Volume 70, Number 4, May 2005
|Page(s)||446 - 451|
|Published online||13 April 2005|
Positive and negative entropy production in an ideal-gas expansion
Escuela de Ingeniería Química, Facultad de Ingeniería, Universidad de los Andes Mérida, Venezuela
Accepted: 23 March 2005
A theoretical thermodynamic analysis shows that an irreversible isothermal expansion of an ideal gas in a cylinder equipped with a piston may occur through trajectories involving a simultaneous positive and negative entropy production. Under these trajectories the operation is more efficient than a reversible expansion between the same initial and final states. This unexpected behavior may be explained as a consequence of an entropy coupling between the simultaneous positive and negative entropy production processes.
PACS: 05.70.Ce – Thermodynamic functions and equations of state / 05.70.Ln – Nonequilibrium and irreversible thermodynamics / 65.40.Gr – Entropy and other thermodynamical quantities
© EDP Sciences, 2005
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