Velocity fluctuations in a low-Reynolds-number fluidized bed

by: Shang-You Tee, PJ Mucha, MP Brenner, DA Weitz

Journal of Fluid Mechanics, Vol. 596, No. -1. (2008), pp. 467-475.

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Cambridge University Press

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Abstract

The velocity fluctuations of particles in a low-Reynolds-number fluidized bed have important similarities and differences with the velocity fluctuations in a low-Reynolds-number sedimenting suspension. We show that, like sedimentation, the velocity fluctuations in a fluidized bed are described well by the balance between density fluctuations due to Poisson statistics and Stokes drag. However, unlike sedimentation, the correlation length of the fluctuations in a fluidized bed increases with volume fraction. We argue that this difference arises because the relaxation time of density fluctuations is completely different in the two systems.

@article{citeulike:2683168, abstract = {The velocity fluctuations of particles in a low-Reynolds-number fluidized bed have important similarities and differences with the velocity fluctuations in a low-Reynolds-number sedimenting suspension. We show that, like sedimentation, the velocity fluctuations in a fluidized bed are described well by the balance between density fluctuations due to Poisson statistics and Stokes drag. However, unlike sedimentation, the correlation length of the fluctuations in a fluidized bed increases with volume fraction. We argue that this difference arises because the relaxation time of density fluctuations is completely different in the two systems.}, author = {Tee, Shang-You and Mucha, P. J. and Brenner, M. P. and Weitz, D. A. }, citeulike-article-id = {2683168}, journal = {Journal of Fluid Mechanics}, keywords = {flow, grain}, number = {-1}, pages = {467--475}, posted-at = {2008-04-17 19:55:54}, priority = {2}, title = {Velocity fluctuations in a low-Reynolds-number fluidized bed}, url = {http://journals.cambridge.org/action/displayAbstract?fromPage=online\&aid=1658388}, volume = {596}, year = {2008} }

RIS record

TY - JOUR ID - citeulike:2683168 L3 - citeulike-article-id:2683168 TI - Velocity fluctuations in a low-Reynolds-number fluidized bed JF - Journal of Fluid Mechanics VL - 596 IS - -1 SP - 467 EP - 475 N2 - The velocity fluctuations of particles in a low-Reynolds-number fluidized bed have important similarities and differences with the velocity fluctuations in a low-Reynolds-number sedimenting suspension. We show that, like sedimentation, the velocity fluctuations in a fluidized bed are described well by the balance between density fluctuations due to Poisson statistics and Stokes drag. However, unlike sedimentation, the correlation length of the fluctuations in a fluidized bed increases with volume fraction. We argue that this difference arises because the relaxation time of density fluctuations is completely different in the two systems. KW - flow KW - grain AU - Tee, Shang-You AU - Mucha, PJ AU - Brenner, MP AU - Weitz, DA PY - 2008//17/ UR - http://journals.cambridge.org/action/displayAbstract?fromPage=online&aid=1658388 ER -

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