Microgravity Two Phase Flow And Heat Transfer
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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.
Bubble Dynamics Two Phase Flow And Boiling Heat Transfer In Microgravity
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Author : National Aeronautics and Space Administration (NASA)
language : en
Publisher: Createspace Independent Publishing Platform
Release Date : 2018-07-23
Bubble Dynamics Two Phase Flow And Boiling Heat Transfer In Microgravity 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 2018-07-23 with categories.
This report contains two independent sections. Part one is titled Terrestrial and Microgravity Pool Boiling Heat Transfer and Critical heat flux phenomenon in an acoustic standing wave. Terrestrial and microgravity pool boiling heat transfer experiments were performed in the presence of a standing acoustic wave from a platinum wire resistance heater using degassed FC-72 Fluorinert liquid. The sound wave was created by driving a half wavelength resonator at a frequency of 10.15 kHz. Microgravity conditions were created using the 2.1 second drop tower on the campus of Washington State University. Burnout of the heater wire, often encountered with heat flux controlled systems, was avoided by using a constant temperature controller to regulate the heater wire temperature. The amplitude of the acoustic standing wave was increased from 28 kPa to over 70 kPa and these pressure measurements were made using a hydrophone fabricated with a small piezoelectric ceramic. Cavitation incurred during experiments at higher acoustic amplitudes contributed to the vapor bubble dynamics and heat transfer. The heater wire was positioned at three different locations within the acoustic field: the acoustic node, antinode, and halfway between these locations. Complete boiling curves are presented to show how the applied acoustic field enhanced boiling heat transfer and increased critical heat flux in microgravity and terrestrial environments. Video images provide information on the interaction between the vapor bubbles and the acoustic field. Part two is titled, Design and qualification of a microscale heater array for use in boiling heat transfer. This part is summarized herein. Boiling heat transfer is an efficient means of heat transfer because a large amount of heat can be removed from a surface using a relatively small temperature difference between the surface and the bulk liquid. However, the mechanisms that govern boiling heat transfer are not well understood. Measurements of wall te...
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 uniqu
An Instability Effect On Two Phase Heat Transfer For Subcooled Water Flowing Under Conditions Of Zero Gravity
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Author : S. Stephen Papell
language : en
Publisher:
Release Date : 1964
An Instability Effect On Two Phase Heat Transfer For Subcooled Water Flowing Under Conditions Of Zero Gravity written by S. Stephen Papell and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1964 with Resistance heating categories.
Subcritical, subcooled boiling heat-transfer data were obtained for distilled water flowing through a resistance-heated tube in a gravity-free environment lasting approximately 15 seconds. Two types of flow models were found to exist under identical test conditions. An instability initiated by a momentary interruption of flow forced the transition from a highly subcooled bubbly flow to a postulated slug flow that resulted in a 16-percent increase in local heat-transfer coefficients. The slug-flow regime was described as consisting of two phases in a highly nonequilibrium thermodynamic state. A duplication of test conditions that produced the transition in a zero-gravity environment failed to do so under Earth-gravity conditions.
Encyclopedia Of Two Phase Heat Transfer And Flow Ii Special Topics And Applications A 4 Volume Set
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Author : Thome John R
language : en
Publisher: World Scientific
Release Date : 2015-08-26
Encyclopedia Of Two Phase Heat Transfer And Flow Ii Special Topics And Applications A 4 Volume Set written by Thome John R and has been published by World Scientific this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015-08-26 with Technology & Engineering categories.
The aim of the two-set series is to present a very detailed and up-to-date reference for researchers and practicing engineers in the fields of mechanical, refrigeration, chemical, nuclear and electronics engineering on the important topic of two-phase heat transfer and two-phase flow. The scope of the first set of 4 volumes presents the fundamentals of the two-phase flows and heat transfer mechanisms, and describes in detail the most important prediction methods, while the scope of the second set of 4 volumes presents numerous special topics and numerous applications, also including numerical simulation methods.Practicing engineers will find extensive coverage to applications involving: multi-microchannel evaporator cold plates for electronics cooling, boiling on enhanced tubes and tube bundles, flow pattern based methods for predicting boiling and condensation inside horizontal tubes, pressure drop methods for singularies (U-bends and contractions), boiling in multiport tubes, and boiling and condensation in plate heat exchangers. All of these chapters include the latest methods for predicting not only local heat transfer coefficients but also pressure drops.Professors and students will find this 'Encyclopedia of Two-Phase Heat Transfer and Flow' particularly exciting, as it contains authored books and thorough state-of-the-art reviews on many basic and special topics, such as numerical modeling of two-phase heat transfer and adiabatic bubbly and slug flows, the unified annular flow boiling model, flow pattern maps, condensation and boiling theories, new emerging topics, etc.
Heat Transfer In Microgravity Systems
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Author :
language : en
Publisher:
Release Date : 1994
Heat Transfer In Microgravity Systems written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with Crystal growth categories.
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 ...
Microgravity Research In Support Of Technologies For The Human Exploration And Development Of Space And Planetary Bodies
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Author : National Research Council
language : en
Publisher: National Academies Press
Release Date : 2000-08-03
Microgravity Research In Support Of Technologies For The Human Exploration And Development Of Space And Planetary Bodies written by National Research Council and has been published by National Academies Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2000-08-03 with Science categories.
The frontier represented by the near solar system confronts humanity with intriguing challenges and opportunities. With the inception of the Human Exploration and Development of Space (HEDS) enterprise in 1995, NASA has acknowledged the opportunities and has accepted the very significant challenges. Microgravity Research in Support of Technologies for the Human Exploration and Development of Space and Planetary Bodies was commissioned by NASA to assist it in coordinating the scientific information relevant to anticipating, identifying, and solving the technical problems that must be addressed throughout the HEDS program over the coming decades. This report assesses scientific and related technological issues facing NASA's Human Exploration and Development of Space endeavor, looking specifically at mission enabling and enhancing technologies which, for development, require an improved understanding of fluid and material behavior in a reduced gravity environment.
Experimental And Numerical Investigations Of Two Phase Flow With Non Isothermal Boundary Conditions Under Microgravity Conditions
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Author : Sebastian Schmitt
language : en
Publisher: Cuvillier Verlag
Release Date : 2017-03-06
Experimental And Numerical Investigations Of Two Phase Flow With Non Isothermal Boundary Conditions Under Microgravity Conditions written by Sebastian Schmitt and has been published by Cuvillier Verlag this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-03-06 with Technology & Engineering categories.
Two-phase flow with a free surface, non-isothermal boundary conditions and heat and mass transfer over the free surface must be understood for a save operation of cryogenic upper stages with restart capability. This work is a foundational research carried out with numerical and experimental means. A mathematical and numerical model were developed that allow to describe such systems under varying gravity levels. The reorientation of cryogenic parahydrogen upon a sudden gravity step reduction was investigated experimentally using the drop tower at ZARM, University of Bremen. Influencing the motion and final shape of the free surface could be realized with a precisely defined wall temperature gradient. Heat and mass transfer over the free surface in a microgravity environment could be investigated numerically based on the experimental results of the SOURCE-II sounding rocket experiment. A transient simulation was carried out to study the coupled system between superheated container wall, subcooled liquid, free surface configuration and three-phase contact angle.
Microgravity Fluid Physics And Heat Transfer
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Author : V. K. Dhir
language : en
Publisher: Begell House Publishers
Release Date : 2000
Microgravity Fluid Physics And Heat Transfer written by V. K. Dhir and has been published by Begell House Publishers this book supported file pdf, txt, epub, kindle and other format this book has been release on 2000 with Fluid dynamics (Space environment) categories.