Analysis and Measurement of Bubble Dynamics and Associated Flow Field in Subcooled Nucleate Boiling Flows Page: 3 of 37
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Table of Contents
List of Symbols .................................................................................................................. v
1 Introduction ...................................................................................................... 1
2 Project Accomplishments................................................................................ 3
3 Model Development......................................................................................... 4
3.1 Bubble Interaction (Coalescence) Probability ............................................. 4
3.1.1 Basic Assumptions ........................................................................................... 4
3.1.2 Probabilities of Two-Bubble Interaction ....................................................... 4
3.1.3 Probabilities of Multiple Interactions During Bubble Life Span................. 7
3.1.4 Conditional Bubble Interaction Probability and Ergodic Principle............ 8
3.2 Mechanisms of Flow Boiling Heat Transfer.................................................. 8
3.2.1 Forced Convection............................................................................................ 8
3.2.2 Transient Conduction....................................................................................... 9
3.2.3 Microlayer Evaporation................................................................................... 9
3.3 Energy Conservation Revisit............................................................................10
3.4 Critical Heat Flux..............................................................................................10
3.5 Improved Heat Transfer Model Based on Bubble Motions............................11
4 Model Validation................................................................................................12
4.1 Active Nucleation Site Density .........................................................................12
4.2 Bubble Growth...................................................................................................14
4.2.1 Measured Bubble Growth Rate .......................................................................14
4.3 Results on Bubble Departure and Bubble Lift-off .........................................14
4.3.1 Bubble Departure Radius .................................................................................14
4.3.2 Bubble Lift-Off Radius .....................................................................................15
4.4 Model Prediction on Boiling Curves................................................................17
4.4.1 Experimental Data Overview ...........................................................................17
4.4.2 Comparison for R134a Data with Model Predictions at 400kPa..................18
4.4.3 Model Prediction at Higher Pressures......................................................... 21
4.4.4 Comparison of Critical Heat Flux ............................................................... 25
4.4.5 Comparison to Water Data in the Literature ............................................. 26
5 Conclusions .................................................................................................... 28
6 Suggestion...........................................................................................................29
Publications ..................................................................................................................... 30
References........................................................................................................................ 31
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Jones, Barclay G. Analysis and Measurement of Bubble Dynamics and Associated Flow Field in Subcooled Nucleate Boiling Flows, report, October 1, 2008; United States. (https://digital.library.unt.edu/ark:/67531/metadc927385/m1/3/: accessed July 16, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.