Entropy balance for nonequilibrium steady states
Abstract
The concept of entropy is examined for a finite-size nonequilibrium thermodynamic system representative of a confined fluid dynamic system. It is shown that the boundary conditions for the case of rigid boundaries represent a coupling with the outside. An energy equation expressing locally reversible energy transfer to the outside in terms of the Carnot rule is derived. The global entropy balance is illustrated for the case of a homogeneous cylinder rotating about its axis and interacting with black-body radiation impinging upon it along a direction perpendicular to the rotation axis, and it is shown that in the case of work delivered to the outside, a dynamic balance of two entropy fluxes is present, while in the absence of external work, the outgoing entropy flux is larger than the entropy received although the total body entropy is constant. The results have direct implications for global climatology.
- Publication:
-
Nuovo Cimento B Serie
- Pub Date:
- August 1981
- DOI:
- 10.1007/BF02903287
- Bibcode:
- 1981NCimB..64..252F
- Keywords:
-
- Entropy;
- Fluid Dynamics;
- Irreversible Processes;
- Nonequilibrium Thermodynamics;
- Steady State;
- Black Body Radiation;
- Carnot Cycle;
- Climatology;
- Energy Transfer;
- Thermodynamics and Statistical Physics