Onsager coefficients of a Brownian Carnot cycle |
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Authors: | Y Izumida and K Okuda |
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Institution: | 1.Department of Physics,Hokkaido University,Sapporo,Japan |
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Abstract: | We study a Brownian Carnot cycle introduced by Schmiedl
and Seifert Europhys. Lett. 81, 20003 (2008)]
from a viewpoint of the linear irreversible thermodynamics.
By considering the entropy production rate of this cycle,
we can determine thermodynamic forces and fluxes of the cycle and calculate
the Onsager coefficients
for general protocols, that is, arbitrary schedules
to change the potential confining the Brownian particle.
We show that these Onsager coefficients contain the information of the
protocol shape and they satisfy the tight-coupling
condition irrespective of whatever protocol shape
we choose. These properties may give an explanation why the
Curzon-Ahlborn efficiency often appears in the finite-time heat engines. |
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Keywords: | |
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