Multi-holdups in co-current stratified flow in inclined tubes

A. Ullmann, M. Zamir, S. Gat, N. Brauner*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Maps of the multi-holdup regions in co-current and countercurrent flows are presented in terms of the controlling non-dimensional parameters. These maps clearly demonstrate the symmetrical relationship between upward and downward co-current inclined flows. The feasibility of obtaining multi-holdups in co-current up flow is validated experimentally using oil-water system. The multiple holdups are shown to be associated with hysteresis phenomenon. The introduction of the multi-holdup regions on flow-pattern maps of various gas-liquid and liquid-liquid systems, indicates that these regions correspond to operational conditions where stratified flow was experimentally observed. The significance of multi-holdups phenomena to transition from stratified flow to other bounding flow patterns is discussed.

Original languageEnglish
Pages (from-to)1565-1581
Number of pages17
JournalInternational Journal of Multiphase Flow
Issue number10
StatePublished - Oct 2003


  • Co-current
  • Holdup
  • Inclined
  • Multiple
  • Stratified


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