A visual study of two-phase flow patterns of HFC-134a and lubricant oil mixtures

Somchai Wongwises, Tawatchai Wongchang, Jatuporn Kaewon, Chi-Chuan Wang

研究成果: Article

29 引文 斯高帕斯(Scopus)

摘要

The two-phase flow patterns of HFC-134a with lubricant oil mixtures inside a smooth horizontal tube were experimentally elucidated. Tests were performed in an inside diameter of 7.8 mm having a lubricating oil concentration of 5%. Tests were made of mass fluxes ranging between 150 and 590 kg/m2 s. The most obvious difference from oil-free cases reported is the presence of froth flow pattern. Apparently, this flow pattern is related to the increase of surface tension and viscosity. With the presence of lubricant oil, the onset of transition from stratified flow region to annular flow regime shifted to a lower value of superficial gas velocity. In addition, the tearing phenomenon of the refrigerant-oil mixtures may be related to its relevant properties such as wettability and surface tension.

原文English
頁(從 - 到)13-22
頁數10
期刊Heat Transfer Engineering
23
發行號4
DOIs
出版狀態Published - 1 一月 2002

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