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This assumption has been criticized (Refs. 7 and 12). Recently, this criticism has been addressed by showing that the Katz-Thompson assumption of circular geometry does not automatically preclude accurate predictions of permeability (Ref. 13), as the pore diameter appearing in the Washburn equation is only an effective tube diameter, which integrates over real pore shapes. Reference 13 showed that, at least for elliptical cross section tubes, the permeability of the circular tube with the mercury-defined effective diameter was almost identical with the true permeability of the original tube.

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Total CPU time used to obtain all results presented in this paper was about 80 h on a two processor Cray Research YMP computer, with 16 million words of core memory.

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