Experimental study on saturation pool boiling heat transfer characteristics of R245fa on the surface covered by sintered copper powder

Case Studies in Thermal Engineering

Hongwei Jia¹  Yi Ding²  Ruiqi Min³  Lingyun Pan³  Liaofei Yin³  Chao Dang³ 

[1] Corresponding author. Beijing Key Laboratory of Flow and Heat Transfer of Phase Changing in Micro and Small Scale, Beijing Jiaotong University, Beijing, 100044, China.;Key Laboratory of Thermal Science and Power Engineering of Ministry of Education, Department of Energy and Power Engineering, Tsinghua University, Beijing, 100084, China;Beijing Key Laboratory of Flow and Heat Transfer of Phase Changing in Micro and Small Scale, Beijing Jiaotong University, Beijing, 100044, China;

关键词: Pool boiling;    Refrigerant R245fa;    Sintered copper powder;    Heat transfer enhancement;    Visualization;   

DOI  :  

来源: DOAJ

【 摘 要 】

In this paper, the mechanism of pool boiling heat transfer enhancement on the surface covered with sintered copper powder porous layer has been investigated. The refrigerant R245fa with great application prospect in electronic cooling field was selected as the test fluid. According to the results, the boiling heat transfer performance of R245fa could be effectively enhanced by attaching the sintered copper powder porous layer to the plain copper surface. Even when the wall superheat was as low as 2.2 °C, the sintered copper powder surface with the particle size of 110 μm and thickness of 0.6 mm could still be efficiently triggered to boiling. The heat transfer coefficient and CHF were significantly improved up to 247.71% and 255.15% compared with that of plain copper surface, respectively. However, with the thickness of porous layer increased from 0.6 mm to 0.9 mm, the maximum heat transfer coefficient for the enhanced surface with particle size of 30 μm went up to 136.01%, while the CHF value decreased by 92.52%. For 65 μm and 110 μm surfaces, the change of porous layer thickness had little effect on the heat transfer coefficient in the initial boiling stage, but presented the contrary influence trend at high heat flux conditions.

【 授权许可】

Unknown