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An Experimental Study of the Dynamics of Contact Lines

  • S. Kumar (a1), M. O. Robbins (a1) and D. H. Reich (a1)


We have studied the dynamics of contact lines formed by water-alkane interfaces in capillaries with random surface disorder. We find that the contact-line velocity V scales with the applied capillary pressure P as V∼ (PP t )ζ over two decades in V. This is consistent with a critical depinning transition. We obtain this result by using a sensitive ac differential-pressure measurement technique to measure dP/dV. We find that dP/dV αV −0 8 (5) implying that 1/ζ = 0. 20 (5).



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