ABSTRACTNumerical and analytical solutions are developed for the distribution of a contaminant within an adsorbing porous medium in a unidirectional flow field subject to a step function for input concentration. The medium is considered to be homogeneous, isotropic, and areally finite. As a by‐product, solutions are also obtained for the case of a non‐absorbing porous medium. An example that demonstrates the applicability of the solutions is presen
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