Swimmer-tracer scattering at low Reynolds number
Understanding the stochastic dynamics of tracer particles in active fluids is important for identifying the physical properties of flow generating objects such as colloids, bacteria or algae. Here, we study both analytically and numerically the scattering of a tracer particle in different types of t...
| Main Authors: | , , , |
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| Format: | Journal article |
| Language: | English |
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2010
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| _version_ | 1797096793894289408 |
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| author | Dunkel, J Putz, V Zaid, I Yeomans, J |
| author_facet | Dunkel, J Putz, V Zaid, I Yeomans, J |
| author_sort | Dunkel, J |
| collection | OXFORD |
| description | Understanding the stochastic dynamics of tracer particles in active fluids is important for identifying the physical properties of flow generating objects such as colloids, bacteria or algae. Here, we study both analytically and numerically the scattering of a tracer particle in different types of time-dependent, hydrodynamic flow fields. Specifically, we compare the tracer motion induced by an externally driven colloid with the one generated by various self-motile, multi-sphere swimmers. Our results suggest that force-free swimmers generically induce loop-shaped tracer trajectories. The specific topological structure of these loops is determined by the hydrodynamic properties of the microswimmer. Quantitative estimates for typical experimental conditions imply that the loops survive on average even if Brownian motion effects are taken into account. © 2010 The Royal Society of Chemistry. |
| first_indexed | 2024-03-07T04:46:38Z |
| format | Journal article |
| id | oxford-uuid:d3865474-5521-4a9a-aaa4-21b9f39c47d5 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T04:46:38Z |
| publishDate | 2010 |
| record_format | dspace |
| spelling | oxford-uuid:d3865474-5521-4a9a-aaa4-21b9f39c47d52022-03-27T08:11:42ZSwimmer-tracer scattering at low Reynolds numberJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:d3865474-5521-4a9a-aaa4-21b9f39c47d5EnglishSymplectic Elements at Oxford2010Dunkel, JPutz, VZaid, IYeomans, JUnderstanding the stochastic dynamics of tracer particles in active fluids is important for identifying the physical properties of flow generating objects such as colloids, bacteria or algae. Here, we study both analytically and numerically the scattering of a tracer particle in different types of time-dependent, hydrodynamic flow fields. Specifically, we compare the tracer motion induced by an externally driven colloid with the one generated by various self-motile, multi-sphere swimmers. Our results suggest that force-free swimmers generically induce loop-shaped tracer trajectories. The specific topological structure of these loops is determined by the hydrodynamic properties of the microswimmer. Quantitative estimates for typical experimental conditions imply that the loops survive on average even if Brownian motion effects are taken into account. © 2010 The Royal Society of Chemistry. |
| spellingShingle | Dunkel, J Putz, V Zaid, I Yeomans, J Swimmer-tracer scattering at low Reynolds number |
| title | Swimmer-tracer scattering at low Reynolds number |
| title_full | Swimmer-tracer scattering at low Reynolds number |
| title_fullStr | Swimmer-tracer scattering at low Reynolds number |
| title_full_unstemmed | Swimmer-tracer scattering at low Reynolds number |
| title_short | Swimmer-tracer scattering at low Reynolds number |
| title_sort | swimmer tracer scattering at low reynolds number |
| work_keys_str_mv | AT dunkelj swimmertracerscatteringatlowreynoldsnumber AT putzv swimmertracerscatteringatlowreynoldsnumber AT zaidi swimmertracerscatteringatlowreynoldsnumber AT yeomansj swimmertracerscatteringatlowreynoldsnumber |