Wed, 20 Aug 2008 22:04:47 BST CiteULike: dchen Mucha http://www.citeulike.org/user/dchen/author/Mucha CiteULike.org en-gb Copyright © 2004-2008 citeulike.org http://www.citeulike.org/user/dchen/article/2713643 <i>Journal of Fluid Mechanics, Vol. 501, No. -1. (2004), pp. 71-104.</i> A model for velocity fluctuations in sedimentation Peter Mucha Shang-You Tee David Weitz Boris Shraiman Michael Brenner Journal of Fluid Mechanics, Vol. 501, No. -1. (2004), pp. 71-104. 2008-04-24T18:08:14-00:00 2004 Journal of Fluid Mechanics 501 -1 71 104 flow gravity weitz http://www.citeulike.org/user/dchen/article/2683168 <i>Journal of Fluid Mechanics, Vol. 596, No. -1. (2008), pp. 467-475.</i><br /><br />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. Velocity fluctuations in a low-Reynolds-number fluidized bed Shang-You Tee PJ Mucha MP Brenner DA Weitz Journal of Fluid Mechanics, Vol. 596, No. -1. (2008), pp. 467-475. 2008-04-17T18:54:33-00:00 2008 Journal of Fluid Mechanics 596 -1 467 475 flow grain