Positive and negative entropy production in an ideal-gas expansionJ. I. Belandria
Escuela de Ingeniería Química, Facultad de Ingeniería, Universidad de los Andes Mérida, Venezuela
received 22 September 2004; accepted in final form 23 March 2005
published online 13 April 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.
05.70.Ce - Thermodynamic functions and equations of state.
05.70.Ln - Nonequilibrium and irreversible thermodynamics.
65.40.Gr - Entropy and other thermodynamical quantities.
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