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Confinement enhances the diversity of microbial flow fields
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Jeanneret, Raphaël, Pushkin, Dmitri O. and Polin, Marco (2019) Confinement enhances the diversity of microbial flow fields. Physical Review Letters, 123 (24). 248102. doi:10.1103/PhysRevLett.123.248102 ISSN 0031-9007.
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Official URL: https://link.aps.org/doi/10.1103/PhysRevLett.123.2...
Abstract
Despite their importance in many biological, ecological, and physical processes, microorganismal fluid flows under tight confinement have not been investigated experimentally. Strong screening of Stokelets in this geometry suggests that the flow fields of different microorganisms should be universally dominated by the 2D source dipole from the swimmer’s finite-size body. Confinement therefore is poised to collapse differences across microorganisms, which are instead well established in bulk. We combine experiments and theoretical modeling to show that, in general, this is not correct. Our results demonstrate that potentially minute details like microswimmer spinning and the physical arrangement of the propulsion appendages have in fact a leading role in setting qualitative topological properties of the hydrodynamic flow fields of microswimmers under confinement. This is well captured by an effective 2D model, even under relatively weak confinement. These results imply that active confined hydrodynamics is much richer than in bulk and depends in a subtle manner on the size, shape, and propulsion mechanisms of the active components.
Item Type: | Journal Article | ||||||
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Subjects: | Q Science > QC Physics Q Science > QR Microbiology T Technology > TJ Mechanical engineering and machinery |
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics Faculty of Science, Engineering and Medicine > Medicine > Warwick Medical School |
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Library of Congress Subject Headings (LCSH): | Fluid mechanics, Microfluidics, Microorganisms -- Motility | ||||||
Journal or Publication Title: | Physical Review Letters | ||||||
Publisher: | American Physical Society | ||||||
ISSN: | 0031-9007 | ||||||
Official Date: | 13 December 2019 | ||||||
Dates: |
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Volume: | 123 | ||||||
Number: | 24 | ||||||
Article Number: | 248102 | ||||||
DOI: | 10.1103/PhysRevLett.123.248102 | ||||||
Status: | Peer Reviewed | ||||||
Publication Status: | Published | ||||||
Access rights to Published version: | Restricted or Subscription Access | ||||||
Copyright Holders: | © 2019 American Physical Society | ||||||
Date of first compliant deposit: | 13 January 2020 | ||||||
Date of first compliant Open Access: | 14 January 2020 | ||||||
RIOXX Funder/Project Grant: |
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Open Access Version: |
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