The Prediction of Two-Phase Turbulence and Phase Distribution Phenomena Using a Reynolds Stress Model

[+] Author and Article Information
M. Lopez de Bertodano, S.-J. Lee, R. T. Lahey, D. A. Drew

Rensselaer Polytechnic Institute, Troy, NY 12180-3590

J. Fluids Eng 112(1), 107-113 (Mar 01, 1990) (7 pages) doi:10.1115/1.2909357 History: Received February 13, 1989; Online May 23, 2008


The void fraction distribution for turbulent bubbly air/water upflows and downflows in a pipe was analyzed using a three-dimensional two-fluid model. A τ − ε (i.e., Reynolds stress) turbulence model was used for the continuous (liquid) phase. The τ − ε transport equations yield all components of the Reynolds stress tensor for the liquid phase momentum equations. The effect of these stresses is to create a lateral pressure gradient that acts on the bubbles and effects their distribution. The lateral lift force on the bubbles has also been modelled. This lift force arises due to the relative motion of the bubble with respect to a nonuniform liquid velocity field. It has been observed experimentally that for upflows the bubbles concentrate near the wall while for downflows they move toward the center of the conduit. The model presented herein predicts these trends.

Copyright © 1990 by The American Society of Mechanical Engineers
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