Diffusion and double diffusive convection in the isothermal barium chloride-potassium chloride-water system at 25°C

The four diffusion coeffs. describing the isothermal interdiffusion transport in the three-component system BaCl2(1)-KCl(2)-H2O(3) at one concn. were measured. The conditions for the growth of convection inside the diffusion boundary (double diffusive convection) were computed according to the theory proposed by McDougall and compared with the exptl. results. Good agreement was found between theory and exptl. results. In this system, convection at the borders of the boundary grows even if the heavier components BaCl2 and KCl are more concd. at the bottom of the diffusion boundary.