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Going in circles: Slender body analysis of a self-propelling bent rod

Arkava Ganguly and Ankur Gupta*

  • Department of Chemical and Biological Engineering, University of Colorado, Boulder, Colorado 80309, USA

  • *ankur.gupta@colorado.edu
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Phys. Rev. Fluids 8, 014103 – Published 20 January, 2023

DOI: https://doi.org/10.1103/PhysRevFluids.8.014103

Abstract

We study the two-dimensional motion of a self-propelling asymmetric bent rod. By employing slender body theory and the Lorentz reciprocal theorem, we determine particle trajectories for different geometric configurations and arbitrary surface activities. Our analysis reveals that all particle trajectories can be mathematically expressed through the equation for a circle. The rotational speed of the particle dictates the frequency of the circular motion and the ratio of translational and rotational speeds describes the radius of the circular trajectory. We find that even for uniform surface activity, geometric asymmetry is sufficient to induce a self-propelling motion. Specifically, for uniform surface activity, we observe (i) when bent rod arm lengths are equal, the particle only translates, (ii) when the length of one arm is approximately four times the length of the other arm and the angle between the arms is approximately π2, the rotational and translational speeds are at their maximum. We explain these trends by comparing the impact of geometry on the hydrodynamic resistance tensor and the active driving force. Overall, the results presented here quantify self-propulsion in composite-slender bodies and motivate future research into self-propulsion of highly asymmetric particles.

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Phys. Rev. Fluids 8, 014103– Published 20 January, 2023
  • Received 19 October 2022
  • Accepted 6 January 2023
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