Abstract
The authors study the influence of activity on particles advected by convection rolls and observe that they float on the surface, even if they are denser than the suspension fluid.
Highlights
All sorts of counterintuitive phenomena are known to occur in mechanical systems maintained out of equilibrium [1]
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
In this Letter we investigate a less contrived realization of negative response to an external bias, namely the floating properties of a pointlike heavy active Brownian particle periodically advected in a linear array of convection rolls [12]
Summary
All sorts of counterintuitive phenomena are known to occur in mechanical systems maintained out of equilibrium [1]. Among the best known examples are the inverted (Stephenson-Kapitza and Chelomei) pendulums, namely rigid rods designed to oscillate upside down by vertically shaking their suspension points [2]. Vibrational forces may lead to intriguing effects, like the sinking of gas bubbles in shaken liquids [3]. Levitation of a fluid layer above air is another surprising example [4], whereby relatively heavy objects can float upside down on the layer’s lower interface, as if gravity were inverted [3]. Segregation of granular materials by size is due to the interplay of external (gravitational and vibrational) and internal (particleparticle and particle-wall) forces and depends on the particle shapes [6]
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