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Flow-induced forces in sphere doublets

Published online by Cambridge University Press:  11 July 2008

J. J. DERKSEN
J. J. DERKSEN*
Affiliation:
Chemical & Materials Engineering Department, University of Alberta, Edmonton, Alberta, T6G 2G6Canadajos@ualberta.ca
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Abstract

Motivated by applications in solids formation and handling processes we numerically investigate the force and torque required for maintaining a fixed contact between two equally sized solid spheres immersed in fluid flow. The direct numerical procedure applied is based on solving the Navier–Stokes equations by means of the lattice-Boltzmann method, with no-slip conditions at the surfaces of the moving spheres. It is validated by means of the analytical results due to Nir & Acrivos (1973) for sphere doublets in creeping flow. Subsequently, doublets are released in turbulent flows. In these cases, the contact force and torque strongly fluctuate, with peak levels much higher than would follow from simple dimensional analysis. The force fluctuation levels have been quantified by a linear relation in the ratio of sphere radius over Kolmogorov length scale.

Type
Papers
Information
Journal of Fluid Mechanics , Volume 608 , 10 August 2008 , pp. 337 - 356
Copyright
Copyright © Cambridge University Press 2008

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