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

Physical Review. E
Jesús Casado-Pascual

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 a...Continue Reading

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Citations

Jun 4, 2019·Chaos·Jesús Casado-PascualNiurka R Quintero
Aug 21, 2021·Physical Review. E·Ricardo Chacón, Pedro J Martínez

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