| Stochastic resonance on the transverse displacement of swimmers in an oscillatory shear flow. | |
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MedLine Citation:
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PMID: 23031055 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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Self-propelled microorganisms, such as unicellular algae or bacteria, swim along their director relative to the fluid velocity. Under a steady shear flow the director rotates in close orbit, a periodic structure that is preserved under an oscillatory shear flow. If the shear flow is subjected to small fluctuations produced by small irregularities in the microchannel or by other swimmers nearby, the director dynamics becomes stochastic. Numerical integration of the swimmer motion shows that there is stochastic resonance: The displacement in the vorticity direction is maximized for a finite noise intensity. This transverse displacement resonance is observed when the displacement is coarse grained over several periods, although the director is preferentially oriented along the flow. The resonant noise intensity is proportional to the oscillation frequency and independent of the shear rate. The enhanced displacement can have effects on the transverse diffusion of swimmers and the rheology of the suspension. |
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Authors:
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Francisca Guzmán-Lastra; Rodrigo Soto |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2012-9-7 |
Journal Detail:
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Title: Physical review. E, Statistical, nonlinear, and soft matter physics Volume: 86 ISSN: 1550-2376 ISO Abbreviation: Phys Rev E Stat Nonlin Soft Matter Phys Publication Date: 2012 Sep |
Date Detail:
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Created Date: 2012-10-3 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 101136452 Medline TA: Phys Rev E Stat Nonlin Soft Matter Phys Country: - |
Other Details:
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Languages: ENG Pagination: 037301 Citation Subset: - |
Affiliation:
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Departamento de Física, FCFM, Universidad de Chile, Santiago, Chile. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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