TITLE:
Second Law Analysis of Forced Convective Cooling in a Channel with a Heated Wall Mounted Obstacle
AUTHORS:
Z. Kheirandish, S. A. Gandjalikhan Nassab, M. Vakilian
KEYWORDS:
Conjugated Heat Transfer; Obstacle; Forced Convection Flow; Entropy Generation
JOURNAL NAME:
Journal of Electronics Cooling and Thermal Control,
Vol.3 No.3,
September
18,
2013
ABSTRACT: The present work details a numerical simulation of forced convective
laminar flow in a channel with a heated obstacle attached to one wall. The
second law analysis is employed to investigate the distribution of entropy
generation in the flow domain to demonstrate the rate of irreversibilities in
thermal system. The conjugate problem including the convection heat transfer in
the fluid flow and conduction one inside the obstacle is solved numerically to
obtain the velocity and temperature fields in both gas and solid phases. To
reach this goal, the set of governing equations including momentum and energy
equations for the gas phase and conduction equation for the obstacle are solved
by CFD technique to determine the hydrodynamic and thermal behaviors of the
fluid flow around the obstacle and the temperature distribution in the solid
element. An attempt is made to detail the local Nusselt number distribution and
mean Nusselt number and also the local entropy generation distribution for the
individual exposed obstacle faces. A good consistency is found between the
present numerical results with experiment.