Theoretical analysis of the onset of gas entrainment from a stratified region through multiple branches

W. Saleh, R. C. Bowden, Ibrahim Hassan, L. Kadem

Research output: Contribution to journalArticle

3 Citations (Scopus)


A theoretical analysis has been developed to predict the critical height of the onset of gas entrainment (OGE) during dual and triple discharge from a stratified two-phase region. The two and three discharge branches are mounted on a circular wall, resembling a circular reservoir of a CANDU header-feeder configuration. A point sink model has been developed to predict the critical height and to map the velocities and acceleration flow fields during OGE. The model was verified by comparing the theoretically predicted critical height with the available experimental results. The theoretically predicted critical height is found to be a function of the branch Froude number, the location of the secondary branch with respect to the primary branch, and the angle between the branches. The effect of these variables on the predicted OGE height was investigated and is presented in this paper. Predictions of the critical height were shown to be within 25% of experimental values in both dual and triple discharge.

Original languageEnglish
Pages (from-to)1348-1357
Number of pages10
JournalInternational Journal of Multiphase Flow
Issue number10
Publication statusPublished - Dec 2011
Externally publishedYes



  • Critical height
  • Header-feeder
  • Onset of gas entrainment

ASJC Scopus subject areas

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

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