Journal
PHYSICS OF FLUIDS
Volume 12, Issue 6, Pages 1619-1621Publisher
AMER INST PHYSICS
DOI: 10.1063/1.870412
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The evolution of velocity fluctuations in a stably stratified suspension settling under the influence of gravity is studied. Based on a continuum model for sedimentation dynamics, decay of long-wave fluctuations in the particle density is found. Substantial reduction in velocity fluctuations is an important consequence. Specifically, the evolution of the particle density in a stably stratified suspension immediately leads to particle distributions, where the variance in the velocity is bounded as the container size grows to infinity. This result is a possible explanation for why velocity fluctuations have been observed to depend on container size in numerical simulations but generally not in physical experiments. (C) 2000 American Institute of Physics. [S1070-6631(00)03006-3].
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