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Article Dans Une Revue Physical Review Letters Année : 2022

The granular Brownian ratchet: carrying out a historical thought experiment

Résumé

We present an experimental realisation at macroscopic scale of the storied Brownian ratchet, which is an illustration of the Maxwell's demon. In our mechanism, the rotation of a centimetrescale 1D Brownian object in a granular gas is detected by an electromechanical converter (dynamo), generating a voltage proportional to its angular velocity. The current generated by this random rotation is rectified by an electronic device (demon), such that only positive current passes. Eventually, work is produced. The advantage of such a macroscopic setup is to allow measurement of all the observables per time unit: useful power (work), heat taken from the bath, and finally the efficiency of the equivalent heat engine. The feedback allowing the conversion from heat into work, expresses as a bias on the Brownian motion.
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Dates et versions

hal-03650213 , version 1 (24-04-2022)

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M Lagoin, C Crauste-Thibierge, Antoine Naert. The granular Brownian ratchet: carrying out a historical thought experiment. Physical Review Letters, 2022, 129 (120606), ⟨10.1103/PhysRevLett.129.120606⟩. ⟨hal-03650213⟩

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