Some observations of foaming characteristics in the nucleate boiling performance of refrigerant-oil mixtures

Chi-Chuan Wang*, Yur Tsai Lin, Hong Dao Chung, Y. Z Robert Hu

*Corresponding author for this work

研究成果: Conference article同行評審

6 引文 斯高帕斯(Scopus)

摘要

This paper discusses the effect of lubricant oil on nucleate boiling performance for a smooth tube. The lubricant oil used in the investigation includes 3GS and 5GS, and the working refrigerant is R-22. Experiments were conducted at saturation temperatures of -5°C, 4.4°C, and 20°C. For refrigerant-oil mixtures, the heat transfer coefficients, h, decrease with increase of oil concentrations at Ts = 20°C. Conversely, for Ts = -5°C, the heat transfer coefficients for refrigerant-oil mixtures may be larger than those of pure refrigerants at low oil concentration. Possible explanations for this phenomenon include (1) the effect of physical properties, especially that of surface tension, and (2) foaming characteristics.

原文English
期刊ASHRAE Transactions
105
出版狀態Published - 1 一月 1999
事件Proceedings of the 1999 ASHRAE Winter Meeting - Chicago, IL, USA
持續時間: 23 一月 199927 一月 1999

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