Modeling of Transient Stratified Flow in Vertical Tube Assemblies

[+] Author and Article Information
P. F. Peterson

Department of Nuclear Engineering, University of California, Berkeley, CA 94720

A. Akbarzadeh

Department of Mechanical Engineering, Royal Melbourne Institute of Technology, Melbourne, Australia

J. Heat Transfer 114(4), 983-989 (Nov 01, 1992) (7 pages) doi:10.1115/1.2911910 History: Received August 01, 1991; Revised March 01, 1992; Online May 23, 2008


This study considers a case of uniform flow into the bottom of a rectangular vertical tube array, with outflow from a point sink in one bottom corner. Experimental results show that, upon a step change to a higher density, a clearly defined density interface forms, and buoyancy forces cause channeling of the dense fluid. The tube array geometry permits an analytic solution, which agrees well with the experiments. Standard control-volume numerical methods, however, predict a diffuse, thick, and viscous density interface, in contrast to the thin interface seen in the experiment. This viscous effect can be attributed to numerical diffusion, and a Lagrangian interface tracking procedure is shown to reduce the diffusion effect greatly.

Copyright © 1992 by The American Society of Mechanical Engineers
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