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

Research output: Contribution to journalConference article

6 Scopus citations

Abstract

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.

Original languageEnglish
JournalASHRAE Transactions
Volume105
StatePublished - 1 Jan 1999
EventProceedings of the 1999 ASHRAE Winter Meeting - Chicago, IL, USA
Duration: 23 Jan 199927 Jan 1999

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