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Journal of Enhanced Heat Transfer
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ISSN Druckformat: 1065-5131
ISSN Online: 1563-5074

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Journal of Enhanced Heat Transfer

DOI: 10.1615/JEnhHeatTransf.v13.i1.60
pages 85-97

Pool Boiling of Refrigerants R-134a and R-404A on Porous and Structured Tubes Part II. Heat Transfer Performance

Chien-Yuh Yang
National Central University
Chih-Feng Fan
Department of Mechanical Engineering, National Central University, Chung-Li, Taoyuan, 32054, Taiwan

ABSTRAKT

This is the second part of a two-part experimental work that is intended to provide a further understanding of the physical phenomenon for refrigerants R-134a and R-404A boiling on structured and porous tubes. This paper provides measurement results of heat transfer performance on smooth and enhanced tubes. The results show that the relation of heat transfer performance to the heat flux can be well explained by the bubble dynamics as observed in Part I of this study.
The present study also supports the suggestion of Chen et al. [2002] that for tubes with surface pores or with surface pores connected by sub-surface tunnel, the high performance of structured surfaces is largely brought about by evaporation inside the tunnels. For a surface with big openings, most of heat load is transported by sensible heat, especially at a high flux.


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