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Directed motion of spheres induced by unbiased driving forces in viscous fluids beyond the Stokes' law regime

Jesús Casado-Pascual*

  • Física Teórica, Universidad de Sevilla, Apartado de Correos 1065, 41080 Sevilla, Spain

  • *jcasado@us.es
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Phys. Rev. E 97, 032219 – Published 30 March, 2018

DOI: https://doi.org/10.1103/PhysRevE.97.032219

Abstract

The emergence of directed motion is investigated in a system consisting of a sphere immersed in a viscous fluid and subjected to time-periodic forces of zero average. The directed motion arises from the combined action of a nonlinear drag force and the applied driving forces, in the absence of any periodic substrate potential. Necessary conditions for the existence of such directed motion are obtained and an analytical expression for the average terminal velocity is derived within the adiabatic approximation. Special attention is paid to the case of two mutually perpendicular forces with sinusoidal time dependence, one with twice the period of the other. It is shown that, although neither of these two forces induces directed motion when acting separately, when added together, the resultant force generates directed motion along the direction of the force with the shortest period. The dependence of the average terminal velocity on the system parameters is analyzed numerically and compared with that obtained using the adiabatic approximation. Among other results, it is found that, for appropriate parameter values, the direction of the average terminal velocity can be reversed by varying the forcing strength. Furthermore, certain aspects of the observed phenomenology are explained by means of symmetry arguments.

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Outline

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Phys. Rev. E 97, 032219– Published 30 March, 2018
  • Received 17 September 2017
  • Revised 27 February 2018
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