Fluid-particle interaction force for polydisperse systems from lattice boltzmann simulations

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Sarkar, S. and Hoef van der, M.A. and Kuipers, J.A.M. (2008) Fluid-particle interaction force for polydisperse systems from lattice boltzmann simulations. In: 6th International Conference on Computational Fluid Dynamics in the Oil & Gas, Metallurgical and Process Industries, CFD 2008, 10-12 June 2008, Trondheim, Norway.

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Abstract:Gas-solid fluidized beds are almost always polydisperse in industrial
application. However, to describe the fluid-particle interaction
force in models for large-scale gas-solid flow, relations
are used which have been derived for monodisperse system, for
which ad-hoc modifications are made to account for polydispersity.
Recently it was shown, on the basis of detailed lattice
Boltzmann simulations, that for bidisperse systems these
modifications predict a drag force which can be factors different
from the true drag force. In this work fluid-particle interaction
forces for polydisperse system are studied by means of
lattice Boltzmann simulation, using a grid that is typically an
order of magnitude smaller than the sphere diameter. Two different
lognormal size distributions are considered for this study.
The systems consist of polydisperse random arrays of spheres
in the diameter range of 8-24 grid spacing and 8-40 grid spacing,
a solid volume fraction of 0.5 and 0.3 and Reynolds number
0.1 to 500. The data confirms the observations made for bidisperse
systems, namely that an extra correction factor for the
drag force is required to adequately capture the effect of polydispersity.
It was found that the correction factor derived by van
der Hoef et al (J. Fluid Mech. 528 (2005) 233) on the basis of
bidisperse simulation data, applies also to general polydisperse
systems
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Link to this item:http://purl.utwente.nl/publications/68587
Organisation URL:http://www.sintef.no/Projectweb/CFD2008
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