Mass transfer terms in porous layers and particles

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Mobile phase mass transfer terms are derived or rederived for various geometries of porous material in which the mobile phase is stagnant. The results are tabulated and compared with those of other workers in Table I. A new, simpler and more rigorous equation is given for plate height in a porous layer open tubular column. Stationary phase mass transfer terms are increased by a factor, f, when the stationary phase must be reached through stagnant fluid. In these circumstances the mobile phase mass transfer term for the moving stream of mobile phase is also changed so that where the relative sample velocity R occurs in such terms it must be replaced by φ R or, equivalently, the column capacity ratio k must be replaced by G olay's “virtual k”, k v given by k v = (1 + k−φ)/φ.