MASS TRANSFER ACROSS AN INTERFACE BETWEEN LAYERS IN A DOUBLE DIFFUSIVE NATURAL CONVECTION
When a two-layer system which consists of a solvent (upper layer) and a solution (lower layer) is heated from a vertical side wall and cooled from the opposing side wall, convection starts in each layer. A Galerkin finite-element method was employed for the numerical analyses of this two-layer convection. Computations were carried out for the Prandtl number <I>Pr</I> = 6, the aspect ratio <I>A</I> = 4, the Rayleigh number <I>Ra</I> = 10<SUP>4</SUP>, the buoyancy ratio <I>N</I> = 2 to 10 and the Lewis number <I>Le</I> = 10 to 100. The concentration in the upper layer increased linearly with time through the transfer of the solute across the interface between the layers. In conclusion, the flux of a solute across the interface was independent of the concentration difference between the layers, but dependent on the diffusion coefficient.
- Journal of chemical engineering of Japan
Journal of chemical engineering of Japan 28(6), 745-749, 1995-12-01
The Society of Chemical Engineers, Japan