Two-phase flow pattern for R-134a inside a 6.5-mm (0.25-in.) smooth tube

Chi-Chuan Wang*, Ching shan Chiang, Sheih pei Lin, Ding chung Lu

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

12 Scopus citations


The two-phase flow pattern and frictional pressure characteristics for R-134a inside a 6.5-mm (0.25-in.) smooth tube are reported in this study. The range of mass flux is between 100 and 500 kg/m 2 ·s, and the vapor quality is between 0.02 and 0.95. It is shown that the flow pattern map proposed by Weisman et al. (1979) gave the best agreement with the present experimental data. In addition, a correlation for the two-phase multipliers was proposed that can correlate the present test data with reasonably good accuracy.

Original languageEnglish
Pages (from-to)803-812
Number of pages10
JournalASHRAE Transactions
Issue number1
StatePublished - 31 Dec 1997
EventProceedings of the 1997 ASHRAE Winter Meeting - Philadelphia, PA, USA
Duration: 26 Jan 199729 Jan 1997

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