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We introduce a well-defined geometrical parameter, Λ, related to dynamically connected pore sizes in composite materials. Λ describes the effects of an internal boundary layer on a variety of processes including electrical surface conduction, high-frequency viscous damping of acoustic waves, and healing length effects in fourth sound. We argue that Λ is also related to the dc permeability to flow of a viscous fluid.
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Johnson et al. (1986) studied this question.
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