Heat transfer in intermittent air-water flows - Part I: Horizontal tube

G. Hetsroni, B. G. Hu, J. H. Yi, A. Mosyak, L. P. Yarin, G. Ziskind

Research output: Contribution to journalArticlepeer-review

26 Scopus citations


This paper presents a study on the heat transfer in intermittent air-water flows in a horizontal tube. The experimental technique is based on infrared thermography of an electrically heated wall of the tube, providing both visualization of the temperature field and measurements of the local wall temperature. Measurements of bubble size and frequency are correlated to the measurements of the local wall temperature fluctuations and heat transfer coefficient. The water and air Froude numbers varied from 0.9 to 2.0 and from 0.03 to 0.43, respectively. On the upper part of the tube, the effect of the gas Froude number is as follows. In the range FrG < 0.13 heat transfer decreases with increasing FrG, while in the range 0.13 < FrG < 0.43 the heat transfer increases when FrG increases. On the lower part of the tube the heat transfer coefficient does not depend on the gas Froude number.

Original languageEnglish
Pages (from-to)165-188
Number of pages24
JournalInternational Journal of Multiphase Flow
Issue number2-7
StatePublished - 1 Jan 1998
Externally publishedYes


  • Air-water flow
  • Heat transfer
  • Horizontal tube

ASJC Scopus subject areas

  • Mechanical Engineering
  • Physics and Astronomy (all)
  • Fluid Flow and Transfer Processes


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