@Article{hmt.10.8,
AUTHOR = {Shantanu Dutta
, Arup Kumar Biswas},
TITLE = {ENTROPY GENERATION DUE TO NATURAL CONVECTION WITH  NON -UNIFORM HEATING OF POROUS QUADRANTAL ENCLOSURE-A  NUMERICAL STUDY},
JOURNAL = {Frontiers in Heat and Mass Transfer},
VOLUME = {10},
YEAR = {2018},
NUMBER = {1},
PAGES = {1--12},
URL = {http://www.techscience.com/fhmt/v10n1/53438},
ISSN = {2151-8629},
ABSTRACT = {Industrial processes optimization for higher energy efficiency may be effectively carried out based on the thermodynamic approach of entropy 
generation minimization (EGM). This approach provides the key insights on how the available energy (exergy) is being destroyed during the process 
and the ways to minimize its destruction. In this study, EGM approach is implemented for the analysis of optimal thermal mixing and temperature 
uniformity due to natural convection in quadrantal cavity filled with porous medium for the material processing applications or for cooling of electrical 
equipments. Effect of the permeability of the porous medium and the role of non-uniform heating in enhancing the thermal mixing, temperature effects 
and minimization of entropy generation is analyzed. The numerical solutions are obtained using finite element method. Stream lines , Isotherms and 
Entropy generation results are depicted for Ra=10<sup>6</sup>, 1.7x10<sup>5</sup>
, 10<sup>4</sup> and for Da=10<sup>-3</sup>, 10<sup>-4</sup> and 10<sup>-5</sup> at Pr=0.71.It is found that at lower Darcy number 
(Da), the thermal mixing is low and the heat transfer irreversibility dominates the total entropy generation. In contrast, thermal mixing is improved due 
to enhanced convection at higher Da. It is observed that fluid friction irreversibility dominates over heat transfer irreversibility for only Da=10<sup>-3</sup> at 
Ra=10<sup>6</sup>. The local entropy generation is maximum at the bottom wall, while at the center and top of the enclosure it becomes minimum. Based on EGM 
analysis, it is established that total entropy production is not significant with larger thermal mixing at high Darcy number, and can be recommended 
for material processing process or for cooling of electrical equipments.},
DOI = {10.5098/hmt.10.8}
}