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  • Letter
  • Open Access

Enhanced buoyancy of active particles in convective flows

Yunyun Li1, Pulak K. Ghosh2, and Fabio Marchesoni1,3

  • 1Center for Phononics and Thermal Energy Science, Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology, School of Physics Science and Engineering, Tongji University, Shanghai 200092, China
  • 2Department of Chemistry, Presidency University, Kolkata 700073, India
  • 3Department of Physics, University of Camerino, I-62032 Camerino, Italy

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Phys. Rev. Research 3, L032065 – Published 14 September, 2021

DOI: https://doi.org/10.1103/PhysRevResearch.3.L032065

Abstract

We numerically investigated the diffusion of a heavy active Brownian particle in a linear periodic array of steady planar counter-rotating convection rolls at high Péclet numbers. We show that, under certain conditions, the particle rises to the surface even if it is denser than the suspension fluid, and floats there for exceedingly long times. Such an apparently counterintuitive phenomenon of “enhanced buoyancy” is a combined effect of gravity, advection, and shear torque.

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Phys. Rev. Research 3, L032065– Published 14 September, 2021
  • Received 13 July 2021
  • Accepted 3 September 2021
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

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