抄録
The double diffusive convection at the freezing or melting in aqueous solution was numerically studied at the Prandtl number Pr=l3.4, the Lewis number Le=100, the buoyancy ratio N_0=0,l or 5 and the Rayleigh number Ra_0=l0^7. In the case of freezing, a thin boundary layer of concentration was formed near the surface of ice and the solute accumulated near the bottom of the vessel. In the case of melting, two thermal convections were formed at N_0=0, a multi-layered convection at N_0=1 and a concentration stratified layer with convection layers at N_0=5.
