Fluid Elasticity Can Enable Propulsion at Low Reynolds Number

Details Fluid Elasticity Can Enable Propulsion at Low Reynolds Number Fluid Elasticity Can Enable Propulsion at Low Reynolds Number

2012-01-02

arxiv.org/abs/1201.0545v2

Physics

Fluid Dynamics

5 pages, 4 figures

Scientific paper

Conventionally, a microscopic particle that performs a reciprocal stroke cannot move through its environment. This is because at small scales, the response of simple Newtonian fluids is purely viscous and flows are time-reversible. We show that by contrast, fluid elasticity enables propulsion by reciprocal forcing that is otherwise impossible. We present experiments on rigid objects actuated reciprocally in viscous fluids, demonstrating for the first time a purely elastic propulsion set by the object's shape and boundary conditions. We describe two different artificial "swimmers" that experimentally realize this principle.

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