Diffusion and spatial correlations in suspensions of swimming particles

Populations of swimming micro-organisms produce fluid motions that lead to dramatically enhanced diffusion of tracer particles. Using simulations of suspensions of swimming particles in a periodic domain, we capture this effect and show that it depends qualitatively on the mode of swimming: swimmers...

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Bibliographic Details
Published in:Physical review letters 2008-06, Vol.100 (24), p.248101-248101, Article 248101
Main Authors: Underhill, Patrick T, Hernandez-Ortiz, Juan P, Graham, Michael D
Format: Article
Language:English
Subjects:
Flagella - physiology
Microfluidics
Models, Biological
Models, Theoretical
Phantoms, Imaging
Swimming
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Summary:Populations of swimming micro-organisms produce fluid motions that lead to dramatically enhanced diffusion of tracer particles. Using simulations of suspensions of swimming particles in a periodic domain, we capture this effect and show that it depends qualitatively on the mode of swimming: swimmers "pushed" from behind by their flagella show greater enhancement than swimmers that are "pulled" from the front. The difference is manifested by an increase, that only occurs for pushers, of the diffusivity of passive tracers and the velocity correlation length with the size of the periodic domain. A physical argument supported by a mean field theory sheds light on the origin of these effects.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.100.248101