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28 March 2024
 
  » pubmed » pmid12144444

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Nonuniversal velocity fluctuations of sedimenting particles
Shang-You Tee ; P J Mucha ; Luca Cipelletti ; S Manley ; M P Brenner ; P N Segre ; D A Weitz ;
Date 29 Jul 2002
Journal Phys Rev Lett, 89 (5), 054501
AbstractVelocity fluctuations in sedimentation are studied to investigate the origin of a hypothesized universal scale [P. N. Segre, E. Herbolzheimer, and P. M. Chaikin, Phys. Rev. Lett. 79, 2574 (1997)]. Our experiments show that fluctuations decay continuously in time for sufficiently thick cells, never reaching steady state. Simulations and scaling arguments suggest that the decay arises from increasing vertical stratification of particle concentration due to spreading of the sediment front. The results suggest that the velocity fluctuations in sedimentation depend sensitively on cell geometry.
Source PubMed, pmid12144444
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