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A contact model for normal immersed collisions between a particle and a wall

Li, Xiaobai and Hunt, Melany L. and Colonius, Tim (2012) A contact model for normal immersed collisions between a particle and a wall. Journal of Fluid Mechanics, 691 . pp. 123-145. ISSN 0022-1120.

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The incompressible Navier–Stokes equations are solved numerically to predict the coupled motion of a falling particle and the surrounding fluid as the particle impacts and rebounds from a planar wall. The method is validated by comparing the numerical simulations of a settling sphere with experimental measurements of the sphere trajectory and the accompanying flow field. The normal collision process is then studied for a range of impact Stokes numbers. A contact model of the liquid–solid interaction and elastic effect is developed that incorporates the elasticity of the solids to permit the rebound trajectory to be simulated accurately. The contact model is applied when the particle is sufficiently close to the wall that it becomes difficult to resolve the thin lubrication layer. The model is calibrated with new measurements of the particle trajectories and reproduces the observed coefficient of restitution over a range of impact Stokes numbers from 1 to 1000.

Item Type:Article
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URLURL TypeDescription
Hunt, Melany L.0000-0001-5592-2334
Colonius, Tim0000-0003-0326-3909
Additional Information:© 2011 Cambridge University Press. Received 23 March 2011; revised 16 August 2011; accepted 16 October 2011; first published online 1 December 2011. The work was supported by NSF grant 0730284.
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Subject Keywords:particle/fluid flows, suspensions
Record Number:CaltechAUTHORS:20120224-125133227
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Official Citation:A contact model for normal immersed collisions between a particle and a wall preview Xiaobai Li, Melany L. Hunt and Tim Colonius Journal of Fluid Mechanics / Volume 691 / pp 123 - 145 Copyright © Cambridge University Press 2011 Published online: 01 December 2011 DOI:10.1017/jfm.2011.461
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:29461
Deposited By: Ruth Sustaita
Deposited On:24 Feb 2012 21:29
Last Modified:09 Mar 2020 13:18

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