RESEARCH PAPERS: Natural and Mixed Convection

A Two-Fluid Model of Mixing in a Two-Dimensional Enclosure

[+] Author and Article Information
O. J. Ilegbusi, M. D. Mat

Department of Mechanical, Industrial and Manufacturing Engineering, 360 Huntington Avenue, 334 SN, Northeastern University, Boston, MA 02115

J. Heat Transfer 120(1), 115-126 (Feb 01, 1998) (12 pages) doi:10.1115/1.2830034 History: Received February 24, 1997; Revised September 30, 1997; Online January 07, 2008


Mixing of fluids in a cavity under isothermal and nonisothermal conditions is studied with a two-fluid model. This model involves the solution of separate transport equations for zone-averaged variables of each fluid with allowance for interface transport of momentum and energy. The effects of thermal and potential energy driven convection as well as Prandtl number are investigated. The material interface is represented by the contour of the volume fraction separating the fluids. The effect of the buoyancy force due to the initial potential energy of the fluids is found to predominate over thermal buoyancy for comparable Grashof numbers.

Copyright © 1998 by The American Society of Mechanical Engineers
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