RESEARCH PAPERS: Natural Convection

Direct Simulation of Double-Diffusive Layered Convection

[+] Author and Article Information
M. T. Hyun

Department of Mechanical Engineering, Cheju National University, Cheju-Do, 690-756 Korea

T. L. Bergman

Department of Mechanical Engineering, The University of Texas at Austin, Austin, TX 78712

J. Heat Transfer 117(2), 334-339 (May 01, 1995) (6 pages) doi:10.1115/1.2822526 History: Received March 01, 1994; Revised June 01, 1994; Online December 05, 2007


A two-layer, salt-stratified system destabilized and mixed by lateral heating and cooling is simulated numerically using a spectral methodology. As noted in previous studies, the mixing time is delayed as the stabilizing buoyancy ratio increases, and as the Rayleigh number decreases. Depending on the regime of operation, however, distinct physical mechanisms are responsible for interface erosion and system mixing. At low Ra, erosion is gradual with overlying (underlying) fluid sheared from the interface and mixed into the adjacent thermally convecting layer. At high Ra, an intermittent mechanism is predicted to occur with solutally distinct plumes bombarding the interface and ejecting fluid into the convecting layers. Predictions obtained with the spectral method are in relatively good agreement with experimental data.

Copyright © 1995 by The American Society of Mechanical Engineers
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