The coupling between fluid and electric currents in random porous media leads to two reciprocal electrokinetic phenomena known as streaming potential and electro-osmosis. We report an experimental study of these coupling coefficients in rock and sintered glass bead samples. Using Onsager's reciprocal relation, we show that they rigorously determine the effective pore size for transport and hydraulic permeability of porous media.
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Li et al. (1995) studied this question.
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