Improved flow pattern map for accurate prediction of the heat transfer coefficients during condensation of R-134a in smooth horizontal tubes and within the low-mass flux range

R. Suliman, L. Liebenberg, J. P. Meyer

Research output: Contribution to journalArticlepeer-review

Abstract

This paper presents an improved flow pattern map for predicting the heat transfer coefficients during condensation of R-134a inside a smooth horizontal tube. Experimental tests were conducted over the low-mass flux range of 75-300 kg/m2 s, at a nominal saturation temperature of 40 °C, and with the test section vapour qualities ranging from 0.76 down to 0.03. This represents points within the annular, intermittent and stratified flow regimes. The results were used to modify the Thome-El Hajal flow pattern map to include a transition region between the stratified-wavy and annular or intermittent flow regimes. The revised flow pattern-based heat transfer correlation predicted the experimental data to a mean deviation of less than 6%.

Original languageEnglish (US)
Pages (from-to)5701-5711
Number of pages11
JournalInternational Journal of Heat and Mass Transfer
Volume52
Issue number25-26
DOIs
StatePublished - Dec 2009
Externally publishedYes

Keywords

  • Condensation
  • Flow pattern
  • Heat transfer
  • Refrigerant
  • Smooth tube

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes

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