Author(s)

K. Kamakura & H. Ozoe

Abstract

Numerical computation for the transient formation process of double diffusive natural convection of high and low Prandtl number fluids K. Kamakura" & H. Ozoe& "Toyama National College of Technology, 13 Hongo-machi, Toyama 939, Japan ^Institute of Advanced Material Study, Kyushu University, 6-1 Kasuga Koen, Kasuga 816, Japan ABSTRACT The numerical computations of double diffusive natural convection by lateral heating and cooling were carried out for the system with a linear concentration gradient. Computations with a Galerkin finite element method were done for the Prandtl number Pr=0.01 or 6, the Rayleigh numbers Ra=W*, l(f or 10^. the Lewis number Le=100, the aspect ratio A=4, the buoyancy ratio #=10. At Pr=6 and Ra-l(^ the stable multi-layered convection was formed. At Pr=0.01 and Ra=W* or 10^ the whole system with a linear concentration gradient started to roll with the lateral heating and cooling. Then two round roll cells with convection appeared near the top and

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