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Interaction and collisions between particles in a linear shear flow near a wall at low Reynolds number

Published online by Cambridge University Press:  11 May 2006

PIETRO POESIO
Affiliation:
J.M. Burgers Center, Delft University of Technology, Laboratory for Aero- and Hydrodynamics, Leeghwaterstraat 21, 2628 CA Delft, The Netherlands
GIJS OOMS
Affiliation:
J.M. Burgers Center, Delft University of Technology, Laboratory for Aero- and Hydrodynamics, Leeghwaterstraat 21, 2628 CA Delft, The Netherlands
ANDREAS TEN CATE
Affiliation:
Chemical Engineering Department, Engineering Quadrangle, Princeton University, Princeton, NJ, USA
JULIAN C. R. HUNT
Affiliation:
J.M. Burgers Center, Delft University of Technology, Laboratory for Aero- and Hydrodynamics, Leeghwaterstraat 21, 2628 CA Delft, The Netherlands Department of Space and Climate Physics, University College London, Gower Street, London WC1E 6BT, UK

Abstract

The flow field around pairs of small particles moving and rotating in a shear flow close to a wall at low but finite Reynolds number (Re) is computed as a function of time by means of the lattice-Boltzmann technique. The total force and torque acting on each particle is computed at each time step and the position of the particles is updated. By considering the lift force and the disturbances induced by the particles, the trajectories of the pair of particles are explained as a function of the distances from the wall and the Reynolds number. It is shown that when particles are positioned in a particular form, they collide forming strings. In particular, we are interested in particle-bridge formation in shear flows, and two collided particles (a string) can be considered as a nucleus of a particle bridge.

Type
Papers
Copyright
© 2006 Cambridge University Press

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