ANALYSIS OF THERMAL PERFORMANCE, EFFICIENCY, AND EFFECTIVENESS OF A STRAIGHT POROUS FIN WITH VARIABLE THERMAL CONDUCTIVITY

Radiating extended surfaces are generally used to reinforce heat transfer between a primary surface and its environment. Specifi cally, if great temperature contrasts are taken into account, variable thermal conductivity materially affects the performance of the system. Thus the present numerical study is concerned with the thermal performance of a straight porous fi n under the infl uence of temperature-dependent thermal conductivity, magnetic fi eld, and radiation. The heat transfer model, which includes the Darcy law for simulating fl ow with solid–fl uid interactions in a porous medium, the Rosseland approximation for heat transfer through radiation, the Maxwell equations for the magnetic fi eld effect, and linearly varying temperature-dependent thermal conductivity, results in a highly nonlinear ordinary differential equation solved with using the fi nite-difference scheme with suitable boundary conditions. The obtained solutions are interpreted physically by considering the impact of relevant nondimensional parameters on the thermal performance, effi ciency, and effectiveness of the system. It follows from the analysis that the temperature-dependent thermal conductivity improves these characteristics
   
Author:  Babitha ,  K. R. Madhura
Keywords:  straight porous fi n, temperature-dependent thermal conductivity, magnetic fi eld, fi nite-difference method, Rosseland approximation
Page:  392