn State High Speed Jet Aeroacoustics Laboratory, to characterize the basic flow phenomena associated with dual jet impingement. The regions of interest in the flow-field included the vertical jet plume(s), near impingement/turning region, and wall jet outwash. Other aspects of interest included the loss of lift (suckdown) that occurs as the ground plane separation distance becomes small, and azimuthal variation of the acoustic noise radiation. Various experimental methods and techniques were used to characterize the flow-field, including flow-visualization, pressure rake surveys, surface mounted pressure taps, laser Doppler velocimetry, and acoustic microphone arrays. A second dual impinging jet scale model, Generation 2, was designed and fabricated with a 50% increase in nozzle exit diameter. The primary design improvement is the ability to quickly and easily exchange the nozzles of the model. This allowed experiments to be performed with rapid-prototyped nozzles that feature more realistic geometry to that of tactical military aircraft engines. One such nozzle, which was designed and demonstrated by previous researchers to reduce jet noise in a free-jet, was incorporated into the model. The nozzle, featuring deflected seals, was installed in the Generation 2 model and its effect on suckdown was evaluated.

Subjects/Keywords: STOVL Aerodynamics; V/STOL Aerodynamics; Experimental Aerodynamics; Impinging Jet; High Speed Jet

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APA (6^th Edition):

Myers, L. M. (2015). Investigation of the Flow-field of Two Parallel Round Jets Impinging Normal to a Flat Surface. (Doctoral Dissertation). Penn State University. Retrieved from https://etda.libraries.psu.edu/catalog/26610

Chicago Manual of Style (16^th Edition):

Myers, Leighton Montgomery. “Investigation of the Flow-field of Two Parallel Round Jets Impinging Normal to a Flat Surface.” 2015. Doctoral Dissertation, Penn State University. Accessed December 15, 2019. https://etda.libraries.psu.edu/catalog/26610.

MLA Handbook (7^th Edition):

Myers, Leighton Montgomery. “Investigation of the Flow-field of Two Parallel Round Jets Impinging Normal to a Flat Surface.” 2015. Web. 15 Dec 2019.

Vancouver:

Myers LM. Investigation of the Flow-field of Two Parallel Round Jets Impinging Normal to a Flat Surface. [Internet] [Doctoral dissertation]. Penn State University; 2015. [cited 2019 Dec 15]. Available from: https://etda.libraries.psu.edu/catalog/26610.

Council of Science Editors:

Myers LM. Investigation of the Flow-field of Two Parallel Round Jets Impinging Normal to a Flat Surface. [Doctoral Dissertation]. Penn State University; 2015. Available from: https://etda.libraries.psu.edu/catalog/26610

University of Windsor

8. Shademan, Mehrdad. CFD Simulation of Impinging Jet Flows and Boiling Heat Transfer.

Degree: PhD, Mechanical, Automotive, and Materials Engineering, 2015, University of Windsor

URL: http://scholar.uwindsor.ca/etd/5700

► Circular jets impinging vertically on flat surfaces have many practical applications in industry. Nozzle height-to-diameter ratio plays an important role in the performance of this… (more)

▼ Circular jets impinging vertically on flat surfaces have many practical applications in industry. Nozzle height-to-diameter ratio plays an important role in the performance of this type of jet. In this thesis a step by step approach has been followed to cover different aspects of impinging jets. In the first step, a steady Reynolds-Averaged Navier-Stokes simulation has been carried out on impinging jets with different nozzle stand-off distances. A strong dependency of the jet characteristics on the nozzle height-to-diameter ratio was observed. The simulations show that an increase in this ratio results in larger shear stress and more distributed pressure on the wall. In the second step, an unsteady simulation using Large Eddy Simulation has been performed on an impinging jet with large stand-off distance. Good agreement was observed between the mean value results obtained from the current simulations and experiments. Unlike impinging jets with small stand-off distance, where the ring-like vortices keep their interconnected shape upon reaching the plate, no sign of interconnection was observed on the plate for the large stand-off distance case. A large deflection of the jet stagnation streamline was observed in comparison to the cases with small nozzle height-to-diameter ratios. Large fluctuations of the unsteady wall shear stresses were also captured. A boiling model was developed for impinging jets with heat transfer. An Eulerian-Eulerian two-phase flow model was implemented using an open source code for the simulation (OpenFOAM). Initially, an adiabatic two-phase model was developed for flow in a pipe. Following this, the energy equation was activated to account for non-adiabatic and boiling conditions. The simulation predictions were found to be in reasonable agreement with the experimental data and show significant improvement over previous numerical results. Finally, the model was upgraded for an impinging jet flow by implementing new correlations. The results obtained from the current model show reasonable agreement with the experimental results. The model can be confidently used for the evaluation of adiabatic and non-adiabatic impinging jet flows. Advisors/Committee Members: Ronald M Barron, Ramaswami Balachandar.

Subjects/Keywords: computational fluid dynamics; fluid mechanics; impinging jet; turbulence modelling; Mechanical Engineering

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APA (6^th Edition):

Shademan, M. (2015). CFD Simulation of Impinging Jet Flows and Boiling Heat Transfer. (Doctoral Dissertation). University of Windsor. Retrieved from http://scholar.uwindsor.ca/etd/5700

Chicago Manual of Style (16^th Edition):

Shademan, Mehrdad. “CFD Simulation of Impinging Jet Flows and Boiling Heat Transfer.” 2015. Doctoral Dissertation, University of Windsor. Accessed December 15, 2019. http://scholar.uwindsor.ca/etd/5700.

MLA Handbook (7^th Edition):

Shademan, Mehrdad. “CFD Simulation of Impinging Jet Flows and Boiling Heat Transfer.” 2015. Web. 15 Dec 2019.

Vancouver:

Shademan M. CFD Simulation of Impinging Jet Flows and Boiling Heat Transfer. [Internet] [Doctoral dissertation]. University of Windsor; 2015. [cited 2019 Dec 15]. Available from: http://scholar.uwindsor.ca/etd/5700.

Council of Science Editors:

Shademan M. CFD Simulation of Impinging Jet Flows and Boiling Heat Transfer. [Doctoral Dissertation]. University of Windsor; 2015. Available from: http://scholar.uwindsor.ca/etd/5700

9. Indiana, Clément. Caractérisation expérimentale de la pulvérisation, de l'allumage et de la combustion de bi-ergols. Application à la propulsion spatiale par ergols stockables : Experimental Characterisation of the Spraying, the Ignition and, the Combustion of Bi-Propellants. Application to Space Propulsion With Storable Propellants.

Degree: Docteur es, Energétique, thermique, combustion, 2016, Chasseneuil-du-Poitou, Ecole nationale supérieure de mécanique et d'aérotechnique

URL: http://www.theses.fr/2016ESMA0025

►

Les processus physiques qui régissent la pulvérisation de sprays constituent la première étape vers une compréhension globale du comportement de moteurs fusées à ergols stockables.… (more)

▼

Les processus physiques qui régissent la pulvérisation de sprays constituent la première étape vers une compréhension globale du comportement de moteurs fusées à ergols stockables. La première partie de ces travaux détermine, au moyen de visualisations et d’analyses granulométriques, les paramètres importants contrôlant la formation de sprays par impact de jets liquides. Des injecteurs dédiés à pulvériser des ergols stockables sont ensuite conçus. L’enjeu de la seconde partie des travaux est d’étudier la combustion de l’éthanol avec le peroxyde d’hydrogène, ergols stockables considérés moins nocifs. L’utilisation de cette association bi-ergols innovante a nécessité d’analyser en détail leur compatibilité à l’allumage, ainsi que leurs performances en combustion sur la gamme de richesses 0,4 – 2,0, à l’aide de diagnostics optiques et physiques spécifiques. Les efficacités de combustion atteignent entre 87 et 98 %, les fluctuations de pression ne dépassent pas 10 %, mais les légères différences obtenues permettent de sélectionner les meilleures configurations d’injection favorisant la combustion ou sa stabilité.

The physical processes involved in spraying are the first step towards a comprehensive understanding of the behavior of rocket engines using storable propellants. The first part of this work identifies, through visualizations and particle sizing, the important parameters driving the formation of spray by impinging liquid jets. Then, injectors dedicated to spray storable green-propellants are designed. The second part of this thesis aims at studying the combustion of ethanol with hydrogen peroxide, which are regarded as green-storable propellants. But the use of this innovative bi-propellant association required a detailed analysis of their ignition compatibility, as well as their combustion performance within the range of 0,4 – 2,0 in overall equivalence ratio. Specific optical and physical diagnostics helped to achieve these goals. Combustion efficiency reached between 87 and 98 %, pressure fluctuations did not exceed 10 %, but the slight differences obtained allowed to select the best injection configurations promoting efficient combustion and stability.

Advisors/Committee Members: Bellenoue, Marc (thesis director), Boust, Bastien (thesis director).

Subjects/Keywords: Ergols stockables; Injecteurs à impact; Staorable propellants; Impinging-jet injectors

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APA (6^th Edition):

Indiana, C. (2016). Caractérisation expérimentale de la pulvérisation, de l'allumage et de la combustion de bi-ergols. Application à la propulsion spatiale par ergols stockables : Experimental Characterisation of the Spraying, the Ignition and, the Combustion of Bi-Propellants. Application to Space Propulsion With Storable Propellants. (Doctoral Dissertation). Chasseneuil-du-Poitou, Ecole nationale supérieure de mécanique et d'aérotechnique. Retrieved from http://www.theses.fr/2016ESMA0025

Chicago Manual of Style (16^th Edition):

Indiana, Clément. “Caractérisation expérimentale de la pulvérisation, de l'allumage et de la combustion de bi-ergols. Application à la propulsion spatiale par ergols stockables : Experimental Characterisation of the Spraying, the Ignition and, the Combustion of Bi-Propellants. Application to Space Propulsion With Storable Propellants.” 2016. Doctoral Dissertation, Chasseneuil-du-Poitou, Ecole nationale supérieure de mécanique et d'aérotechnique. Accessed December 15, 2019. http://www.theses.fr/2016ESMA0025.

MLA Handbook (7^th Edition):

Indiana, Clément. “Caractérisation expérimentale de la pulvérisation, de l'allumage et de la combustion de bi-ergols. Application à la propulsion spatiale par ergols stockables : Experimental Characterisation of the Spraying, the Ignition and, the Combustion of Bi-Propellants. Application to Space Propulsion With Storable Propellants.” 2016. Web. 15 Dec 2019.

Vancouver:

Indiana C. Caractérisation expérimentale de la pulvérisation, de l'allumage et de la combustion de bi-ergols. Application à la propulsion spatiale par ergols stockables : Experimental Characterisation of the Spraying, the Ignition and, the Combustion of Bi-Propellants. Application to Space Propulsion With Storable Propellants. [Internet] [Doctoral dissertation]. Chasseneuil-du-Poitou, Ecole nationale supérieure de mécanique et d'aérotechnique; 2016. [cited 2019 Dec 15]. Available from: http://www.theses.fr/2016ESMA0025.

Council of Science Editors:

Indiana C. Caractérisation expérimentale de la pulvérisation, de l'allumage et de la combustion de bi-ergols. Application à la propulsion spatiale par ergols stockables : Experimental Characterisation of the Spraying, the Ignition and, the Combustion of Bi-Propellants. Application to Space Propulsion With Storable Propellants. [Doctoral Dissertation]. Chasseneuil-du-Poitou, Ecole nationale supérieure de mécanique et d'aérotechnique; 2016. Available from: http://www.theses.fr/2016ESMA0025

University of Manchester

10. Garlick, Matthew Liam. Modelling and simulation of single and multi-phase impinging jets.

Degree: Thesis (Eng.D.), 2015, University of Manchester

URL: https://www.research.manchester.ac.uk/portal/en/theses/modelling-and-simulation-of-single-and-multiphase-impinging-jets(9c105a0a-7e42-47d0-b9a4-66987d715102).html ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.692595

► Impinging jets are a flow geometry that is of interest in many chemical and processing engineering applications for a wide range of industries. Of particular… (more)

▼ Impinging jets are a flow geometry that is of interest in many chemical and processing engineering applications for a wide range of industries. Of particular interest in the current research is their application to particle re-suspension in nuclear reprocessing activities such as the HAS (highly active storage) tanks at Sellafield, UK. The challenging nature of these operations and their environment means that in-situ experimental work is impossible. Therefore, when designing and optimising equipment such as HAS tanks, engineers often turn to computational modelling to help gain an understanding about what effects certain modifications may have on the performance of the jet. The challenge then becomes obtaining physically realistic predictions using the methods available to industry. Impinging jets are complex and complicated flow geometries that have caused a number of problems for computational modellers over the years. Indeed, several turbulence models and approaches have been developed specifically with impinging jets in mind to help overcome some of the more difficult aspects of the flow. The work presented herein compares Reynolds-averaged Navier-Stokes (RANS) commercial codes readily available to industrial users for single- and multi-phase flows with RANS and large eddy simulation (LES) codes developed in an academic research environment. The intention is to contrast and compare and highlight where industrial-based computational models fall short and how these might be improved through implementing schemes with fewer simplified terms. The work conducted for this Engineering Doctorate has modelled a series of impinging jets with varying jet heights and Reynolds numbers using a range of RANS turbulence models within commercial and academic-based codes. This allows not only the discussion of the performance of the applied turbulence models, but also the effects of varying jet height. The predictions are validated against available experimental data for assessment of the performance of the scheme used. The degree of alignment with real, physical data is an indication of the performance of a model and is used to conclude where a particular model has failed or whether it is more suited than another. Different particle sizes have also been considered to determine the ability of different particle tracking schemes to predict particle behaviour based on their response to the continuous phase. Multi-phase data is also validated against limited available experimental data. Finally, LES has been used to demonstrate the next step in complexity in terms of simulation and prediction of continuous phase flows in difficult engineering applications and how these can greatly improve upon predictions from RANS methods.

Subjects/Keywords: 629.132; turbulence modelling; impinging jet; cfd; les; single-phase; multi-phase

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

APA (6^th Edition):

Garlick, M. L. (2015). Modelling and simulation of single and multi-phase impinging jets. (Doctoral Dissertation). University of Manchester. Retrieved from https://www.research.manchester.ac.uk/portal/en/theses/modelling-and-simulation-of-single-and-multiphase-impinging-jets(9c105a0a-7e42-47d0-b9a4-66987d715102).html ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.692595

Chicago Manual of Style (16^th Edition):

Garlick, Matthew Liam. “Modelling and simulation of single and multi-phase impinging jets.” 2015. Doctoral Dissertation, University of Manchester. Accessed December 15, 2019. https://www.research.manchester.ac.uk/portal/en/theses/modelling-and-simulation-of-single-and-multiphase-impinging-jets(9c105a0a-7e42-47d0-b9a4-66987d715102).html ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.692595.

MLA Handbook (7^th Edition):

Garlick, Matthew Liam. “Modelling and simulation of single and multi-phase impinging jets.” 2015. Web. 15 Dec 2019.

Vancouver:

Garlick ML. Modelling and simulation of single and multi-phase impinging jets. [Internet] [Doctoral dissertation]. University of Manchester; 2015. [cited 2019 Dec 15]. Available from: https://www.research.manchester.ac.uk/portal/en/theses/modelling-and-simulation-of-single-and-multiphase-impinging-jets(9c105a0a-7e42-47d0-b9a4-66987d715102).html ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.692595.

Council of Science Editors:

Garlick ML. Modelling and simulation of single and multi-phase impinging jets. [Doctoral Dissertation]. University of Manchester; 2015. Available from: https://www.research.manchester.ac.uk/portal/en/theses/modelling-and-simulation-of-single-and-multiphase-impinging-jets(9c105a0a-7e42-47d0-b9a4-66987d715102).html ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.692595

University of Manchester

11. Garlick, Matthew Liam. Modelling and simulation of single and multi-phase impinging jets.

Degree: 2015, University of Manchester

URL: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:268318

► Title: “Modelling and simulation of single- and multi-phase impinging jets”Impinging jets are a flow geometry that is of interest in many chemical and processing engineering… (more)

▼ Title: “Modelling and simulation of single- and multi-phase impinging jets”Impinging jets are a flow geometry that is of interest in many chemical and processing engineering applications for a wide range of industries. Of particular interest in the current research is their application to particle re-suspension in nuclear reprocessing activities such as the HAS (highly active storage) tanks at Sellafield, UK. The challenging nature of these operations and their environment means that in-situ experimental work is impossible. Therefore, when designing and optimising equipment such as HAS tanks, engineers often turn to computational modelling to help gain an understanding about what effects certain modifications may have on the performance of the jet. The challenge then becomes obtaining physically realistic predictions using the methods available to industry.Impinging jets are complex and complicated flow geometries that have caused a number of problems for computational modellers over the years. Indeed, several turbulence models and approaches have been developed specifically with impinging jets in mind to help overcome some of the more difficult aspects of the flow. The work presented herein compares Reynolds-averaged Navier-Stokes (RANS) commercial codes readily available to industrial users for single- and multi-phase flows with RANS and large eddy simulation (LES) codes developed in an academic research environment. The intention is to contrast and compare and highlight where industrial-based computational models fall short and how these might be improved through implementing schemes with fewer simplified terms.The work conducted for this Engineering Doctorate has modelled a series of impinging jets with varying jet heights and Reynolds numbers using a range of RANS turbulence models within commercial and academic-based codes. This allows not only the discussion of the performance of the applied turbulence models, but also the effects of varying jet height. The predictions are validated against available experimental data for assessment of the performance of the scheme used. The degree of alignment with real, physical data is an indication of the performance of a model and is used to conclude where a particular model has failed or whether it is more suited than another. Different particle sizes have also been considered to determine the ability of different particle tracking schemes to predict particle behaviour based on their response to the continuous phase. Multi-phase data is also validated against limited available experimental data. Finally, LES has been used to demonstrate the next step in complexity in terms of simulation and prediction of continuous phase flows in difficult engineering applications and how these can greatly improve upon predictions from RANS methods. Advisors/Committee Members: Craft, Timothy.

Subjects/Keywords: turbulence modelling; impinging jet; cfd; les; single-phase; multi-phase

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

APA (6^th Edition):

Garlick, M. L. (2015). Modelling and simulation of single and multi-phase impinging jets. (Doctoral Dissertation). University of Manchester. Retrieved from http://www.manchester.ac.uk/escholar/uk-ac-man-scw:268318

Chicago Manual of Style (16^th Edition):

Garlick, Matthew Liam. “Modelling and simulation of single and multi-phase impinging jets.” 2015. Doctoral Dissertation, University of Manchester. Accessed December 15, 2019. http://www.manchester.ac.uk/escholar/uk-ac-man-scw:268318.

MLA Handbook (7^th Edition):

Garlick, Matthew Liam. “Modelling and simulation of single and multi-phase impinging jets.” 2015. Web. 15 Dec 2019.

Vancouver:

Garlick ML. Modelling and simulation of single and multi-phase impinging jets. [Internet] [Doctoral dissertation]. University of Manchester; 2015. [cited 2019 Dec 15]. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:268318.

Council of Science Editors:

Garlick ML. Modelling and simulation of single and multi-phase impinging jets. [Doctoral Dissertation]. University of Manchester; 2015. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:268318

Delft University of Technology

12. Van der Steen, M. Flame-wall interaction of a flame jet impinging normally on a cooled cylinder:.

Degree: 2014, Delft University of Technology

URL: http://resolver.tudelft.nl/uuid:21eef6ec-2f7d-42f4-8752-87308486c599

► The main objective of the present experimental investigation is to study the turbulent reacting flow field in the region where a stable premixed flame jet… (more)

Subjects/Keywords: combustion; PIV; flame-wall interaction; Reynolds stress; impinging jet

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APA (6^th Edition):

Van der Steen, M. (2014). Flame-wall interaction of a flame jet impinging normally on a cooled cylinder:. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:21eef6ec-2f7d-42f4-8752-87308486c599

Chicago Manual of Style (16^th Edition):

Van der Steen, M. “Flame-wall interaction of a flame jet impinging normally on a cooled cylinder:.” 2014. Masters Thesis, Delft University of Technology. Accessed December 15, 2019. http://resolver.tudelft.nl/uuid:21eef6ec-2f7d-42f4-8752-87308486c599.

MLA Handbook (7^th Edition):

Van der Steen, M. “Flame-wall interaction of a flame jet impinging normally on a cooled cylinder:.” 2014. Web. 15 Dec 2019.

Vancouver:

Van der Steen M. Flame-wall interaction of a flame jet impinging normally on a cooled cylinder:. [Internet] [Masters thesis]. Delft University of Technology; 2014. [cited 2019 Dec 15]. Available from: http://resolver.tudelft.nl/uuid:21eef6ec-2f7d-42f4-8752-87308486c599.

Council of Science Editors:

Van der Steen M. Flame-wall interaction of a flame jet impinging normally on a cooled cylinder:. [Masters Thesis]. Delft University of Technology; 2014. Available from: http://resolver.tudelft.nl/uuid:21eef6ec-2f7d-42f4-8752-87308486c599

University of Windsor

13. Shademan, Mehrdad. CFD Simulation of Impinging Jet Flows and Boiling Heat Transfer.

Degree: PhD, Mechanical, Automotive, and Materials Engineering, 2015, University of Windsor

URL: https://scholar.uwindsor.ca/etd/5700

► Circular jets impinging vertically on flat surfaces have many practical applications in industry. Nozzle height-to-diameter ratio plays an important role in the performance of this… (more)

▼ Circular jets impinging vertically on flat surfaces have many practical applications in industry. Nozzle height-to-diameter ratio plays an important role in the performance of this type of jet. In this thesis a step by step approach has been followed to cover different aspects of impinging jets. In the first step, a steady Reynolds-Averaged Navier-Stokes simulation has been carried out on impinging jets with different nozzle stand-off distances. A strong dependency of the jet characteristics on the nozzle height-to-diameter ratio was observed. The simulations show that an increase in this ratio results in larger shear stress and more distributed pressure on the wall. In the second step, an unsteady simulation using Large Eddy Simulation has been performed on an impinging jet with large stand-off distance. Good agreement was observed between the mean value results obtained from the current simulations and experiments. Unlike impinging jets with small stand-off distance, where the ring-like vortices keep their interconnected shape upon reaching the plate, no sign of interconnection was observed on the plate for the large stand-off distance case. A large deflection of the jet stagnation streamline was observed in comparison to the cases with small nozzle height-to-diameter ratios. Large fluctuations of the unsteady wall shear stresses were also captured. A boiling model was developed for impinging jets with heat transfer. An Eulerian-Eulerian two-phase flow model was implemented using an open source code for the simulation (OpenFOAM). Initially, an adiabatic two-phase model was developed for flow in a pipe. Following this, the energy equation was activated to account for non-adiabatic and boiling conditions. The simulation predictions were found to be in reasonable agreement with the experimental data and show significant improvement over previous numerical results. Finally, the model was upgraded for an impinging jet flow by implementing new correlations. The results obtained from the current model show reasonable agreement with the experimental results. The model can be confidently used for the evaluation of adiabatic and non-adiabatic impinging jet flows. Advisors/Committee Members: Ronald M Barron, Ramaswami Balachandar.

Subjects/Keywords: computational fluid dynamics; fluid mechanics; impinging jet; turbulence modelling; Mechanical Engineering

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

APA (6^th Edition):

Shademan, M. (2015). CFD Simulation of Impinging Jet Flows and Boiling Heat Transfer. (Doctoral Dissertation). University of Windsor. Retrieved from https://scholar.uwindsor.ca/etd/5700

Chicago Manual of Style (16^th Edition):

Shademan, Mehrdad. “CFD Simulation of Impinging Jet Flows and Boiling Heat Transfer.” 2015. Doctoral Dissertation, University of Windsor. Accessed December 15, 2019. https://scholar.uwindsor.ca/etd/5700.

MLA Handbook (7^th Edition):

Shademan, Mehrdad. “CFD Simulation of Impinging Jet Flows and Boiling Heat Transfer.” 2015. Web. 15 Dec 2019.

Vancouver:

Shademan M. CFD Simulation of Impinging Jet Flows and Boiling Heat Transfer. [Internet] [Doctoral dissertation]. University of Windsor; 2015. [cited 2019 Dec 15]. Available from: https://scholar.uwindsor.ca/etd/5700.

Council of Science Editors:

Shademan M. CFD Simulation of Impinging Jet Flows and Boiling Heat Transfer. [Doctoral Dissertation]. University of Windsor; 2015. Available from: https://scholar.uwindsor.ca/etd/5700

14. Weinberger, Gottfried. Experimental and numerical study of entrainment phenomena in an impinging jet.

Degree: Faculty of Engineering and Sustainable Development, 2010, University of Gävle

URL: http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-8198

►

This thesis is primarily about the mapping and analyze of the phenomenon of an impinging jet by experimental measurements and numerical simulations by CFD.… (more)

▼

This thesis is primarily about the mapping and analyze of the phenomenon of an impinging jet by experimental measurements and numerical simulations by CFD. The mapping shows the characteristics of velocity in and around the impinging jet with different conditions. Additional studies were made by analyzing the pressure along the vertical jet axis, but also weight measurements were part of the investigation. The measurements covered the range from 10 m/s, 20 m/s and 30 m/s, which corresponds to a Reynolds number of 17 000, 34 000 and 50 000. The impinging jet is therefore considered to be highly turbulent. The main difference from previous studies is the use of the ultrasonic anemometer to measure the velocities. These create the ability of measuring the velocities on three coordinates. The jet’s contour was crucial to determine the penetration of ambient air flowing into the jet with an angle of around 88° and the entrainment of the ambient air multiple the jet volume flow. In comparison with CFD, the number of cells in the mesh design and the type of model plays a substantial role. The model k-ε Realized came closest to the experimentally measurements, while the SST k-ω and RNG k-ε EWF had far more entrainment of the ambient air into the impinging jet.

Detta examensarbete handlar om att kartlägga och analysera fenomenet av en ”impinging jet” genom experimentella mätningar samt numeriska simuleringar som CFD. Undersökningen visar karakteristiken av hastigheten i och kring strålen med olika förutsättningar. Kompletterande undersökningar gjordes för trycket i luftstrålens centrum längs den vertikala axeln, men även viktmätningar var del av undersökningen. Mätningarna omfattade hastigheter från 10 m/s, 20 m/s och 30 m/s som motsvarar ett Reynoldstal med 17 000, 34 000 och 50 000. Luftstrålen betraktas därför som turbulent. Det som skiljer sig från tidigare experiment är att hastigheten mättes med en ultrasonic anemometer som egentligen används inom metrologin för att mäta vindhastigheter. Därmed skapades en tredimensionell bild av hastigheten i och kring luftstrålen. Mätområdet sträckte sig från strålens utgångspunkt ner till strax ovanför plattan. Luftstrålens fastställda kontur var avgörande för att bestämma den inträngande omgivningsluften som strömmar in i strålen med en genomsnittlig vinkel av 88°. Denna inströmmande omgivningsluft flerfaldigade strålens volym. I jämförelse med CFD simuleringen visades att antal celler i meshen är avgörande för att skapa liknande och reala förutsättningar. Vid undersökningen av den inträngande omgivningsluften visades även att själva modellen spelar en avgörande roll. Det var modellen k-ε Realized som kom närmast mätningarna. Däremot uppvisade SST k-ω och RNG k-ε EWF modellerna mycket mer inträngande omgivningsluft i jämförelse med mätningarnas resultat.

Subjects/Keywords: Impinging jet; ultrasonic anemometer; CFD; entrainment angle; jet angle; jet contour; relative volume flux; spreading rate

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

APA (6^th Edition):

Weinberger, G. (2010). Experimental and numerical study of entrainment phenomena in an impinging jet. (Thesis). University of Gävle. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-8198

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):

Weinberger, Gottfried. “Experimental and numerical study of entrainment phenomena in an impinging jet.” 2010. Thesis, University of Gävle. Accessed December 15, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-8198.

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

MLA Handbook (7^th Edition):

Weinberger, Gottfried. “Experimental and numerical study of entrainment phenomena in an impinging jet.” 2010. Web. 15 Dec 2019.

Vancouver:

Weinberger G. Experimental and numerical study of entrainment phenomena in an impinging jet. [Internet] [Thesis]. University of Gävle; 2010. [cited 2019 Dec 15]. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-8198.

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

Council of Science Editors:

Weinberger G. Experimental and numerical study of entrainment phenomena in an impinging jet. [Thesis]. University of Gävle; 2010. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-8198

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

Indian Institute of Science

15. Sanyal, Anuradha. Numerical Study Of Heat Transfer From Pin Fin Heat Sink Using Steady And Pulsated Impinging Jets.

Degree: 2006, Indian Institute of Science

URL: http://hdl.handle.net/2005/351

► The work reported in this thesis is an attempt to enhance heat transfer in electronic devices with the use of impinging air jets on pin-ﬁnned… (more)

▼ The work reported in this thesis is an attempt to enhance heat transfer in electronic devices with the use of impinging air jets on pin-ﬁnned heat sinks. The cooling per-formance of electronic devices has attracted increased attention owing to the demand of compact size, higher power densities and demands on system performance and re-liability. Although the technology of cooling has greatly advanced, the main cause of malfunction of the electronic devices remains overheating. The problem arises due to restriction of space and also due to high heat dissipation rates, which have increased from a fraction of a W/cm2to 100s of W /cm2. Although several researchers have at-tempted to address this at the design stage, unfortunately the speed of invention of cooling mechanism has not kept pace with the ever-increasing requirement of heat re- moval from electronic chips. As a result, efﬁcient cooling of electronic chip remains a challenge in thermal engineering. Heat transfer can be enhanced by several ways like air cooling, liquid cooling, phase change cooling etc. However, in certain applications due to limitations on cost and weight, eg. air borne application, air cooling is imperative. The heat transfer can be increased by two ways. First, increasing the heat transfer coefﬁcient (forced convec- tion), and second, increasing the surface area of heat transfer (ﬁnned heat sinks). From previous literature it was established that for a given volumetric air ﬂow rate, jet im-pingement is the best option for enhancing heat transfer coefﬁcient and for a given volume of heat sink material pin-ﬁnned heat sinks are the best option because of their high surface area to volume ratio. There are certain applications where very high jet velocities cannot be used because of limitations of noise and presence of delicate components. This process can further be improved by pulsating the jet. A steady jet often stabilizes the boundary layer on the surface to be cooled. Enhancement in the convective heat transfer can be achieved if the boundary layer is broken. Disruptions in the boundary layer can be caused by pulsating the impinging jet, i.e., making the jet unsteady. Besides, the pulsations lead to chaotic mixing, i.e., the ﬂuid particles no more follow well deﬁned streamlines but move unpredictably through the stagnation region. Thus the ﬂow mimics turbulence at low Reynolds number. The pulsation should be done in such a way that the boundary layer can be disturbed periodically and yet adequate coolant is made available. So, that there is not much variation in temperature during one pulse cycle. From previous literature it was found that square waveform is most effective in enhancing heat transfer. In the present study the combined effect of pin-ﬁnned heat sink and impinging slot jet, both steady and unsteady, has been investigated for both laminar and turbulent ﬂows. The effect of ﬁn height and height of impingement has been studied. The jets have been pulsated in square waveform to study the effect of frequency and duty cycle. This… Advisors/Committee Members: Dutta, Pradip, Srinivasan, K.

Subjects/Keywords: Heat Transmission; Numerical Analysis; Electronic Cooling; Steady Impinging Jet; Pulsated Impinging Jet; Heat Sinks; Electronics - Thermal Management; Heat Transfer; Heat Sink Spacing; Pin Fin; Heat Engineering

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APA (6^th Edition):

Sanyal, A. (2006). Numerical Study Of Heat Transfer From Pin Fin Heat Sink Using Steady And Pulsated Impinging Jets. (Thesis). Indian Institute of Science. Retrieved from http://hdl.handle.net/2005/351

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):

Sanyal, Anuradha. “Numerical Study Of Heat Transfer From Pin Fin Heat Sink Using Steady And Pulsated Impinging Jets.” 2006. Thesis, Indian Institute of Science. Accessed December 15, 2019. http://hdl.handle.net/2005/351.

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

MLA Handbook (7^th Edition):

Sanyal, Anuradha. “Numerical Study Of Heat Transfer From Pin Fin Heat Sink Using Steady And Pulsated Impinging Jets.” 2006. Web. 15 Dec 2019.

Vancouver:

Sanyal A. Numerical Study Of Heat Transfer From Pin Fin Heat Sink Using Steady And Pulsated Impinging Jets. [Internet] [Thesis]. Indian Institute of Science; 2006. [cited 2019 Dec 15]. Available from: http://hdl.handle.net/2005/351.

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

Council of Science Editors:

Sanyal A. Numerical Study Of Heat Transfer From Pin Fin Heat Sink Using Steady And Pulsated Impinging Jets. [Thesis]. Indian Institute of Science; 2006. Available from: http://hdl.handle.net/2005/351

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

McMaster University

16. Alibeigi, Sepideh. Experimental Investigation of Air-Knife Geometry in Continuous Hot-Dip Galvanizing.

Degree: MSME, 2013, McMaster University

URL: http://hdl.handle.net/11375/15314

►

This thesis investigates the wall pressure distributions of the single-slot impinging jet and multiple-slot impinging jet as a function of various parameters and compares… (more)

▼

This thesis investigates the wall pressure distributions of the single-slot impinging jet and multiple-slot impinging jet as a function of various parameters and compares the results obtained with the computational study of Tamadonfar [2010]. The process of gas wiping is used in many industrial applications such as tempering of the plate glass, the chemical mixing process, and turbine blade cooling. One of the most important industrial applications of gas jet wiping is the production of galvanized steel strip in a continuous hot-dip galvanizing line. In this process, an impinging jet is used to remove the excess zinc alloy from the steel strip and control the final coating weight by applying wall pressure and shear stress on the moving substrate emerging from the bath of molten zinc. Changing the various operating parameters such as jet Reynolds number (Re), the jet to strip distance (z), the jet slot width (d), and jet inclination angles (α) allows manufacturers manipulate the final coating weight on the substrate. Production of high quality sheet steels, which have a very thin coating weight and high uniformity quality, is one of the goals of the automotive industry. In order to obtain thinner and more uniform coating weight, a new model of impinging jet which is comprised of one main jet with two auxiliary jets, one on each side of the main jet, called a multiple-slot impinging jet, is of considerable interest. For the current study, a multiple-slot impinging jet was designed and manufactured and measurements were performed for both the single-slot impinging jets, the current model used in continuous hot-dip galvanizing lines, and the multiple-slot impinging jet subjected to a wide range of gas wiping parameters which include the main jet Reynolds number (<em>Re_m</em>), the auxiliary jet Reynolds number (<em>Re_a</em>), and the plate-to-nozzle ratio (z/d). A comparison between the measured results obtained for the two impinging jet configurations and the numerical results by Tamadonfar [2010] has been provided. The similarities and differences between the experimental and numerical results are presented and discussed.

Master of Science in Mechanical Engineering (MSME)

Advisors/Committee Members: McDermid, Joseph R., Ziada, Samir, Mechanical Engineering.

Subjects/Keywords: Multiple-Slot Impinging Jet; Single-Slot Impinging Jet; Galvanizing; Coating Thickness; Other Materials Science and Engineering; Other Mechanical Engineering; Other Materials Science and Engineering

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APA (6^th Edition):

Alibeigi, S. (2013). Experimental Investigation of Air-Knife Geometry in Continuous Hot-Dip Galvanizing. (Masters Thesis). McMaster University. Retrieved from http://hdl.handle.net/11375/15314

Chicago Manual of Style (16^th Edition):

Alibeigi, Sepideh. “Experimental Investigation of Air-Knife Geometry in Continuous Hot-Dip Galvanizing.” 2013. Masters Thesis, McMaster University. Accessed December 15, 2019. http://hdl.handle.net/11375/15314.

MLA Handbook (7^th Edition):

Alibeigi, Sepideh. “Experimental Investigation of Air-Knife Geometry in Continuous Hot-Dip Galvanizing.” 2013. Web. 15 Dec 2019.

Vancouver:

Alibeigi S. Experimental Investigation of Air-Knife Geometry in Continuous Hot-Dip Galvanizing. [Internet] [Masters thesis]. McMaster University; 2013. [cited 2019 Dec 15]. Available from: http://hdl.handle.net/11375/15314.

Council of Science Editors:

Alibeigi S. Experimental Investigation of Air-Knife Geometry in Continuous Hot-Dip Galvanizing. [Masters Thesis]. McMaster University; 2013. Available from: http://hdl.handle.net/11375/15314

University of Alberta

17. Siddiqui, Shad Waheed. Use of the Confined Impinging Jet Reactor for production of nanoscale Iron Oxide particles.

Degree: PhD, Department of Chemical and Materials Engineering, 2009, University of Alberta

URL: https://era.library.ualberta.ca/files/bg257f798

► The confined impinging jet reactor gives efficient mixing performance as required for fast reactions. In this work the mixing performance of CIJR is characterized through… (more)

▼ The confined impinging jet reactor gives efficient mixing performance as required for fast reactions. In this work the mixing performance of CIJR is characterized through three measures: estimates of the energy dissipation, micromixing efficiency based on the yield of a homogeneous (iodide-iodate) reaction and particle size resulting from a heterogeneous (iron oxide) precipitation reaction. Whereas product yield and energy dissipation are used to test operational robustness of CIJR, iron oxide model system is used to study the effect of feed flow rate (mixing) and reactant concentration on precipitate agglomerate size. Mixing and concentration effects on nucleation, particle growth and particle agglomeration are tracked to understand the agglomeration process. Various types of stabilizers and additive concentrations to limit particle agglomeration are also tested. Effects of in situ and post-reaction sonication on agglomerate size are also investigated. Efforts are made to determine variations in mixing efficiency the operational robustness of the scale-up (2X and 4X) geometries. Also efforts are made to identify scaling parameters and the limit on geometric scale-up for good mixing performance. Energy dissipation is found to vary between 20 W/kg and 6800 W/kg in CIJR and decreases on scale-up at constant Reynolds number. The operation of the CIJR and the scale-up geometries is robust to changes in flow rate, exhibiting stable performance up to 30% difference in inlet flow rates. Reliable mixing performance is obtained until 2X scale-up, while at low flow rates, the jets fail to impinge in 4X scale-up, and sometimes failing to fill the reactor volume. Iron oxide primary and agglomerate particles are seen to vary with flow rate and reactant concentrations. Largest primary particles (and smallest agglomerates) are obtained at high flow rates and high reactant concentrations, which indicate to size dependent agglomerative tendency of the primary particles. Stabilizers added in situ see limited success. Post-reaction sonication is helpful in dispersing soft agglomerates, but in situ sonication shows no significant reduction in agglomerate size with or without stabilizer. Primary particles are understood to agglomerate due to collisions induced by Brownian motion, simple shear and velocity fluctuations in turbulent flows. These collision mechanisms operate at different length scales in the fluid mass.

Subjects/Keywords: Nucleation; Nanoparticle; Energy dissipation; Mixing; Agglomeration; Precipitation reaction; Confined Impinging Jet Reactor; Particle growth

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APA (6^th Edition):

Siddiqui, S. W. (2009). Use of the Confined Impinging Jet Reactor for production of nanoscale Iron Oxide particles. (Doctoral Dissertation). University of Alberta. Retrieved from https://era.library.ualberta.ca/files/bg257f798

Chicago Manual of Style (16^th Edition):

Siddiqui, Shad Waheed. “Use of the Confined Impinging Jet Reactor for production of nanoscale Iron Oxide particles.” 2009. Doctoral Dissertation, University of Alberta. Accessed December 15, 2019. https://era.library.ualberta.ca/files/bg257f798.

MLA Handbook (7^th Edition):

Siddiqui, Shad Waheed. “Use of the Confined Impinging Jet Reactor for production of nanoscale Iron Oxide particles.” 2009. Web. 15 Dec 2019.

Vancouver:

Siddiqui SW. Use of the Confined Impinging Jet Reactor for production of nanoscale Iron Oxide particles. [Internet] [Doctoral dissertation]. University of Alberta; 2009. [cited 2019 Dec 15]. Available from: https://era.library.ualberta.ca/files/bg257f798.

Council of Science Editors:

Siddiqui SW. Use of the Confined Impinging Jet Reactor for production of nanoscale Iron Oxide particles. [Doctoral Dissertation]. University of Alberta; 2009. Available from: https://era.library.ualberta.ca/files/bg257f798

Delft University of Technology

18. Ismail, U. Turbulence Modeling of Wall Jets using the Algebraic Structure Based Model:.

Degree: 2014, Delft University of Technology

URL: http://resolver.tudelft.nl/uuid:e566a5a1-e9ea-4ac2-8538-c08c3c20bf9f

► Report PRE-2628. The Algebraic Structure Based Model (ASBM) of Langer and Reynolds (2003) provides an innovative approach for modeling the turbulent stresses, while incorporating information… (more)

Subjects/Keywords: turbulence; turbulence modeling; RANS; wall jets; impinging jet; ASBM; structure based modeling; v2f

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APA (6^th Edition):

Ismail, U. (2014). Turbulence Modeling of Wall Jets using the Algebraic Structure Based Model:. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:e566a5a1-e9ea-4ac2-8538-c08c3c20bf9f

Chicago Manual of Style (16^th Edition):

Ismail, U. “Turbulence Modeling of Wall Jets using the Algebraic Structure Based Model:.” 2014. Masters Thesis, Delft University of Technology. Accessed December 15, 2019. http://resolver.tudelft.nl/uuid:e566a5a1-e9ea-4ac2-8538-c08c3c20bf9f.

MLA Handbook (7^th Edition):

Ismail, U. “Turbulence Modeling of Wall Jets using the Algebraic Structure Based Model:.” 2014. Web. 15 Dec 2019.

Vancouver:

Ismail U. Turbulence Modeling of Wall Jets using the Algebraic Structure Based Model:. [Internet] [Masters thesis]. Delft University of Technology; 2014. [cited 2019 Dec 15]. Available from: http://resolver.tudelft.nl/uuid:e566a5a1-e9ea-4ac2-8538-c08c3c20bf9f.

Council of Science Editors:

Ismail U. Turbulence Modeling of Wall Jets using the Algebraic Structure Based Model:. [Masters Thesis]. Delft University of Technology; 2014. Available from: http://resolver.tudelft.nl/uuid:e566a5a1-e9ea-4ac2-8538-c08c3c20bf9f

University of Waterloo

19. Abdulkadhim, Ali. Solid-Particles Deposition Through a Turbulent Impinging Jet Using Lattice Boltzmann Method.

Degree: 2018, University of Waterloo

URL: http://hdl.handle.net/10012/14079

► Solid particle distribution on an impingement surface has been simulated utilizing a graphical processing unit (GPU). An in-house computational fluid dynamics (CFD) code has been… (more)

▼ Solid particle distribution on an impingement surface has been simulated utilizing a graphical processing unit (GPU). An in-house computational fluid dynamics (CFD) code has been developed to investigate a 3D turbulent impinging jet using the lattice Boltzmann method (LBM) in conjunction with large eddy simulation (LES) and the multiple relaxation time (MRT) models. This work proposed an improvement in the LBM-cellular automata (LBM-CA) probabilistic method. In the current model, the fluid flow utilizes the D3Q19 LBM lattice model, while the particles movement employs the D3Q27 one. The particle numbers are defined at the same regular LBM (fluid) nodes, and the transport of particles from one node to its neighbouring nodes are determined in accordance with the particle bulk density and velocity by considering all the external forces. The previous CA models distribute particles at each time step without considering the local particles number and velocity at each node. The present model overcomes the deficiencies of the previous LBM-CA models and, therefore, can better capture the dynamic interaction between particles and the surrounding turbulent flow field. Despite increasing popularity of the LBM-MRT model in simulating complex multiphase fluid flows, this approach is still expensive in term of memory size and computational time required to perform 3D simulations. To improve the throughput of simulations, a single GeForce GTX TITAN X GPU is used in the present work. The CUDA parallel programming platform and the CuRAND library are utilized to form an efficient LBM-MRT-CA algorithm. The LBM-MRT fluid (i.e. no particles) model results were compared with two benchmark test cases ones. The first case is a turbulent free square jet, and the second one is a circular turbulent impinging jet for L/D=2 at Reynolds number equals to 25,000, where L is the nozzle-to-surface distance and D is the jet diameter. The LBM-CA simulation methodology was first validated against a benchmark test case involving particle deposition on a square cylinder confined in a duct. The flow was unsteady and laminar at Re=200 (Re is the Reynolds number), and simulations were conducted for different Stokes numbers. The GPU code was then used to simulate the particle transport and deposition in a turbulent impinging jet at Re=10,000. The effect of changing Stokes number on the particle deposition profile was studied at different L/D ratios, i.e. L/D=2, 4, and 6. The current model was finally used to simulate the particle impaction pattern from a circular jet for L/D=0.5, where the effect of changing Stokes and Reynolds numbers on the particle transport and deposition was examined. The present LBM-CA solutions agree well with other results available in the open literature. For comparative studies, another in-house serial CPU code was also developed, coupling LBM with the classical Lagrangian particle dispersion model. Agreement between results obtained with LBM-CA and LBM-Lagrangian models and the experimental data for…

Subjects/Keywords: CUDA GPU programming; Large Eddy Simulation; Lattice Boltzmann method; Turbulent impinging jet.; Parallel computing

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APA (6^th Edition):

Abdulkadhim, A. (2018). Solid-Particles Deposition Through a Turbulent Impinging Jet Using Lattice Boltzmann Method. (Thesis). University of Waterloo. Retrieved from http://hdl.handle.net/10012/14079

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):

Abdulkadhim, Ali. “Solid-Particles Deposition Through a Turbulent Impinging Jet Using Lattice Boltzmann Method.” 2018. Thesis, University of Waterloo. Accessed December 15, 2019. http://hdl.handle.net/10012/14079.

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

MLA Handbook (7^th Edition):

Abdulkadhim, Ali. “Solid-Particles Deposition Through a Turbulent Impinging Jet Using Lattice Boltzmann Method.” 2018. Web. 15 Dec 2019.

Vancouver:

Abdulkadhim A. Solid-Particles Deposition Through a Turbulent Impinging Jet Using Lattice Boltzmann Method. [Internet] [Thesis]. University of Waterloo; 2018. [cited 2019 Dec 15]. Available from: http://hdl.handle.net/10012/14079.

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

Council of Science Editors:

Abdulkadhim A. Solid-Particles Deposition Through a Turbulent Impinging Jet Using Lattice Boltzmann Method. [Thesis]. University of Waterloo; 2018. Available from: http://hdl.handle.net/10012/14079

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

University of Illinois – Urbana-Champaign

20. Zhou, Lifang. Optimal Control of Antisolvent and Cooling Crystallization.

Degree: MS, 0300, 2011, University of Illinois – Urbana-Champaign

URL: http://hdl.handle.net/2142/18493

► Common quality requirements for crystallization products is so critical in the pharmaceutical industry, including the demands of the drug administration and customers (e.g. bioavailability, size… (more)

Subjects/Keywords: Antisolvent crystallization; cooling crystallization; dual impinging jet; Y-mixer; paracetamol; Feedback Control

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APA (6^th Edition):

Zhou, L. (2011). Optimal Control of Antisolvent and Cooling Crystallization. (Thesis). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/18493

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):

Zhou, Lifang. “Optimal Control of Antisolvent and Cooling Crystallization.” 2011. Thesis, University of Illinois – Urbana-Champaign. Accessed December 15, 2019. http://hdl.handle.net/2142/18493.

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

MLA Handbook (7^th Edition):

Zhou, Lifang. “Optimal Control of Antisolvent and Cooling Crystallization.” 2011. Web. 15 Dec 2019.

Vancouver:

Zhou L. Optimal Control of Antisolvent and Cooling Crystallization. [Internet] [Thesis]. University of Illinois – Urbana-Champaign; 2011. [cited 2019 Dec 15]. Available from: http://hdl.handle.net/2142/18493.

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

Council of Science Editors:

Zhou L. Optimal Control of Antisolvent and Cooling Crystallization. [Thesis]. University of Illinois – Urbana-Champaign; 2011. Available from: http://hdl.handle.net/2142/18493

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

Indian Institute of Science

21. Gadgil, Hrishikesh Prabhakar. Studies On Impinging-Jet Atomizers.

Degree: 2007, Indian Institute of Science

URL: http://hdl.handle.net/2005/485

► Characteristics of impinging-jet atomizers in the context of application in liquid propulsion systems are studied in this thesis. A review of past studies on impinging… (more)

Subjects/Keywords: Jet Engines; Liquid Propulsion; Combustion; Liquid Propellant Rockets - Atomization; Skewed Jets; Impinging Jets; Jet Atomizers; Sauter Mean Diameter (SMD); Heat Engineering

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APA (6^th Edition):

Gadgil, H. P. (2007). Studies On Impinging-Jet Atomizers. (Thesis). Indian Institute of Science. Retrieved from http://hdl.handle.net/2005/485

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):

Gadgil, Hrishikesh Prabhakar. “Studies On Impinging-Jet Atomizers.” 2007. Thesis, Indian Institute of Science. Accessed December 15, 2019. http://hdl.handle.net/2005/485.

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

MLA Handbook (7^th Edition):

Gadgil, Hrishikesh Prabhakar. “Studies On Impinging-Jet Atomizers.” 2007. Web. 15 Dec 2019.

Vancouver:

Gadgil HP. Studies On Impinging-Jet Atomizers. [Internet] [Thesis]. Indian Institute of Science; 2007. [cited 2019 Dec 15]. Available from: http://hdl.handle.net/2005/485.

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

Council of Science Editors:

Gadgil HP. Studies On Impinging-Jet Atomizers. [Thesis]. Indian Institute of Science; 2007. Available from: http://hdl.handle.net/2005/485

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

Cranfield University

22. Myszko, M. Experimental and computational studies of factors affecting impinging jet flowfields.

Degree: PhD, Department of Aerospace and Guidance Systems, 2009, Cranfield University

URL: http://hdl.handle.net/1826/3888

► An experimental and computational study was made of a single circular jet impinging onto a flat ground board. A 1/2" nozzle running at a fixed… (more)

▼ An experimental and computational study was made of a single circular jet impinging onto a flat ground board. A 1/2" nozzle running at a fixed nozzle pressure ratio of 1.05 was used in the experimental phase (giving an nozzle exit Reynolds number of 90xlO'), the nozzle to ground plane separation being varied between 2 and 10 nozzle diameters. Measurements were performed in the free and wall jets using single and cross-wire hot-wire anemometry techniques and pitot pressure probes in order to detemine mean velocity and normal and shear stress distributions. Some analysis is also presentedo f earlier measurementso n high pressurer atio impinging jets. Nozzle height was found to effect the initial thickness of the wall jet leaving the impingement region, increasing nozzle to ground plane separation increasing the wall jet thickness, although this separation distance did not seem to affect the rate at which the wall jet grew. Nozzle height was also found to have a large effect on the peak level of turbulence found in the wall jet up to a radial distan ce from the jet axial centre line of 4.5 nozzle diameters, after which the profiles become self-similar. Lowering the nozzle tended to increase the peak level measured in all the turbulent stresses within this development region. The production of turbulent kinetic energy in the wall jet, which is an indication of the amount of work done against the mean flow by the turbulent flow was found to increase dramatically with decreasing nozzle height. This was attributed to greater shearing of the flow at lower nozzle heights due to a thinner wall jet leaving the impingement region. A moving impingement surface was found to cause separation of the wall jet inner boundary layer on the 'approach' side leading to very rapid decay of peak velocity. The point of separation was found to occur at radial positions in the region of 7.0 to 8.0 nozzle diameters, this reducing slightly for lower nozzle heights. A parametric investigation was performed using the k-e turbulence model and the PHOENICS CFD code. It was found that due to inadequacies in the model, it failed to predict accurately the growth of the wall jet, both in terms of its initial thickness and the rate of growth. It did, however, predict an increase in wall jet thickness with both increasing nozzle height and exit turbulence intensity and decreasing nozzle pressure ratio. Modifications were made to the constants in the model to try and improve the predictions,w ith a limited degreeo f successT. he low Reynoldsn umber k-F-t urbulence model was shown to give a slightly improved non-dimensional wall jet profile, although this did not improve the predicted rate of growth of the wall jet.

Subjects/Keywords: Aeronautics; Air travel; Single circular jet; Impinging jet flowfields; Experimental and computational studies; Modellign and simulation

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APA (6^th Edition):

Myszko, M. (2009). Experimental and computational studies of factors affecting impinging jet flowfields. (Doctoral Dissertation). Cranfield University. Retrieved from http://hdl.handle.net/1826/3888

Chicago Manual of Style (16^th Edition):

Myszko, M. “Experimental and computational studies of factors affecting impinging jet flowfields.” 2009. Doctoral Dissertation, Cranfield University. Accessed December 15, 2019. http://hdl.handle.net/1826/3888.

MLA Handbook (7^th Edition):

Myszko, M. “Experimental and computational studies of factors affecting impinging jet flowfields.” 2009. Web. 15 Dec 2019.

Vancouver:

Myszko M. Experimental and computational studies of factors affecting impinging jet flowfields. [Internet] [Doctoral dissertation]. Cranfield University; 2009. [cited 2019 Dec 15]. Available from: http://hdl.handle.net/1826/3888.

Council of Science Editors:

Myszko M. Experimental and computational studies of factors affecting impinging jet flowfields. [Doctoral Dissertation]. Cranfield University; 2009. Available from: http://hdl.handle.net/1826/3888

Youngstown State University

23. Friedrich, Brian Karl, II. An Experimental Study of Volumetric Quality on Fluid Flow and Heat Transfer Characteristics for Two Phase Impinging Jets.

Degree: MSin Engineering, Department of Mechanical and Industrial Engineering, 2016, Youngstown State University

URL: http://rave.ohiolink.edu/etdc/view?acc_num=ysu1463935537

► This study further expands the current knowledge of the relationship between heat transfer and fluid mechanics. Fluid flow and heat transfer characteristics of air-assisted water… (more)

Subjects/Keywords: Fluid Dynamics; Mechanical Engineering; Experiments; impinging jet; Hydraulic Jump; two phase; two-phase; fluid flow; Heat transfer; jet impingement; Volumetric quality

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APA (6^th Edition):

Friedrich, Brian Karl, I. (2016). An Experimental Study of Volumetric Quality on Fluid Flow and Heat Transfer Characteristics for Two Phase Impinging Jets. (Masters Thesis). Youngstown State University. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=ysu1463935537

Chicago Manual of Style (16^th Edition):

Friedrich, Brian Karl, II. “An Experimental Study of Volumetric Quality on Fluid Flow and Heat Transfer Characteristics for Two Phase Impinging Jets.” 2016. Masters Thesis, Youngstown State University. Accessed December 15, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=ysu1463935537.

MLA Handbook (7^th Edition):

Friedrich, Brian Karl, II. “An Experimental Study of Volumetric Quality on Fluid Flow and Heat Transfer Characteristics for Two Phase Impinging Jets.” 2016. Web. 15 Dec 2019.

Vancouver:

Friedrich, Brian Karl I. An Experimental Study of Volumetric Quality on Fluid Flow and Heat Transfer Characteristics for Two Phase Impinging Jets. [Internet] [Masters thesis]. Youngstown State University; 2016. [cited 2019 Dec 15]. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ysu1463935537.

Council of Science Editors:

Friedrich, Brian Karl I. An Experimental Study of Volumetric Quality on Fluid Flow and Heat Transfer Characteristics for Two Phase Impinging Jets. [Masters Thesis]. Youngstown State University; 2016. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ysu1463935537

24. Brunier-Coulin, Florian. Etude des mécanismes élémentaires de l'érosion d'un sol cohésif : Study of the elementary mechanisms of erosion mechanisms of cohesive granular materials.

Degree: Docteur es, Mécanique et Physique des Fluides, 2016, Aix Marseille Université

URL: http://www.theses.fr/2016AIXM4740

►

Les mécanismes élémentaires mis en jeu lors de l’érosion de surface d’un sol cohésif par un écoulement fluide demandent à être mieux connus dans le… (more)

▼

Les mécanismes élémentaires mis en jeu lors de l’érosion de surface d’un sol cohésif par un écoulement fluide demandent à être mieux connus dans le but d’améliorer la modélisation locale de l’érosion. En se basant sur une approche expérimentale, l’objectif de cette thèse vise à réaliser une étude paramétrique de l'érosion à l'aide de matériaux modèles, pour ensuite les soumettre à des sollicitations hydrodynamiques et mécaniques contrôlées. L'étude de matériaux granulaire sans cohésion a d'abord permis d'analyser la construction du nombre de Shields pour définir le seuil d'érosion. Ensuite, des essais de traction à différentes échelles ont permis de généraliser le nombre de Shields à des grains cohésifs par la relation entre seuil d'érosion et résistance mécanique. La mise au point de matériaux et d'essais d'érosion iso-indice a également permis de visualiser les mécanismes par lesquels l'écoulement conduit à l’arrachement de particules constitutives du matériau modèle lors d'essais de JET et de HET. Pour finir, d'autres types de matériaux cohésifs modèles ont été plus rapidement étudiés et révèlent de grandes perspectives d'études.

Elementary mechanisms involved during the surface erosion of a cohesive soil by a fluid flow ask to be better understood for improving the local modeling of erosion. It is the objective of this thesis which aims, by an experimental approach, at working out model materials to submit them to hydrodynamic stresses and controlled mechanic stresses. The study of cohesion-less granular material allowed, in a first approach, to analyse the Shields number formulation to define the erosion threshold. In a second time, the grains have been made cohesive with liquid or solid matrix, and mechanical tests at different scales allowed to generalise the Shields number to both cohesive and non-cohesive particles. The development of erosion tests adjusted in optical index also made possible to visualised the mechanisms by which the fluid flow erode the constitutive particles of the material during Jet Erosion Tests and Hole Erosion Tests. Finally, different kinds of cohesive model materials were tested and show excellent perspectives.

Advisors/Committee Members: Philippe, Pierre (thesis director).

Subjects/Keywords: Érosion; Matériaux cohésifs; Jet impactant; Milieux granulaires; Essais géomécaniques; Erosion; Cohesive materials; Impinging jet; Granular materials; Geomechanical tests

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APA (6^th Edition):

Brunier-Coulin, F. (2016). Etude des mécanismes élémentaires de l'érosion d'un sol cohésif : Study of the elementary mechanisms of erosion mechanisms of cohesive granular materials. (Doctoral Dissertation). Aix Marseille Université. Retrieved from http://www.theses.fr/2016AIXM4740

Chicago Manual of Style (16^th Edition):

Brunier-Coulin, Florian. “Etude des mécanismes élémentaires de l'érosion d'un sol cohésif : Study of the elementary mechanisms of erosion mechanisms of cohesive granular materials.” 2016. Doctoral Dissertation, Aix Marseille Université. Accessed December 15, 2019. http://www.theses.fr/2016AIXM4740.

MLA Handbook (7^th Edition):

Brunier-Coulin, Florian. “Etude des mécanismes élémentaires de l'érosion d'un sol cohésif : Study of the elementary mechanisms of erosion mechanisms of cohesive granular materials.” 2016. Web. 15 Dec 2019.

Vancouver:

Brunier-Coulin F. Etude des mécanismes élémentaires de l'érosion d'un sol cohésif : Study of the elementary mechanisms of erosion mechanisms of cohesive granular materials. [Internet] [Doctoral dissertation]. Aix Marseille Université 2016. [cited 2019 Dec 15]. Available from: http://www.theses.fr/2016AIXM4740.

Council of Science Editors:

Brunier-Coulin F. Etude des mécanismes élémentaires de l'érosion d'un sol cohésif : Study of the elementary mechanisms of erosion mechanisms of cohesive granular materials. [Doctoral Dissertation]. Aix Marseille Université 2016. Available from: http://www.theses.fr/2016AIXM4740

Cranfield University

25. Myszko, M. Experimental and computational studies of factors affecting impinging jet flowfields.

Degree: PhD, 2009, Cranfield University

URL: http://dspace.lib.cranfield.ac.uk/handle/1826/3888 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.339707

► An experimental and computational study was made of a single circular jet impinging onto a flat ground board. A 1/2' nozzle running at a fixed… (more)

▼ An experimental and computational study was made of a single circular jet impinging onto a flat ground board. A 1/2' nozzle running at a fixed nozzle pressure ratio of 1.05 was used in the experimental phase (giving an nozzle exit Reynolds number of 90xlO'), the nozzle to ground plane separation being varied between 2 and 10 nozzle diameters. Measurements were performed in the free and wall jets using single and cross-wire hot-wire anemometry techniques and pitot pressure probes in order to detemine mean velocity and normal and shear stress distributions. Some analysis is also presentedo f earlier measurementso n high pressurer atio impinging jets. Nozzle height was found to effect the initial thickness of the wall jet leaving the impingement region, increasing nozzle to ground plane separation increasing the wall jet thickness, although this separation distance did not seem to affect the rate at which the wall jet grew. Nozzle height was also found to have a large effect on the peak level of turbulence found in the wall jet up to a radial distan ce from the jet axial centre line of 4.5 nozzle diameters, after which the profiles become self-similar. Lowering the nozzle tended to increase the peak level measured in all the turbulent stresses within this development region. The production of turbulent kinetic energy in the wall jet, which is an indication of the amount of work done against the mean flow by the turbulent flow was found to increase dramatically with decreasing nozzle height. This was attributed to greater shearing of the flow at lower nozzle heights due to a thinner wall jet leaving the impingement region. A moving impingement surface was found to cause separation of the wall jet inner boundary layer on the 'approach' side leading to very rapid decay of peak velocity. The point of separation was found to occur at radial positions in the region of 7.0 to 8.0 nozzle diameters, this reducing slightly for lower nozzle heights. A parametric investigation was performed using the k-e turbulence model and the PHOENICS CFD code. It was found that due to inadequacies in the model, it failed to predict accurately the growth of the wall jet, both in terms of its initial thickness and the rate of growth. It did, however, predict an increase in wall jet thickness with both increasing nozzle height and exit turbulence intensity and decreasing nozzle pressure ratio. Modifications were made to the constants in the model to try and improve the predictions,w ith a limited degreeo f successT. he low Reynoldsn umber k-F-t urbulence model was shown to give a slightly improved non-dimensional wall jet profile, although this did not improve the predicted rate of growth of the wall jet.

Subjects/Keywords: 629.1323; Aeronautics; Air travel; Single circular jet; Impinging jet flowfields; Experimental and computational studies; Modellign and simulation

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APA (6^th Edition):

Myszko, M. (2009). Experimental and computational studies of factors affecting impinging jet flowfields. (Doctoral Dissertation). Cranfield University. Retrieved from http://dspace.lib.cranfield.ac.uk/handle/1826/3888 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.339707

Chicago Manual of Style (16^th Edition):

Myszko, M. “Experimental and computational studies of factors affecting impinging jet flowfields.” 2009. Doctoral Dissertation, Cranfield University. Accessed December 15, 2019. http://dspace.lib.cranfield.ac.uk/handle/1826/3888 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.339707.

MLA Handbook (7^th Edition):

Myszko, M. “Experimental and computational studies of factors affecting impinging jet flowfields.” 2009. Web. 15 Dec 2019.

Vancouver:

Myszko M. Experimental and computational studies of factors affecting impinging jet flowfields. [Internet] [Doctoral dissertation]. Cranfield University; 2009. [cited 2019 Dec 15]. Available from: http://dspace.lib.cranfield.ac.uk/handle/1826/3888 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.339707.

Council of Science Editors:

Myszko M. Experimental and computational studies of factors affecting impinging jet flowfields. [Doctoral Dissertation]. Cranfield University; 2009. Available from: http://dspace.lib.cranfield.ac.uk/handle/1826/3888 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.339707

University of Waterloo

26. Pieris, Supun. Experimental Investigation of a Normally Impinging Planar Jet.

Degree: 2017, University of Waterloo

URL: http://hdl.handle.net/10012/12686

► Impinging jets are commonly employed in engineering applications, such as cooling and drying processes, requiring relatively high local transport properties. Flow development of a planar… (more)

▼ Impinging jets are commonly employed in engineering applications, such as cooling and drying processes, requiring relatively high local transport properties. Flow development of a planar impinging jet and the effect of varying jet parameters are investigated experimentally in a jet facility that is specifically designed, fabricated, and characterized as part of the current study. The velocity field is measured using time-resolved, planar, two-component Particle Image Velocimetry. The investigation focuses on two jet parameters: Reynolds number and nozzle-to-plate spacing. Four test cases are investigated, including two Reynolds numbers 3000 and 6000, and two nozzle-to-plate spacings, 2B and 4B, where B is the jet width. Primary vortices form in the shear layer just downstream of the nozzle exit due to amplification of disturbances through the Kelvin-Helmholtz instability. Vortex shedding exhibits higher periodicity with increasing Reynolds number but is not significantly affected by changes to the nozzle-to-plate spacing. Further, vortex shedding location shifts upstream with increasing Reynolds number. The Strouhal number based on vortex shedding frequency varies between 0.4-0.5 and the vortices are convected downstream at an average convective velocity of 57% of the jet centerline velocity for all cases examined. For Reynolds number of 6000, the characteristic wavelength of the primary vortices is 1.1B for both nozzle-to-plate spacings. At the lower Reynolds number, the wavelengths increase to approximately 1.3B and 1.5B, for nozzle-to-plate spacings of 2B and 4B, respectively. Local deceleration of primary vortices, due to the impinging surface, causes consecutively shed vortices to merge, with vortex merging observed in all cases investigated. As the primary vortices pass in the outer shear layer of the wall jet region, secondary vortices of opposingly signed vorticity form due to roll-up of the wall bound vorticity in the inner shear layer. The secondary vortex shedding is marked by amplification of the surface normal velocity fluctuations in the inner shear layer when x/B > 3. The secondary vortex shedding shows a lower periodicity compared to the primary vortices but in general have convective velocities that are larger than that of the primary vortices. As the Reynolds number is increased, the secondary vortex formation is suppressed, and, as a result, the wall jet develops more parallel to the impinging surface. With increasing Reynolds number, the convective velocities of the secondary vortices also decrease. In all cases, pairing between a primary and secondary vortex is observed and the paired vortices are convected in the streamwise direction away from the surface. At the higher Reynolds number, the pairing is immediately followed by vortex breakdown.

Subjects/Keywords: Fluid mehcanics; Coherent structures; Fluid dynamics; Impinging jet; Vortex dynamics; Experimental methods; Particle Image Velocimetry; Thermo-fluids; Air jet

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APA (6^th Edition):

Pieris, S. (2017). Experimental Investigation of a Normally Impinging Planar Jet. (Thesis). University of Waterloo. Retrieved from http://hdl.handle.net/10012/12686

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):

Pieris, Supun. “Experimental Investigation of a Normally Impinging Planar Jet.” 2017. Thesis, University of Waterloo. Accessed December 15, 2019. http://hdl.handle.net/10012/12686.

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

MLA Handbook (7^th Edition):

Pieris, Supun. “Experimental Investigation of a Normally Impinging Planar Jet.” 2017. Web. 15 Dec 2019.

Vancouver:

Pieris S. Experimental Investigation of a Normally Impinging Planar Jet. [Internet] [Thesis]. University of Waterloo; 2017. [cited 2019 Dec 15]. Available from: http://hdl.handle.net/10012/12686.

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

Council of Science Editors:

Pieris S. Experimental Investigation of a Normally Impinging Planar Jet. [Thesis]. University of Waterloo; 2017. Available from: http://hdl.handle.net/10012/12686

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

University of Waterloo

27. Stan, Gheorghe. Fundamental Characteristics of Turbulent Opposed Impinging Jets.

Degree: 2000, University of Waterloo

URL: http://hdl.handle.net/10012/831

► A fundamental study of two turbulent directly opposed impinging jets in a stagnant ambient fluid, unconfined or uninfluenced by walls is presented. By experimental investigation… (more)

Subjects/Keywords: Mechanical Engineering; opposed impinging jets; turbulent jet; jet

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APA (6^th Edition):

Stan, G. (2000). Fundamental Characteristics of Turbulent Opposed Impinging Jets. (Thesis). University of Waterloo. Retrieved from http://hdl.handle.net/10012/831

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):

Stan, Gheorghe. “Fundamental Characteristics of Turbulent Opposed Impinging Jets.” 2000. Thesis, University of Waterloo. Accessed December 15, 2019. http://hdl.handle.net/10012/831.

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

MLA Handbook (7^th Edition):

Stan, Gheorghe. “Fundamental Characteristics of Turbulent Opposed Impinging Jets.” 2000. Web. 15 Dec 2019.

Vancouver:

Stan G. Fundamental Characteristics of Turbulent Opposed Impinging Jets. [Internet] [Thesis]. University of Waterloo; 2000. [cited 2019 Dec 15]. Available from: http://hdl.handle.net/10012/831.

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

Council of Science Editors:

Stan G. Fundamental Characteristics of Turbulent Opposed Impinging Jets. [Thesis]. University of Waterloo; 2000. Available from: http://hdl.handle.net/10012/831

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

28. Assoum, Hassan. Étude expérimentale des couplages entre la dynamique d’un jet qui heurte une plaque fendue et l’émission sonore générée : Experimental study of coupling between the dynamics of a jet impinging a slotted plate and the noise generated.

Degree: Docteur es, Génie civil, 2013, La Rochelle

URL: http://www.theses.fr/2013LAROS420

►

Un jet heurtant une plaque fendue peut générer, dans certaines configurations, des nuisances sonores. En effet, l’interaction de l’écoulement et de l’obstacle au niveau de… (more)

▼

Un jet heurtant une plaque fendue peut générer, dans certaines configurations, des nuisances sonores. En effet, l’interaction de l’écoulement et de l’obstacle au niveau de la fente, sous certaines conditions, donne naissance à une perturbation remontant l’écoulement et pouvant contrôler son détachement à sa naissance. La perturbation produite par cette boucle de rétroaction optimise le transfert d’énergie du champ aérodynamique du jet vers le champ acoustique rayonné. Afin d’appréhender la dynamique tourbillonnaire, d’analyser les couplages entre cette dernière et les émissions sonores générées et de mieux comprendre les phénomènes responsables de ces nuisances, un dispositif expérimental basé sur de la métrologie laser a été réalisé. Ce système permet, d’une part, la génération de l’écoulement et la maitrise de ses paramètres (confinement, vitesse, forme,…) et d’autre part, la réalisation de plans lasers et de mesures par imagerie de particules (PIV). Ainsi le travail présenté dans ce manuscrit concerne les couplages qui existent entre la dynamique de l’écoulement heurtant une plaque fendue et les champs acoustiques générés. Les mesures de champs cinématiques d’un jet plan heurtant une plaque fendue par Vélocimétrie par Images de Particules (PIV) sont réalisées simultanément avec des mesures de champs acoustiques. Après avoir caractérisé les écoulements étudiés, on présente par des graphes spatio-temporels, les corrélations entre les signaux acoustiques et les vitesses de l’écoulement depuis la sortie du jet jusqu’à son arrivée à la plaque fendue. Ces corrélations sont calculées de deux manières : à partir de signaux bruts dans un premier temps, puis, dans un second temps, avec une méthode de pré-blanchiment (terme anglo-saxon : ‘’pre-whitening’’). Cette méthode vise à mettre en exergue l’existence d’une instabilité globale du jet qui existe dans les signaux analysés. Cette instabilité est importante pour la boucle de rétroaction des sons auto-entretenus, mais quasiment masquée devant les phénomènes principaux dominants (tourbillons primaires) dans le calcul des inter-corrélations.

Self-sustaining sounds related to aero-acoustic coupling occurs in impinging jets when a feedback loop is present between the jet exit and a slotted plate: the downstream-convected coherent structures and upstream-propagating pressure waves generated by the impingement of the coherent structures on the plate are phase locked at the nozzle exit. The upstream-propagating waves excite the thin shear layer near the nozzle lip and result in periodic coherent structures. The period is determined by the convection speed of the coherent structures and the distance between the nozzle and the plate. Simultaneous measurements of the velocity fields and the acoustic waves in a plane jet impinging a slotted plate were performed using time-resolved particle image velocimetry (PIV) and a microphone. A better understanding of the flow physics and the aero-acoustic coupling are obtained thanks to spatio-temporal cross-correlations between the…

Advisors/Committee Members: Sakout, Anas (thesis director).

Subjects/Keywords: Sons auto-entretenus; Jet plan; Jet heurtant; Aéro-acoustique; Dynamique tourbillonnaire; Mesures PIV; Champ acoustique; Self-sustaining sounds; Plane jet; Impinging jets; Aero-acoustics; Vortex dynamics; PIV measurements; Acoustic field

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

APA (6^th Edition):

Assoum, H. (2013). Étude expérimentale des couplages entre la dynamique d’un jet qui heurte une plaque fendue et l’émission sonore générée : Experimental study of coupling between the dynamics of a jet impinging a slotted plate and the noise generated. (Doctoral Dissertation). La Rochelle. Retrieved from http://www.theses.fr/2013LAROS420

Chicago Manual of Style (16^th Edition):

Assoum, Hassan. “Étude expérimentale des couplages entre la dynamique d’un jet qui heurte une plaque fendue et l’émission sonore générée : Experimental study of coupling between the dynamics of a jet impinging a slotted plate and the noise generated.” 2013. Doctoral Dissertation, La Rochelle. Accessed December 15, 2019. http://www.theses.fr/2013LAROS420.

MLA Handbook (7^th Edition):

Assoum, Hassan. “Étude expérimentale des couplages entre la dynamique d’un jet qui heurte une plaque fendue et l’émission sonore générée : Experimental study of coupling between the dynamics of a jet impinging a slotted plate and the noise generated.” 2013. Web. 15 Dec 2019.

Vancouver:

Assoum H. Étude expérimentale des couplages entre la dynamique d’un jet qui heurte une plaque fendue et l’émission sonore générée : Experimental study of coupling between the dynamics of a jet impinging a slotted plate and the noise generated. [Internet] [Doctoral dissertation]. La Rochelle; 2013. [cited 2019 Dec 15]. Available from: http://www.theses.fr/2013LAROS420.

Council of Science Editors:

Assoum H. Étude expérimentale des couplages entre la dynamique d’un jet qui heurte une plaque fendue et l’émission sonore générée : Experimental study of coupling between the dynamics of a jet impinging a slotted plate and the noise generated. [Doctoral Dissertation]. La Rochelle; 2013. Available from: http://www.theses.fr/2013LAROS420

University of Cincinnati

29. Landers, Brian D. Mixing Characteristics of Turbulent Twin Impinging Axisymmetric Jets at Various Impingement Angles.

Degree: MS, Engineering and Applied Science: Aerospace Engineering, 2016, University of Cincinnati

URL: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1467987856

► An experimental study is first presented on the comparison between two commonly used velocity measurement techniques applied in experimental fluid dynamics: Constant Temperature Anemometry (CTA)… (more)

▼ An experimental study is first presented on the comparison between two commonly used velocity measurement techniques applied in experimental fluid dynamics: Constant Temperature Anemometry (CTA) and Particle Image Velocimetry (PIV). The comparison is performed in the near-field region of an axisymmetric circular turbulent jet where the flow field contains large scale turbulent structures. The comparison was performed for five Reynolds numbers, based on diameter, between 5,000 and 25,000. The Reynolds numbers selected cover the critical Reynolds number range, 10,000 to 20,000 where the characteristics of the flow transition to a fully developed turbulent mixing layer. A comparison between these two measurement techniques was performed in order to determine the differences between an intrusive (CTA) and non-intrusive (PIV) method when applied to a practical application. The results and observations obtained from the comparison between the two techniques were applied to better characterize the time-averaged characteristics of a single axisymmetric turbulent jet with a Reynolds number of 7,500. The mean and fluctuating velocities, turbulent kinetic energy (TKE), and vorticity were measured as a baseline case. Additionally, smoke visualization was utilized to determine the mixing characteristics of the transient start of an axisymmetric turbulent jet. The shedding frequencies, also known as, the `preferred mode’ were investigated for a single jet. Particle Image Velocimetry (PIV) was also utilized to characterize the pre-and post-regions of the interaction region of two axisymmetric, incompressible turbulent jets at included angles: 30, 45, and 60 degrees. The Reynolds number selected (7,500) was within the range of critical Reynolds numbers and the geometrical distance to twin jet impingement, X0, remained constant at 10.33D for each impingement angle. The mean and fluctuating velocities, vorticity, and turbulent kinetic energy (TKE) were measured. Smoke Visualization was utilized to measure the mixing characteristics of impinging jets during the transient start as well as when the jets had reached a steady state condition. Advisors/Committee Members: Disimile, Peter (Committee Chair).

Subjects/Keywords: Aerospace Materials; Impinging Jets; Axisymmetric Turbulent Jet; Particle Image Velocimetry; Constant Temperature Anemometry; Hotwire Anemometry; Turbulent Flow

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

APA (6^th Edition):

Landers, B. D. (2016). Mixing Characteristics of Turbulent Twin Impinging Axisymmetric Jets at Various Impingement Angles. (Masters Thesis). University of Cincinnati. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=ucin1467987856

Chicago Manual of Style (16^th Edition):

Landers, Brian D. “Mixing Characteristics of Turbulent Twin Impinging Axisymmetric Jets at Various Impingement Angles.” 2016. Masters Thesis, University of Cincinnati. Accessed December 15, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1467987856.

MLA Handbook (7^th Edition):

Landers, Brian D. “Mixing Characteristics of Turbulent Twin Impinging Axisymmetric Jets at Various Impingement Angles.” 2016. Web. 15 Dec 2019.

Vancouver:

Landers BD. Mixing Characteristics of Turbulent Twin Impinging Axisymmetric Jets at Various Impingement Angles. [Internet] [Masters thesis]. University of Cincinnati; 2016. [cited 2019 Dec 15]. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1467987856.

Council of Science Editors:

Landers BD. Mixing Characteristics of Turbulent Twin Impinging Axisymmetric Jets at Various Impingement Angles. [Masters Thesis]. University of Cincinnati; 2016. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1467987856

Delft University of Technology

30. Hadziabdic, M. LES, RANS and combined simulation of impinging flows and heat transfer.

Degree: 2006, Delft University of Technology

URL: http://resolver.tudelft.nl/uuid:47cb00a2-d935-4a0a-b68b-a0440cfb9d26 ; urn:NBN:nl:ui:24-uuid:47cb00a2-d935-4a0a-b68b-a0440cfb9d26 ; urn:NBN:nl:ui:24-uuid:47cb00a2-d935-4a0a-b68b-a0440cfb9d26 ; http://resolver.tudelft.nl/uuid:47cb00a2-d935-4a0a-b68b-a0440cfb9d26

► This thesis reports on a numerical study of a round, isothermal turbulent jet of incompressible fluid, impinging normally on a flat wall at a different… (more)

▼ This thesis reports on a numerical study of a round, isothermal turbulent jet of incompressible fluid, impinging normally on a flat wall at a different temperature. The aim was to generate detailed information about the ime-dependent three-dimensional velocity and temperature field, and, based on this, to extract statistically averaged flow and turbulence properties, as well as to identify and analyze the dominant vortical structures, their evolution and thermal signature on the target wall. The main body of the thesis deals with LES studies using the dynamic subgrid-scale model, of flow and heat transfer in a round impinging jet at Re=20000 and orifice-to-plate distance h/D=2. The LES were performed using the in-house unstructured finite-volume computational code T-FlowS. Prior to the jet simulations, the computational code and its features (the numerical schemes and solver, boundary conditions, mesh generation and refinement, implementation of the dynamic sub-grid scale model into an unstructured code) as well as structure identification and interpretation, were tested in the simulation of a plane channel and a pipe flow, the latter with heat transfer. Because a round impinging jet contains several flow regions, each featured by different flow physics (free jet expansion, impingement, jet deflection with strong acceleration, radially spreading and decelerating wall jet), several mesh refinements (with up to 10 million mesh cells), and different conditions at the free inflow boundary of the computational domain were explored until satisfactory agreement with the available experimental results was achieved. The final results, believed to be credibly accurate, were processed to extract the mean flow and turbulence statistics, budgets of the transport equations for the Reynolds stresses and turbulent-heat-flux components, as well as to analyze the time dynamics of the vortical structure and its relation with the instantaneous and averaged wall heat transfer. The LES confirmed some of the experimentally detected features such as a dip and a second maximum in the Nusselt number and negative production of turbulence kinetic energy in the stagnation region, but also revealed some other interesting phenomena such as strong oscillation of the stagnation point and the unsteady flow separation at the onset of wall-jet formation. These events were identified as the main cause of the Nu-number nonuniformity, and were linked to the ring vortices generated in the jet shear layer, and their asymmetric break-up prior or after the impingement. The second focus of the thesis was the study of the feasibility of combining the LES and RANS approaches into a hybrid method. The goal was to provide the time resolved three-dimensional solutions of the velocity and temperature field (though associated with the larger turbulence scales only) while using the mesh size typical of that used in off-wall LES or in the RANS computation. Two directions were pursued in parallel: zonal approaches with predefined RANS and LES zones, and seamless methods… Advisors/Committee Members: Hanjalic, K..

Subjects/Keywords: LES; RANS; hybrid LES/RANS; impinging jet

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

APA (6^th Edition):

Hadziabdic, M. (2006). LES, RANS and combined simulation of impinging flows and heat transfer. (Doctoral Dissertation). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:47cb00a2-d935-4a0a-b68b-a0440cfb9d26 ; urn:NBN:nl:ui:24-uuid:47cb00a2-d935-4a0a-b68b-a0440cfb9d26 ; urn:NBN:nl:ui:24-uuid:47cb00a2-d935-4a0a-b68b-a0440cfb9d26 ; http://resolver.tudelft.nl/uuid:47cb00a2-d935-4a0a-b68b-a0440cfb9d26

Chicago Manual of Style (16^th Edition):

Hadziabdic, M. “LES, RANS and combined simulation of impinging flows and heat transfer.” 2006. Doctoral Dissertation, Delft University of Technology. Accessed December 15, 2019. http://resolver.tudelft.nl/uuid:47cb00a2-d935-4a0a-b68b-a0440cfb9d26 ; urn:NBN:nl:ui:24-uuid:47cb00a2-d935-4a0a-b68b-a0440cfb9d26 ; urn:NBN:nl:ui:24-uuid:47cb00a2-d935-4a0a-b68b-a0440cfb9d26 ; http://resolver.tudelft.nl/uuid:47cb00a2-d935-4a0a-b68b-a0440cfb9d26.

MLA Handbook (7^th Edition):

Hadziabdic, M. “LES, RANS and combined simulation of impinging flows and heat transfer.” 2006. Web. 15 Dec 2019.

Vancouver:

Hadziabdic M. LES, RANS and combined simulation of impinging flows and heat transfer. [Internet] [Doctoral dissertation]. Delft University of Technology; 2006. [cited 2019 Dec 15]. Available from: http://resolver.tudelft.nl/uuid:47cb00a2-d935-4a0a-b68b-a0440cfb9d26 ; urn:NBN:nl:ui:24-uuid:47cb00a2-d935-4a0a-b68b-a0440cfb9d26 ; urn:NBN:nl:ui:24-uuid:47cb00a2-d935-4a0a-b68b-a0440cfb9d26 ; http://resolver.tudelft.nl/uuid:47cb00a2-d935-4a0a-b68b-a0440cfb9d26.

Council of Science Editors:

Hadziabdic M. LES, RANS and combined simulation of impinging flows and heat transfer. [Doctoral Dissertation]. Delft University of Technology; 2006. Available from: http://resolver.tudelft.nl/uuid:47cb00a2-d935-4a0a-b68b-a0440cfb9d26 ; urn:NBN:nl:ui:24-uuid:47cb00a2-d935-4a0a-b68b-a0440cfb9d26 ; urn:NBN:nl:ui:24-uuid:47cb00a2-d935-4a0a-b68b-a0440cfb9d26 ; http://resolver.tudelft.nl/uuid:47cb00a2-d935-4a0a-b68b-a0440cfb9d26

Open Access Theses and Dissertations