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Hydrodynamic efficiency limit on a Marangoni surfer [Elektronski vir]Daddi-Moussa-Ider, Abdallah ; Golestanian, Ramin ; Vilfan, Andrej, 1971-A Marangoni surfer is an object embedded in a gas–liquid interface, propelled by gradients in surface tension. We derive an analytical theorem for the lower bound on the viscous dissipation by a ... Marangoni surfer in the limit of small Reynolds and capillary numbers. The minimum dissipation can be expressed with the reciprocal difference between drag coefficients of two passive bodies of the same shape as the Marangoni surfer, one in a force-free interface and the other in an interface with surface incompressibility. The distribution of surface tension that gives the optimal propulsion is given by the surface tension of the solution for the incompressible surface and the flow is a superposition of both solutions. For a surfer taking the form of a thin circular disk, the minimum dissipation is 16μaV2, giving a Lighthill efficiency of 1/3. This places the Marangoni surfers among the hydrodynamically most efficient microswimmers.Source: Journal of Fluid Mechanics [Elektronski vir]. - ISSN 1469-7645 (Vol. 986, article no. A32, 10 May 2024, str. A32-1-A32-22)Type of material - e-article ; adult, seriousPublish date - 2024Language - englishCOBISS.SI-ID - 195203587
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Daddi-Moussa-Ider, Abdallah | ![]() |
Golestanian, Ramin | ![]() |
Vilfan, Andrej, 1971- | 21609 |
Source: Personal bibliographies
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