Microgravity Two-phase Flow and Heat Transfer (Space Technology Library, 19)

✍ Scribed by Kamiel S. Gabriel

• Publisher: Springer
• Year: 2006
• Tongue: English
• Leaves: 252
• Category: Library

✦ Synopsis

Multiphase thermal systems (involving more than one phase or one component) have numerous applications in aerospace, heat-exchanger, transport of contaminants in environmental systems, and energy transport and energy conversion systems. Advances in understanding the behaviour of multiphase thermal systems could lead to higher efficiency energy production systems, improved heat-exchanger design, and safer and enhanced treatment of hazardous waste. But such advances have been greatly hindered by the strong effect of gravitational acceleration on the flow. Depending on the flow orientation and the phase velocities, gravitational forces could significantly alter the flow regime, and hence the pressure-drop and heat-transfer coefficients associated with the flow. A reduced gravity environment (or "microgravity"), provides an excellent tool to study 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.

✦ Table of Contents

Table of Contents
Preface
About the Author
Acknowledgements
Nomenclature
List of Figures
List of Tables
Introduction
Applications of Two-Phase Flow at Microgravity Conditions
Simulation of Microgravity Conditions
Scope of this Book
Classification of Gas–Liquid Flow Patterns
Horizontal Flows On-Ground
Vertical Flows On-Ground
Flow Patterns at Reduced-Gravity Conditions
Flow Pattern Transition Models
Models for Horizontal Flows On-Ground
Models for Vertica lUpward Flows On-Ground
Extension o fGround Models to Conditions at Reduced Gravity
Modeling at Reduced Gravity
Gas–Liquid Flow Pressure Drop
Momentum Equations
Empirical Methods
Experimental Results at Reduced-Gravity Conditions
Comparison of Experimental Data with Empirical Methods
Void Fraction
Introduction
Instrumentation
Experimental Results and Comparisons
Void Fraction Distribution Coefficient
Signal Analysis and Probability Density Functions
Conclusions
Gas–Liquid Flow Heat Transfer
Experimental Facility and Procedure
Transient Effects
Experimental Results
Measurement Error and Uncertainty
Local Heat Transfer Coefficients
Mixed Convection
Empirical Correlations
Modeling Periodic Slug Flows Using a Volumeof Fluid Method
Assumptions
Governing Equations
Interface-Tracking Model
Boundary Conditions
Superficial Two- Phase Flow Parameters
Numerical Implementation
Volume of FluidInterface-Tracking Method
Model Geometry
Simulation Results
Conclusions
Summary and Conclusion
Appendix A
Appendix B
References
Index