Heat Transfer and Fluid Flow in Minichannels and Microchannels

Heat exchangers with minichannel and microchannel flow passages are becoming increasingly popular due to their ability to remove large heat fluxes under single-phase and two-phase applications.

Heat Transfer and Fluid Flow in Minichannels and Microchannels methodically covers gas, liquid, and electrokinetic flows, as well as flow boiling and condensation, in minichannel and microchannel applications. Examining biomedical applications as well, the book is an ideal reference for anyone involved in the design processes of microchannel flow passages in a heat exchanger.

• Each chapter is accompanied by a real-life case study
• New edition of the first book that solely deals with heat and fluid flow in minichannels and microchannels
• Presents findings that are directly useful to designers; researchers can use the information in developing new models or identifying research needs

Mechanical Engineers, Process Engineers, Thermal systems specialists

About the Authors

Preface

Nomenclature

Greek Symbols

Subscripts

Superscripts

Operators

Chapter 1. Introduction

1.1 Need for smaller flow passages

1.2 Flow channel classification

1.3 Basic heat transfer and pressure drop considerations

1.4 The potential and special demands of fluidic biological applications

1.5 Summary

1.6 Practice problems

References

Chapter 2. Single-Phase Gas Flow in Microchannels

2.1 Rarefaction and wall effects in microflows

2.2 Gas flow regimes in microchannels

2.3 Pressure-driven steady slip flows in microchannels

2.4 Pulsed gas flows in microchannels

2.5 Thermally driven gas microflows and vacuum generation

2.6 Heat transfer in microchannels

2.7 Future research needs

2.8 Solved examples

2.9 Practice problems

References

Chapter 3. Single-Phase Liquid Flow in Minichannels and Microchannels

3.1 Introduction

3.2 Pressure drop in single-phase liquid flow

3.3 Total pressure drop in a microchannel heat exchanger

3.4 Roughness effects

3.5 Heat transfer in microchannels

3.6 Roughness effects on heat transfer in microchannels and minichannels

3.7 Heat transfer enhancement with nanofluids

3.8 Microchannel and minichannel geometry optimization

3.9 Enhanced microchannels

3.10 Solved examples

3.11 Practice problems

Appendix A

References

Chapter 4. Single-Phase Electrokinetic Flow in Microchannels

4.1 Introduction

4.2 Electrical double layer field

4.3 Electroosmotic flow in microchannels

4.4 Experimental techniques for studying electroosmotic flow

4.5 Electroosmotic flow in heterogeneous microchannels

4.6 AC electroosmotic flow

4.7 Electrokinetic mixing

4.8 Electrokinetic sample dispensing

4.9 Electroosmotic flow with joule heating effects

4.10 Practice problems

References

Chapter 5. Flow Boiling in Minichannels and Microchannels

5.1 Introduction

5.2 Nucleation in minichannels and microchannels

5.3 Nondimensional numbers used in microchannel flow boiling

5.4 Flow patterns, instabilities, and heat transfer mechanisms during flow boiling in minichannels and microchannels

5.5 Critical Heat Flux in microchannels

5.6 Stabilization of flow boiling in microchannels

5.7 Predicting heat transfer in microchannels

5.8 Pressure drop during flow boiling in microchannels and minichannels

5.9 Adiabatic two-phase flow

5.10 Practical cooling systems with microchannels

5.11 Enhanced microchannel flow boiling systems

5.12 Novel open microchannels with manifold

5.13 Solved examples

5.14 Practice problems

References

Chapter 6. Condensation in Minichannels and Microchannels

6.1 Introduction

6.2 Flow regimes

6.3 Void fraction

6.4 Pressure drop

6.5 Heat transfer coefficients

6.6 Conclusions

6.7 Exercises

References

Chapter 7. Biomedical Applications of Microchannel Flows

7.1 Introduction

7.2 Microchannels to probe transient cell adhesion under flow

7.3 Blood capillaries and “optimal bumpiness” for minimization of flow resistance

7.4 Circular cross-section microchannels for blood flow research

7.5 Nanoscale roughness in microtubes: effects on cell adhesion and biological applications

7.6 Microchannels and minichannels as bioreactors for long-term cell culture

7.7 Microspherical cavities for cell sorting and tumor growth models

7.8 Generation of normal forces in cell detachment assays

7.9 Small-bore microcapillaries to measure cell mechanics and adhesion

7.10 Solved examples

7.11 Practice problems

References

Index