期刊
EXPERIMENTAL THERMAL AND FLUID SCIENCE
卷 33, 期 4, 页码 579-590出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.expthermflusci.2008.12.004
关键词
Nucleate boiling; Roughness; Surface material; Halocarbon refrigerants
资金
- The State of Sao Paulo Research Foundation-FAPESP [01/00417-1, 06/52089-1]
This paper presents results of an experimental investigation carried out to determine the effects of the surface roughness of different materials on nucleate boiling heat transfer of refrigerants R-134a and R-123. Experiments have been performed over cylindrical surfaces of copper, brass and stainless steel. Surfaces have been treated by different methods in order to obtain an average roughness, Ra, varying from 0.03 mu m to 10.5 mu m. Boiling curves at different reduced pressures have been raised as part of the investigation. The obtained results have shown significant effects of the surface material, with brass being the best performing and stainless steel the worst. Polished surfaces seem to present slightly better performance than the sand paper roughened. Boiling on very rough surfaces presents a peculiar behavior characterized by good thermal performance at low heat fluxes, the performance deteriorating at high heat fluxes with respect to smoother surfaces. (C) 2008 Elsevier Inc. All rights reserved.
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