Two-phase heat transfer characteristics for R-22/R-407C in a 6.5-mm smooth tube

Chi-Chuan Wang*, Ching Shan Chiang

*Corresponding author for this work

Research output: Contribution to journalArticle

32 Scopus citations

Abstract

Two-phase friction and heat transfer characteristics for R-22/R-407C inside a 6.5-mm smooth tube are reported in this study. The heat transfer results for G=100 and 400 kg/m2 s were reported in the present study, and the adiabatic frictional pressure drop was recorded in the range of 100 to 700 kg/m2 s. It is found that the development of flow pattern for R-407C falls behind R-22. This may explain the lower pressure drops for R-407C. The major heat transfer mechanism at low mass flux is nucleate boiling, and virtually becomes the convective evaporation as mass flux increase to G=400 krg/m2 s, Meanwhile, the reduction of heat transfer coefficients for R-407C mixtures are especially profound at low mass flux, and the reduction of heat transfer coefficient decreases with the increase of mass flux.

Original languageEnglish
Pages (from-to)550-558
Number of pages9
JournalInternational Journal of Heat and Fluid Flow
Volume18
Issue number6
DOIs
StatePublished - 1 Jan 1997

Keywords

  • Flow pattern
  • Heat transfer
  • Pressure drops
  • R-22, R-407C
  • Two-phase flow

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