Asymmetry-induced particle drift in a rotating flow


Bluemink, J.J. and Nierop, E.A. van and Luther, S. and Deen, N.G. and Magnaudet, J. and Prosperetti, A. and Lohse, D. (2005) Asymmetry-induced particle drift in a rotating flow. Physics of Fluids , 17 (7). 072106. ISSN 1070-6631

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Abstract:We report on an intriguing phenomenon taking place in a liquid rotating around a fixed horizontal axis. Under suitable conditions, bubbles and particles are observed to drift along the axis of rotation maintaining a constant distance from it and a constant angle of elevation above the horizontal. Absence of fore-aft symmetry of the bubble or particle shape is a prerequisite for this phenomenon. For bubbles, this requires a volume sufficiently large for surface-tension effects to be small and large deformations to be possible. Particle image velocimetry and flow visualization suggest that the wake does not play a role. The dependence on bubble radius, particle shape, liquid viscosity, and speed of rotation is investigated.
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Copyright:© 2005 American Institute of Physics
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