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Pair-sphere trajectories in finite-Reynolds-number shear flow

Published online by Cambridge University Press:  17 January 2008

PANDURANG M. KULKARNI
Affiliation:
Benjamin Levich Institute and Department of Chemical Engineering, The City College of New York, New York, NY 10031, USA
JEFFREY F. MORRIS
Affiliation:
Benjamin Levich Institute and Department of Chemical Engineering, The City College of New York, New York, NY 10031, USA

Abstract

The pair trajectories of neutrally buoyant rigid spheres immersed in finite-inertia simple-shear flow are described. The trajectories are obtained using the lattice-Boltzmann method to solve the fluid motion, with Newtonian dynamics describing the sphere motions. The inertia is characterized by the shear-flow Reynolds number , where μ and ρ are the viscosity and density of the fluid respectively, is the shear rate and a is the radius of the larger of the pair of spheres in the case of unequal sizes; the majority of results presented are for pairs of equal radii. Reynolds numbers of 0 ≤ Re ≤ 1 are considered with a focus on inertia at Re = O(0.1). At finite inertia, the topology of the pair trajectories is altered from that predicted at Re = 0, as closed trajectories found in Stokes flow vanish and two new forms of trajectories are observed. These include spiralling and reversing trajectories in addition to largely undisturbed open trajectories. For Re = O(0.1), the limits of the various regions in pair space yielding open, reversing and spiralling trajectories are roughly defined.

Type
Papers
Copyright
Copyright © Cambridge University Press 2008

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