Oscillating Electromagnetic Force Effect on Concentration Distribution near Liquid Solid Interface

Abstract

Mass transfer near the reaction interface is often rate determining step in a high temperature process. Traditional agitation method reduces concentration boundary layer formed near the reaction interface from its outside by increasing the velocity in the bulk region. On the other hand, agitation in the concentration boundary layer is another way for intensification of the chemical reaction rate. For this purpose, excitation of flow in the concentration boundary layer is essential. Thus, effect of the static magnetic field on the solute concentration distribution near an electrode under the AC current imposition has been experimentally examined in this study. In the experiment, brightness near the interface between the copper electrode with the triangle shape and the mixed solution of 0.5mol/L CuSO4 aqueous solution with 0.1mol/L H2SO4 aqueous solution was measured under the imposition of the AC electrical current of 4Vp-p and 0.5Hz. And the aqueous solution motion was estimated using polystyrene particles. As the results, the concentration boundary layer thickness decreased and the AC current concentrated around the top of the lower electrode by imposing the static magnetic field.