Two-phase frictional pressure drop in small rectangular channels

Ing Youn Chen*, Yi Min Chen, Jane Sunn Liaw, Chi-Chuan Wang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

24 Scopus citations


This study presents single-phase and two-phase frictional pressure drop data in three rectangular channels with channel width of 3, 6 and 9 mm, and a fixed gap of 3 mm. Adiabatic flows of air-water mixtures are tested at mass flux of 100-700 kg/m2 s and gas quality ranging from 0.001 to 0.8. The single-phase friction factors agree satisfactorily with the predictions of laminar and turbulent flows. The two-phase frictional pressure drop data are compared to predictions of homogeneous and Chisholm method, Wambsganss and Ide-Fukano correlations. It is found that none of the existing methods or correlations can predict the two-phase pressure gradient in rectangular channels satisfactorily. A modified C factor of Chisholm method considering the effect of aspect ratio is proposed from the empirical fit with the data sets of Wambsganss et al., Ide-Fukano, and this study. The corresponding mean deviations of the proposed correlation against the datasets are 24.99%, 10.83% and 10.73%, respectively. This correlation is applicable in wide rages of mass flux (50 < G < 700 kg/m2 s), gas quality (0.001 < x < 0.95), Martinelli parameter (0.05 < X < 20) and aspect ratio (0.1 < A < 1.0).

Original languageEnglish
Pages (from-to)60-66
Number of pages7
JournalExperimental Thermal and Fluid Science
Issue number1
StatePublished - 1 Oct 2007


  • C factor of Chisholm type correlation
  • Rectangular channel
  • Two-phase friction multiplier
  • Two-phase frictional pressure drop


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