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SIGNIFICANCE OF ENTROPY GENERATION MINIMIZATION FOR A CONVECTIVE FLUID FLOW THROUGH POROUS MEDIA UNDER THE IMPOSED BOUNDARY CONDITIONS
Abstract
Achieving efficient energy systems has become a challenge for researchers, as many engineering applications combine convective heat transfer in fluid saturated porous media, such as nuclear reactors, hydrogen production and storage, underground disposal of waste, food processing and storage, solar power collectors or geothermal systems. For this purpose, it is essential to calculate energy losses and identify methods that involve minimal costs. The paper presents a problem of free convection for a fluid flow through porous media in a rectangular cavity with the upper wall hot, a variable temperature given at the left wall, the right adiabatic wall and a part of the lower wall being kept at a cool temperature. The governing equations of the mathematical model, given by conservation of mass, Darcy-s Law, energy and entropy generation, are transformed in terms of dimensionless variables, and the numerical results are obtained by using a finite difference method of second-order accuracy. The behavior of streamlines and isotherms on the fluid flow and heat transfer is investigated and discussed together with the effect of the main parameters, such as: Darcy number, chamber inclination angle from the horizontal, the thermal radiation parameter and Rayleigh number. The important tasks of the study mainly focus on the existence of irreversibility phenomena, affected by the model conditions and the values of the parameters in order to obtain minimum energy waste.
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