Liu / Kulacki The Effect of Surface Wettability on the Defrost Process

1. Auflage 2018
ISBN: 978-3-030-02616-5
Verlag: Springer International Publishing
Format: PDF
Kopierschutz: 1 - PDF Watermark

E-Book, Englisch, 124 Seiten

Reihe: SpringerBriefs in Applied Sciences and Technology

This SpringerBrief presents a recent advancement in modeling and measurement of the effect of surface wettability on the defrost process. Carefully controlled laboratory measurements of the defrosting of cooled surfaces are used to reveal the effect of surface wetting properties on the extent and speed of frost removal by melting or slumping. The experiments are accompanied by visualization of frost removal at several defrosting conditions. Analysis breaks the defrost process into three stages according to the behavior of the meltwater. Surface wetting factors are included, and become significant when sufficient meltwater accumulates between the saturated frost layer and the surface. The book is aimed at researchers, practicing engineers and graduate students.

Yang Liu, is a senior engineer at Tsinghua-Zhongcheng United Research Center on Intelligent manufacturing.  She received her PhD in mechanical engineering at University of Minnesota in 2017.  Prior to studying at University of Minnesota, she worked as a gas turbine application engineer and field service engineer at GE China for five years.  Her current work is on the vibration measurement and control.

Autoren/Hrsg.

Liu, Yang

Kulacki, Francis A.

Inhaltsverzeichnis

1;Preface;6
2;Contents;8
3;Nomenclature;10
3.1;Greek Symbols;11
3.2;Subscripts;12
4;Chapter 1: Introduction;13
5;Chapter 2: Prior Research;15
5.1;2.1 Frost Formation;15
5.1.1;Frost Nucleation;15
5.1.2;Experiments and Correlations;16
5.1.3;Analytical Models;18
5.1.4;Effects of Surface Wettability;19
5.2;2.2 The Defrost Process;22
5.2.1;Effect of Surface Wettability;22
5.2.2;Frost Release and Condensate Retention;24
5.2.3;Analytical Models;28
5.2.4;Ice Adhesion;31
5.3;2.3 Summary;33
6;Chapter 3: A Model of the Defrost Process;34
6.1;3.1 General Description of the Melting Model;34
6.2;3.2 Meltwater Absorption;36
6.3;3.3 Meltwater Accumulation;39
6.4;3.4 Meltwater Draining;41
6.5;3.5 Defrost Time and Efficiency;44
6.6;3.6 Slumping Criteria;44
6.6.1;Force Balance in the Absorption Process;46
6.6.2;The Force Balance During Meltwater Accumulation;47
6.6.3;The Force Balance During Meltwater Draining;50
7;Chapter 4: Solution Methods;51
7.1;4.1 Absorption;51
7.2;4.2 Accumulation;53
7.3;4.3 Draining;53
7.4;4.4 Slumping Criteria;56
8;Chapter 5: Experimental Design;59
8.1;5.1 Apparatus;59
8.2;5.2 Design Analysis;60
8.2.1;Chamber Energy Balance;61
8.2.2;Heat Transfer Coefficient on the Test Surface and Frost;62
8.2.3;Heat Flux at the Test Surface;65
8.2.4;Heat Sink;67
8.2.5;Capacity of the Thermoelectric Module;67
8.3;5.3 Data Acquisition and Uncertainty Estimates;69
8.3.1;Uncertainty Estimates;70
8.4;5.4 Surface Preparation and Characterization;71
9;Chapter 6: Results;74
9.1;6.1 Analytical and Numerical Results;74
9.1.1;Slumping Criterion;86
9.2;6.2 Experimental Results;91
9.3;6.3 Comparison of Predictions and Measurements;108
10;Chapter 7: Conclusion;113
10.1;7.1 Future Research Pathways;115
11;Instruments and Precision;117
12;Slumping Image;119
13;References;120