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Fluid flow induced by helical microswimmers in bulk and near walls

Magnetic nano- and microswimmers provide a powerful platform to study driven colloidal systems in fluidic media and are relevant to futuristic medical technologies requiring precise yet minimally invasive motion control at small scales. Upon the action of a rotating magnetic field, the helical micro...

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Detalles Bibliográficos
Autores principales: Pal, Malay, Fouxon, Itzhak, Leshansky, Alexander M., Ghosh, Ambarish
Formato: Online Artículo Texto
Lenguaje:English
Publicado: 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7614617/
https://www.ncbi.nlm.nih.gov/pubmed/37275181
http://dx.doi.org/10.1103/PhysRevResearch.4.033069
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author Pal, Malay
Fouxon, Itzhak
Leshansky, Alexander M.
Ghosh, Ambarish
author_facet Pal, Malay
Fouxon, Itzhak
Leshansky, Alexander M.
Ghosh, Ambarish
author_sort Pal, Malay
collection PubMed
description Magnetic nano- and microswimmers provide a powerful platform to study driven colloidal systems in fluidic media and are relevant to futuristic medical technologies requiring precise yet minimally invasive motion control at small scales. Upon the action of a rotating magnetic field, the helical microswimmers rotate and translate, generating flow in the surrounding fluid. In this paper, we study the fluid flow induced by the rotating helices using a combination of experiments, numerical simulations, and theory. The microhelices are actuated either in a fluid bulk or in proximity to the bottom wall using typical microfluidic device setup. We conclude that the mean hydrodynamic flow due to the helix actuation can be closely approximated by a system of rotlets line distributed along the helical axis (i.e., representing the flow due to rotating cylinder) which gets modified close to a wall through appropriate contributions from image multipoles. As the mean flow can be obtained in closed form, this study can be further applied towards modeling of the dynamics in a swarm of driven microswimmers interacting hydrodynamically near a bounding surface.
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spelling pubmed-76146172023-06-04 Fluid flow induced by helical microswimmers in bulk and near walls Pal, Malay Fouxon, Itzhak Leshansky, Alexander M. Ghosh, Ambarish Phys Rev Res Article Magnetic nano- and microswimmers provide a powerful platform to study driven colloidal systems in fluidic media and are relevant to futuristic medical technologies requiring precise yet minimally invasive motion control at small scales. Upon the action of a rotating magnetic field, the helical microswimmers rotate and translate, generating flow in the surrounding fluid. In this paper, we study the fluid flow induced by the rotating helices using a combination of experiments, numerical simulations, and theory. The microhelices are actuated either in a fluid bulk or in proximity to the bottom wall using typical microfluidic device setup. We conclude that the mean hydrodynamic flow due to the helix actuation can be closely approximated by a system of rotlets line distributed along the helical axis (i.e., representing the flow due to rotating cylinder) which gets modified close to a wall through appropriate contributions from image multipoles. As the mean flow can be obtained in closed form, this study can be further applied towards modeling of the dynamics in a swarm of driven microswimmers interacting hydrodynamically near a bounding surface. 2022-07 2022-07-25 /pmc/articles/PMC7614617/ /pubmed/37275181 http://dx.doi.org/10.1103/PhysRevResearch.4.033069 Text en https://creativecommons.org/licenses/by/4.0/Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International (https://creativecommons.org/licenses/by/4.0/) license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.
spellingShingle Article
Pal, Malay
Fouxon, Itzhak
Leshansky, Alexander M.
Ghosh, Ambarish
Fluid flow induced by helical microswimmers in bulk and near walls
title Fluid flow induced by helical microswimmers in bulk and near walls
title_full Fluid flow induced by helical microswimmers in bulk and near walls
title_fullStr Fluid flow induced by helical microswimmers in bulk and near walls
title_full_unstemmed Fluid flow induced by helical microswimmers in bulk and near walls
title_short Fluid flow induced by helical microswimmers in bulk and near walls
title_sort fluid flow induced by helical microswimmers in bulk and near walls
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7614617/
https://www.ncbi.nlm.nih.gov/pubmed/37275181
http://dx.doi.org/10.1103/PhysRevResearch.4.033069
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