One-dimensional drift-flux correlation for vertical upward two-phase flow in a large size rectangular channel

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

15 Scopus Citations
View graph of relations



Original languageEnglish
Pages (from-to)311-324
Journal / PublicationProgress in Nuclear Energy
Online published17 Oct 2018
Publication statusPublished - Jan 2019
Externally publishedYes


The study of two-phase flow in rectangular channels is of great importance due to their use in marine reactors, chemical reactors, test reactors, and neutron spallation sources. Due to the practical importance of the drift-flux correlation for two-phase flow analysis in industrial systems, distribution parameter and drift velocity have been studied for vertical upward two-phase flow in a large size rectangular channel. Due to the presence of liquid recirculation in the bubbly flow regime in large size rectangular channels, the distribution parameter, drift velocity, and flow regime transition criteria are different from those found in small or medium size rectangular channels. The use of hydraulic equivalent diameter as the characteristic length scale in channels with significant asymmetry and its effect on interfacial area concentration prediction are also discussed. Under these considerations a new drift-flux correlation has been developed for upward two-phase flow in large size rectangular channels. Comparison of the newly developed correlation with several datasets shows reasonable agreement.

Research Area(s)

  • Drift-flux model, Marine reactor, Rectangular channel, Research reactor, Void fraction