Two-group drift-flux model for closure of the modified two-fluid model

Caleb S. Brooks, Sidharth S. Paranjape, Basar Ozar, Takashi Hibiki, Mamoru Ishii

Research output: Contribution to journalArticlepeer-review


In an effort to improve the prediction of void fraction and heat transfer characteristics in two-phase systems, closure relations to the one-dimensional modified two-fluid model are addressed. The drift-flux general expression is extended to two bubble groups in order to describe the void weighted mean gas velocities of spherical/distorted (group-1) bubbles and cap/slug/churn-turbulent (group-2) bubbles. Therefore, correlations for group-1 and group-2 distribution parameters and drift velocities are proposed and evaluated with experimental data. Furthermore, the covariance in the convective flux of the one-dimensional two-fluid model is addressed and interpreted with the available database. The dataset chosen for evaluation of the two-group drift-flux general expression contains 126 total data points taken in an annulus geometry. The proposed distribution parameters show an agreement within ±4.9% and ±1.2% for group-1 and group-2 data, respectively. The overall estimation of group-1 and group-2 void weighted mean gas velocity calculated with the newly proposed two-group drift-flux general expression shows an agreement of ±11.8% and ±17.7%, respectively.

Original languageEnglish (US)
Pages (from-to)196-208
Number of pages13
JournalInternational Journal of Heat and Fluid Flow
StatePublished - Oct 2012
Externally publishedYes


  • Annulus
  • Bubbly flow
  • Cap bubble
  • Covariance
  • Distribution parameter
  • Drift velocity
  • Drift-flux model
  • Interfacial area transport
  • Two-fluid model
  • Void fraction

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes


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