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Non-equilibrium thermodynamics of turbulence-driven rotors
Physical Review Letters ( IF 9.227 ) Pub Date : 
N. Francois; H. Xia; H. Punzmann; M. Shats

We characterize a process of energy extraction via rectification of fully-developed turbulent flow by using tools of stochastic thermodynamics. We study the dynamics of an asymmetric autonomous rotor which shows biased direction of rotation when placed in a stream. We give experimental evidence that a Fluctuation Theorem can be used to describe the work injected in the rotor via its coupling with the turbulent flow structure. This approach allows to measure the mean power extracted from the chaotic fluid motion over a broad range of turbulent kinetic energy. A non-trivial dependence of the rotor power on flow kinetic energy is identified. This observation is described by a model taking into account the dissipation of the rotor energy and the temporal memory of coherent structures present in the turbulent flow.
更新日期:2020-05-22

 

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