Studies Of Two Phase Flow Dynamics And Heat Transfer At Reduced Gravity Conditions
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Studies Of Two Phase Flow Dynamics And Heat Transfer At Reduced Gravity Conditions
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Author : National Aeronautics and Space Administration (NASA)
language : en
Publisher: Createspace Independent Publishing Platform
Release Date : 2018-07-11
Studies Of Two Phase Flow Dynamics And Heat Transfer At Reduced Gravity Conditions written by National Aeronautics and Space Administration (NASA) and has been published by Createspace Independent Publishing Platform this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-07-11 with categories.
The ability to predict gas-liquid flow patterns is crucial to the design and operation of two-phase flow systems in the microgravity environment. Flow pattern maps have been developed in this study which show the occurrence of flow patterns as a function of gas and liquid superficial velocities as well as tube diameter, liquid viscosity and surface tension. The results have demonstrated that the location of the bubble-slug transition is affected by the tube diameter for air-water systems and by surface tension, suggesting that turbulence-induced bubble fluctuations and coalescence mechanisms play a role in this transition. The location of the slug-annular transition on the flow pattern maps is largely unaffected by tube diameter, liquid viscosity or surface tension in the ranges tested. Void fraction-based transition criteria were developed which separate the flow patterns on the flow pattern maps with reasonable accuracy. Weber number transition criteria also show promise but further work is needed to improve these models. For annular gas-liquid flows of air-water and air- 50 percent glycerine under reduced gravity conditions, the pressure gradient agrees fairly well with a version of the Lockhart-Martinelli correlation but the measured film thickness deviates from published correlations at lower Reynolds numbers. Nusselt numbers, based on a film thickness obtained from standard normal-gravity correlations, follow the relation, Nu = A Re(sup n) Pr(exp l/3), but more experimental data in a reduced gravity environment are needed to increase the confidence in the estimated constants, A and n. In the slug flow regime, experimental pressure gradient does not correlate well with either the Lockhart-Martinelli or a homogeneous formulation, but does correlate nicely with a formulation based on a two-phase Reynolds number. Comparison with ground-based correlations implies that the heat transfer coefficients are lower at reduced gravity than at normal gravity under the same ...
Studies Of Two Phase Flow Dynamics And Heat Transfer At Reduced Gravity Conditions
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Author :
language : en
Publisher:
Release Date : 1996
Studies Of Two Phase Flow Dynamics And Heat Transfer At Reduced Gravity Conditions written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1996 with categories.
Microgravity Two Phase Flow And Heat Transfer
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Author : Kamiel S. Gabriel
language : en
Publisher: Springer Science & Business Media
Release Date : 2007-05-10
Microgravity Two Phase Flow And Heat Transfer written by Kamiel S. Gabriel and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007-05-10 with Technology & Engineering categories.
Multiphase thermal systems have numerous applications in aerospace, heat-exchange, transport of contaminants in environmental systems, and energy transport and conversion systems. A reduced - or microgravity - environment provides an excellent tool for accurate study of the flow without the masking effects of gravity. This book presents for the first time a comprehensive coverage of all aspects of two-phase flow behaviour in the virtual absence of gravity.
Fundamentals Of Low Gravity Fluid Dynamics And Heat Transfer
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Author : Basil N. Antar
language : en
Publisher: CRC Press
Release Date : 1993
Fundamentals Of Low Gravity Fluid Dynamics And Heat Transfer written by Basil N. Antar and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993 with Science categories.
This book presents the fundamentals of low gravity fluid dynamics and heat transfer. It investigates fluid behavior in low gravity environments such as those found in earth orbiting and space vehicles. The two major fluid phenomena affected by gravity (buoyancy and surface tension) are treated thoroughly from both the theoretical and applications points of view, and limitations of fluid and thermal responses to gravitational fields in space-based settings are clearly delineated. Summaries of all data available from low gravity flight and terrestrial experiments performed to date are also presented.
Physics Of Fluids In Microgravity
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Author : Rodolfo Monti
language : en
Publisher: CRC Press
Release Date : 2002-01-10
Physics Of Fluids In Microgravity written by Rodolfo Monti and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002-01-10 with Science categories.
In a microgravity experiment, the conditions prevalent in fluid phases can be substantially different from those on the ground and can be exploited to improve different processes. Fluid physics research in microgravity is important for the advancement of all microgravity scients: life, material, and engineering. Space flight provides a unique laboratory that allows scientists to improve their understanding of the behaviour of fluids in low gravity, allowing the investigation of phenomena and processes normally masked by the effects of gravity and thus difficult to study on Earth. Physics of Fluids in Microgravity provides a clear view of recent research and progress in the different fields of fluid research in space. The topics presented include bubles and drops dynamics, Maragoni flows, diffustion and thermodiffusion, solidfication,a nd crystal growth. The results obtained so far are, in some cases, to be confirmed by extensive research activities on the International Space station, where basic and applied microgravity experimentation will take place in the years to come.
Heat And Momentum Transfer Studies In High Reynolds Number Wavy Films At Normal And Reduced Gravity Conditions
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Author : National Aeronautics and Space Administration (NASA)
language : en
Publisher: Createspace Independent Publishing Platform
Release Date : 2018-07-05
Heat And Momentum Transfer Studies In High Reynolds Number Wavy Films At Normal And Reduced Gravity Conditions written by National Aeronautics and Space Administration (NASA) and has been published by Createspace Independent Publishing Platform this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-07-05 with categories.
We examined the effect of the gas flow on the liquid film when the gas flows in the countercurrent direction in a vertical pipe at normal gravity conditions. The most dramatic effect of the simultaneous flow of gas and liquid in pipes is the greatly increased transport rates of heat, mass, and momentum. In practical situations this enhancement can be a benefit or it can result in serious operational problems. For example, gas-liquid flow always results in substantially higher pressure drop and this is usually undesirable. However, much higher heat transfer coefficients can be expected and this can obviously be of benefit for purposes of design. Unfortunately, designers know so little of the behavior of such two phase systems and as a result these advantages are not utilized. Due to the complexity of the second order boundary model as well as the fact that the pressure variation across the film is small compared to the imposed gas phase pressure, the countercurrent gas flow affect was studied for the standard boundary layer model. A different stream function that can compensate the shear stress affect was developed and this stream function also can predict periodic solutions. The discretized model equations were transformed to a traveling wave coordinate system. A stability analysis of these sets of equations showed the presence of a Hopf bifurcation for certain values of the traveling wave velocity and the shear stress. The Hopf celerity was increased due to the countercurrent shear. For low flow rate the increases of celerity are more than for the high flow rate, which was also observed in experiments. Numerical integration of a traveling wave simplification of the model also predicts the existence of chaotic large amplitude, nonperiodic waves as observed in the experiments. The film thickness was increased by the shear. Balakotaiah, V. Johnson Space Center NAG9-854...
Two Phase Heat Transfer
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Author : Mirza Mohammed Shah
language : en
Publisher: John Wiley & Sons
Release Date : 2021-02-10
Two Phase Heat Transfer written by Mirza Mohammed Shah and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021-02-10 with Science categories.
A guide to two-phase heat transfer theory, practice, and applications Designed primarily as a practical resource for design and development engineers, Two-Phase Heat Transfer contains the theories and methods of two-phase heat transfer that are solution oriented. Written in a clear and concise manner, the book includes information on physical phenomena, experimental data, theoretical solutions, and empirical correlations. A very wide range of real-world applications and formulas/correlations for them are presented. The two-phase heat transfer systems covered in the book include boiling, condensation, gas-liquid mixtures, and gas-solid mixtures. The author—a noted expert in this field—also reviews the numerous applications of two-phase heat transfer such as heat exchangers in refrigeration and air conditioning, conventional and nuclear power generation, solar power plants, aeronautics, chemical processes, petroleum industry, and more. Special attention is given to heat exchangers using mini-channels which are being increasingly used in a variety of applications. This important book: Offers a practical guide to two-phase heat transfer Includes clear guidance for design professionals by identifying the best available predictive techniques Reviews the extensive literature on heat transfer in two-phase systems Presents information to aid in the design and analysis of heat exchangers. Written for students and research, design, and development engineers, Two-Phase Heat Transfer is a comprehensive volume that covers the theory, methods, and applications of two-phase heat transfer.
A Visual Study Of Two Phase Flow In A Vertical Tube With Heat Addition
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Author : Yih Yun Hsu
language : en
Publisher:
Release Date : 1963
A Visual Study Of Two Phase Flow In A Vertical Tube With Heat Addition written by Yih Yun Hsu and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1963 with Boiling-points categories.
Advances In Multiphase Flow And Heat Transfer
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Author : Lixin Cheng
language : en
Publisher: Bentham Science Publishers
Release Date : 2009-12-17
Advances In Multiphase Flow And Heat Transfer written by Lixin Cheng and has been published by Bentham Science Publishers this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009-12-17 with Science categories.
"Multiphase flow and heat transfer have found a wide range of applications in several engineering and science fields such as mechanical engineering, chemical and petrochemical engineering, nuclear engineering, energy engineering, material engineering, ocea"
Two Phase Flow Heat Transfer Under Microgravity Condition
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Author : M. Parang
language : en
Publisher:
Release Date : 2003
Two Phase Flow Heat Transfer Under Microgravity Condition written by M. Parang and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with categories.