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A dynamic Wicke-Kallenbach method to obtain effective diffusivities is presented. The method is carried out by performing curve-fitting between measured breakthrough curves and calculated ones obtained numerically by use of the Fourier inverse transform technique. The major advantage of this transient method is that it is possible to determine effective diffusivities within a short measuring time. The method is illustrated with experimental data for heavy water diffusing through activated carbon pellets. The values of effective diffusivity obtained for heavy water are reasonable ones and are in good agreement with those obtained previously using the breakthrough method.

Effective diffusivities of heavy water in activated carbon pellets by transient measurements using the wicke-kallenbach apparatus.