Numerical Study on Depinning Dynamics of Fluids Interacting with Disorder |
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Authors: | CAO Yi-Gang and WK Chow |
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Institution: | Department of Building Services Engineering, The Hong Kong Polytechnic University, Hong Kong, China |
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Abstract: | We investigate the depinning of two-dimensional fluids interacting
with quenched disorder, based on Langevin simulations. For weak disorder
the fluids depin elastically and flow in an ordered state. A power-law
scaling fit between velocity and driving force can be obtained for the onset
of motion in the elastic regime. This is in good agreement with that of colloid,
charge density wave, and superconducting vortex systems. With an increasing
strength of the disorder, we find a sharp crossover to plastic depinning,
accompanied by a substantial increase in the depinning force. The
scaling fit obtained in the elastic regime becomes invalid when plastic flow
occurs. In the plastic regime, the fluids flow in channels and the hexatic order
decays exponentially with drives. |
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Keywords: | fluids elastic depinning plastic depinning |
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