Feynman's ratchet and pawl: an exactly solvable model.
We introduce a simple, discrete model of Feynman's ratchet and pawl, operating between two heat reservoirs. We solve exactly for the steady-state directed motion and heat flows produced, first in the absence and then in the presence of an external load. We show that the model can act both as a heat engine and as a refrigerator. We finally investigate the behavior of the system near equilibrium, and use our model to confirm general predictions based on linear-response theory.
Jarzynski
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Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA. chrisj@lanl.gov
Mazonka
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