A new ionic mass transfer correlation is derived for the fluid-saturated, horizontal porous layer. Darcy-Forchheimer model is used to explain characteristics of fluid motion. Based on the microscales of turbulence a backbone mass transfer relation is derived as a function of the Darcy-Rayleigh number, Ra D and the porous medium Schmidt number, Sc p . For the Darcy's limit of Sc p >>Ra D , the Sherwood number, Sh is a function of Ra D only. However, for the region of high Ra D , Sh can be

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... with Ra D Sc p . Based on the present backbone equation and the electrochemical mass transfer experiments which are electro plating or electroless plating, the new ionic mass transfer correlation is suggested in the porous media.