Publikation: Negative Drag Force on Beating Flagellar-Shaped Bodies in Active Fluids
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European Union (EU): 101141477
Deutsche Forschungsgemeinschaft (DFG): 404840447
Deutsche Forschungsgemeinschaft (DFG): 2117 - 422037984
Deutsche Forschungsgemeinschaft (DFG): 404840447
Deutsche Forschungsgemeinschaft (DFG): 2117 - 422037984
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Physical Review Letters. American Physical Society (APS). 2025, 135(11), 118301. ISSN 0031-9007. eISSN 1079-7114. Verfügbar unter: doi: 10.1103/3xbk-sxhh
Zusammenfassung
We experimentally investigate the drag force exerted by a suspension of light-induced active particles (APs) on a translating and beating idealized flagellum-shaped object realized through negative phototactic interactions with the APs. We observe both positive and negative drag forces, depending on the beating frequency and translational velocity, driven by the dynamic redistribution of APs in response to the object’s motion. These findings are supported by numerical simulations and an analytical model, extendable to a range of slender geometries. Our results illustrate the complex interplay between geometric body changes and the density distribution in active baths, which may also be relevant for microrobotic applications.
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KNIPPENBERG, Timo, Robin BEBON, Thomas SPECK, Clemens BECHINGER, 2025. Negative Drag Force on Beating Flagellar-Shaped Bodies in Active Fluids. In: Physical Review Letters. American Physical Society (APS). 2025, 135(11), 118301. ISSN 0031-9007. eISSN 1079-7114. Verfügbar unter: doi: 10.1103/3xbk-sxhhBibTex
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title={Negative Drag Force on Beating Flagellar-Shaped Bodies in Active Fluids},
year={2025},
doi={10.1103/3xbk-sxhh},
number={11},
volume={135},
issn={0031-9007},
journal={Physical Review Letters},
author={Knippenberg, Timo and Bebon, Robin and Speck, Thomas and Bechinger, Clemens},
note={Article Number: 118301}
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