Numerical Computation For The Transient Formation Process Of Double Diffusive Natural Convection Of High And Low Prandtl Number Fluids

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