A two-fluid model for stratified flows with curved interfaces

N. Brauner*, D. Moalem Maron, J. Rovinsky

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


This study is motivated by the need to develop a practical tool for predicting the interface shape in stratified flow of a general two-fluid system. A configuration of a curved interface is considered. A two-fluid model is used to solve the momentum equations for a variable interface curvature. Energy considerations provide a closure relation for the interface curvature. The analysis identifies all the input dimensionless parameters which determine the solution for the stratified flow pattern. When these are given, a complete solution of the problem is obtained, including the interface shape, in situ hold-up and pressure drop. The validity of the two-fluid model is evaluated by comparing its prediction with available experimental data and with the results of exact analytical solutions for laminar flows with curved interfaces. Thus, the conventional two-fluid model has been extended to tackle stratified flow with curved interfaces and various flow regimes, in which case analytical solutions are complicated and restricted to laminar flows.

Original languageEnglish
Pages (from-to)975-1004
Number of pages30
JournalInternational Journal of Multiphase Flow
Issue number6
StatePublished - Sep 1998


  • Curved interface
  • Stratified flow
  • Two-fluid model


Dive into the research topics of 'A two-fluid model for stratified flows with curved interfaces'. Together they form a unique fingerprint.

Cite this