Table of Contents
Journal of Thermodynamics
Volume 2013 (2013), Article ID 909162, 10 pages
http://dx.doi.org/10.1155/2013/909162
Research Article

Second Law Analysis of a Gas-Liquid Absorption Film

University of Gabes, Engineers National School, Chemical and Process Engineering Department, Applied Thermodynamics Unit, Omar Ibn El Khattab Street, 6029 Gabès, Tunisia

Received 17 November 2012; Accepted 28 January 2013

Academic Editor: Felix Sharipov

Copyright © 2013 Nejib Hidouri et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

This paper reports an analytical study of the second law in the case of gas absorption into a laminar falling viscous incompressible liquid film. Velocity, temperature, and concentration profiles are determined and used for the entropy generation calculation. Irreversibilities due to heat transfer, fluid friction, and coupling effects between heat and mass transfer are derived. The obtained results show that entropy generation is mainly due to coupling effects between heat and mass transfer near the gas-liquid interface. Total irreversibility is minimum at the diffusion film thickness. On approaching the liquid film thickness, entropy generation is mainly due to viscous irreversibility.