Settling statistics of hard sphere particles

Direct imaging of settling, non-Brownian, hard sphere, particles allows measurement of particle occupancy statistics as a function of time and sampling volume dimension. Initially random relative particle number fluctuations, / = 1, become suppressed, anisotropic, and dependent. Fitting to a simple...

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Bibliographic Details
Published in:Physical review letters 2001-04, Vol.86 (15), p.3300-3303
Main Authors: Lei, X, Ackerson, B J, Tong, P
Format: Article
Language:English
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Summary:Direct imaging of settling, non-Brownian, hard sphere, particles allows measurement of particle occupancy statistics as a function of time and sampling volume dimension. Initially random relative particle number fluctuations, / = 1, become suppressed, anisotropic, and dependent. Fitting to a simple Gaussian pair correlation model suggests a minute long ranged correlation leads to strong if not complete suppression of number fluctuations. Calflisch and Luke predict a divergence in velocity fluctuations with increasing sample volume size based on random (Poisson) statistics. Our results suggest this is not a valid assumption for settling particles.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.86.3300