Abstract
The double diffusive natural convection at Freezing in aqueous solution was studied numerically. The dimensionless parameters for the calculation were the Prandtl number Pr=13, the Lewis number Le=100, the Rayleigh number Ra_0=10^6 and the buoyancy ratio N_0=1 or 10 at the salt water solidification, and Pr=13, Le=100, Ra_0=10^6 and N_0=-1 or -10 at alcohol solution solidification. At salt water solidification, salt fingers and salt-curtain were formed and developed with time. Then the solute accumulated effectually near the bottom. At alcohol solution solidification, many fingers occurred upwardly and the solute accumulated near the top surface of the enclosure. The finger pattern depends on the buoyancy ratio.
