Heat transfer and entropy generation study of non-Darcy double-diffusive natural convection in inclined porous enclosures with different source configurations

摘要

In the present study, steady double-diffusive natural convection of two-phase flow through a square enclosure filled with a fluid-saturated porous medium, in presence of the internal thermal and solutal source is investigated numerically. Darcy-Brinkman-Forchheimer model is used to describe the fluid flow in porous media. This research aims to obtain a deep understanding about details of physical processes involved in such flows, using both the first and the second law analysis for different internal source(s) configurations. To this end, an in-house finite volume numerical solver is developed and validated against available data in literatures. Results are presented in terms of streamlines, isotherms and concentration contours for different values of Darcy, Rayleigh and Lewis numbers. First the effect of inclination angle of the cavity on heat and mass transfer characteristics of flows is investigated in presence of an internal source with the square and rectangular shape. Next, twelve different internal source configurations with distinctive shapes, locations and arrangements are studied and their effects on Nusselt and Sherwood numbers are investigated. Finally an entropy generation analysis is conducted to identify the best internal source configuration from the viewpoint of the second law of thermodynamics. (C) 2016 Elsevier Ltd. All rights reserved.