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Contemporary Perspectives on Flow Boiling Instabilities in Microchannels and Minichannels

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Contemporary Perspectives on Flow Boiling Instabilities in Microchannels and Minichannels

Yoav Peles
Rensselaer Polytechnic Institute, 110, 8th Street, Troy NY, 12180-3590; University of Central Florida Department of Mechanical and Aerospace Engineering Pegasus Blvd., P.O. Box 162450, Orlando, FL 32816-245012760, USA


Literature concerning flow boiling instabilities in microchannels is available through quite a few journal and conference papers. However, these papers are scattered through assorted publication avenues and typically address one or several narrow aspects of flow instabilities. They generally target an audience with an extensive background and prior knowledge of the field. Practitioners who are not experts in flow instabilities and novice researchers to this fascinating field have difficulties comprehending the knowledge communicated in these papers. This book was written to bridge this gap and accelerate the learning process for these individuals.

152 pages, © 2012


Chapter 1: Introduction
Chapter 2: Fundamental Concepts of Flow Boiling
2.1 Introduction
2.2 Nucleation
2.2.1 Homogenous Nucleation
2.2.2 Heterogeneous Nucleation
2.3 Pool Boiling
2.4 Flow Boiling
2.4.1 Bubbly Flow
2.4.2 Slug Flow
2.4.3 Annular Flow
Chapter 3: Rapid Bubble Growth
3.1 Introduction
3.2 Mechanism A—Liquid Superheat
3.2.1 Hsu's Model
3.2.2 Application of Hsu's Model for Microchannels
3.2.3 Suppression of Mechanism A by Surface Topography Modification Brief History of Engineered Heat Transfer Surfaces
3.3 Mechanism B—Bubble Dynamics and Elevated Pressures
3.4 Models for Pressure Waves inside a Microchannel
3.4.1 Fogg and Goodson Model
3.4.2 Gedupudi et al.44 Model for Constant Inlet Mass Flow Rate Inlet Conditions Governing Equations for Flow inside the Channel Bubble Growth Rate Conservation of Mass Equation Momentum Equation
3.4.3 Numerical Model by Mukherjee and Kandlikar
Chapter 4: Ledinegg (or Flow Excursion) Instability
4.1 Introduction
4.2 The Stability Criterion—Mathematical Analysis
4.3 Pressure-Drop–Mass Flux Demand Curve—the Origin of the Negative Slope
4.3.1 Kinematic Viscosity—Instability Culprit in Microchannels
4.4 The Onset of Flow Instability
4.5 Solution—Inlet Restrictors
Chapter 5: The Two-Phase Pressure-Drop—Mass Flux Curve
5.1 Introduction
5.2 Frictional Pressure Drop
5.2.1 Inlet Head
5.2.2 Exit Head
5.2.3 Liquid Single-Phase Frictional Pressure Drop
5.2.4 Two-Phase Frictional Pressure Drop—Homogenous Flow Model
5.2.5 Two-Phase Frictional Pressure Drop—Separated Flow Model
5.3 Acceleration Pressure Drop
5.4 Pressure-Drop–Mass Flux Curve—Ledinegg Stability Analysis
Chapter 6: Upstream Compressible Volume Instability
6.1 Introduction
6.2 Conservation of Mass Equation
6.3 Gas Law Equation
6.4 Channel's Momentum Equation
6.5 Rapid Bubble Growth and Upstream Compressibility
Chapter 7: Parallel Channel Flow Instability
7.1 Introduction
7.2 Instability in a System with Two Parallel Channels
7.3 Instability in a System with n-Parallel Channels
7.3.1 Criterion for a Single Channel
7.3.2 Criterion for Two Parallel Channels
7.3.3 Criterion for Three Parallel Channels
7.4 Parallel Channel Instability with Upstream Compressible Instability
7.5 Thermal Connection and Separation
Chapter 8: The Critical Heat Flux (CHF) Condition
8.1 Introduction
8.2 Variables Controlling the CHF Condition
8.3 CHF Mechanisms
8.3.1 Departure from Nucleate Boiling
8.3.2 Dryout
8.3.3 CHF in Microchannels
8.4 Dryout
8.4.1 Effect of Mass Flux
8.4.2 Effect of Channel Diameter
8.4.3 System Pressure Effect
8.5 Departure from Nucleate Boiling
8.6 CHF in the Transition Regime from DNB to Dryout
8.7 Effect of Flow Oscillations on CHF in Microchannels
8.8 CHF Correlations
8.8.1 The Katto and Katto and Ohno Correlation
8.8.2 The Bowring Correlation
8.8.3 Microchannel Correlations
8.9 Kinetic Theory and CHF
Chapter 9: System Pressure and Type of Fluid Effects
9.1 Introduction
9.2 Effect on the Ledinegg Instability
9.3 Effect on the Rapid Bubble Growth Instability