Dynamics of a harmonically driven fluid interface in a capillary
نویسندگان
چکیده
We use an harmonic technique to probe the dynamics of a liquid-liquid interface in a capillary. The capillary pressure drop induced by a harmonic displacement of the fluids is recorded as a function of the excitation amplitude and frequency. At low frequency there is an amplitude threshold above which the contact line depins and slides, and this threshold is related to the static hysteresis of the contact angle. When the contact line depins, the damping due to its motion is measured from the component of the capillary pressure in phase with the fluids velocity. At frequencies higher than one hertz we observe a phenomenon of dynamic pinning. The behaviour of
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