Some observations of the two-phase flow characteristics of R-125 and R-407C within a 3-mm diameter tube

Kai Shing Yang*, Ing Young Chen, Robert Hu, Chi-Chuan Wang

*Corresponding author for this work

研究成果: Conference article同行評審

5 引文 斯高帕斯(Scopus)

摘要

Two-phase flow pattern and the frictional characteristics of refrigerants R-407C and R-125 inside a 3-mm-diameter tube are reported in this study. Tests were performed with a mass flux in the range of 300∼1000 kg/m2·s. It is.found that the development of flow pattern for R-125 is at a lower vapor velocity than that of R-407C, due to its larger vapor density. A modified flow-regime map applicable for a 3-mm-diameter tube is developed by modifying the abscissa axis of superficial vapor velocity in the conventional-flow map. This flow pattern map is capable of describing the present data set along with that of Yang and Shieh (2001). Test results of the frictional pressure gradient are compared with several empirical correlations. It is found that the Friedel correlation shows the best predictive ability, having a mean deviation of about 20%.

原文English
頁(從 - 到)529-534
頁數6
期刊ASHRAE Transactions
108 PART 2
出版狀態Published - 1 一月 2002
事件ASHRAE Transactions 2002 - Honolulu, HI, United States
持續時間: 22 六月 200226 六月 2002

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