Visual Observation of Two-Phase Flow Pattern of R-22, R-134a, and R-407C in a 6.5-mm Smooth Tube

Chi-Chuan Wang*, Ching Shan Chiang, Ding Chong Lu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

92 Scopus citations

Abstract

Two-phase flow pattern and friction characteristics for R-22, R-134a, and R-407C inside a 6.5 mm smooth tube are reported in this study. The range of mass flux is between 50 and 700 kg/(m2 s). The experimental data show that the two-phase friction multipliers are strongly related to the flow pattern. For a stratified, wavy flow pattern a mass-flux dependence of the multipliers is seen. The flow pattern transition for the mixture refrigerant shows a considerable delay, compared with that of pure refrigerant.

Original languageEnglish
Pages (from-to)395-405
Number of pages11
JournalExperimental Thermal and Fluid Science
Volume15
Issue number4
DOIs
StatePublished - Nov 1997

Keywords

  • Flow pattern
  • Pressure drops
  • R-134a
  • R-22
  • R-407C
  • Two-phase

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