C206 NUMERICAL COMPUTATION FOR OSCILLATORY DOUBLE DIFFUSIVE NATURAL CONVECTION OF LOW PRANDTL NUMBER FLUID IN A RECTANGULAR BOX(Double diffusion)

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The double diffusive natural convection in an enclosure with horizontal temperature and concentration gradients which give cooperating thermal and solutal buoyancies near the vertical walls was computed at the Prandtl number Pr=0.01, the Lewis number Le=100, the aspect ratio A=2, the Rayleigh number Ra=lO^4 or 10^6 and buoyancy ratioN=0, 3, 10 or 20. In the case of Rα=10^4, a large strong roll cell is formed at N=0 and 3 but the large strong cell at N=3 is rounder than that at N=0. At N=10 a strong roll cell is formed near the walls with secondary roll cells. At N=20 the concentration stratified layer is formed but the strong flow exists near the walls. In the case of Rα=10^6, clockwise or anti-clockwise roll cells coexist unsteadily at N=0. At N=3 a main large elliptical roll cell was formed with periodic rotation of secondary roll cells inside the main cell. At N=10 a main large roll cell was formed near the walls and several secondary roll cells were formed inside or outside the main cell.
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2000-10-01