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Article Dans Une Revue Physics of Fluids Année : 2009

Sedimentation of a sphere in a fluid channel

Résumé

We studied both experimentally and numerically the sedimentation velocity of small solid particles through liquid channels merging at the intersection of three soap films. The wall mobility induces a nontrivial behavior for the particle drag coefficient, providing particular transport properties that are not observed for channels with rigid walls. It is shown that for sufficiently small particles, slow and fast motions are observed for the particle along the channel, depending on the particle position within the channel cross section and the sphere/channel size ratio. The velocity corresponding to fast motions can be as high as twice the Stokes velocity in an unbounded fluid. Moreover, the fast motions are not observed anymore when the size ratio exceeds a critical value, which has been found to be approximately equal to 0.5. As another major difference with the solid wall channel, the sphere velocity does not vanish when the size ratio reaches unity. Instead, the smallest value is found to be 1/4 of the Stokes velocity.
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Dates et versions

hal-00507437 , version 1 (10-09-2015)

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Olivier Pitois, Ch. Fritz, L. Pasol, M. Vignes-Adler. Sedimentation of a sphere in a fluid channel. Physics of Fluids, 2009, 21, pp.103304. ⟨10.1063/1.3253408⟩. ⟨hal-00507437⟩
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