Transient characteristics of combined conduction, convection and radiation heat transfer in porous media

Combined radiation and convection heat transfer in a porous channel bounded by isothermal parallel plates

“…In all these analyses, the medium considered is a general fluid continuum. In some investigations [2][3][4][5], combined conduction, convection and radiation heat transfer problems in porous media have been analysed with known uniform velocity across the medium. When the porosity and permeability of the porous medium are relatively high, boundary and inertia effects come into play, and in this situation, the assumption of uniform velocity across the medium is not valid [17].…”

“…However, none of the previous studies took into account the effect of convection and radiation for a general medium with PMSP c, and therefore results for the variations of the Nusselt number Nu, heat flux and temperature are not available for various values of the PMSP c. The present work was aimed at extending the work of Chawla and Chan [12] by incorporating a general medium with PMSP c, and that of Kaviany [17] by considering the effect of radiation. The present work thus bears significance in providing more accurate predictions especially in the area of porous medium combustion where the analysis is done either by considering fluid and solid phases as a single continuum [9] or separate continua [1][2][3][4][5][6][7][8]. In all these Nomenclature C p specific heat at constant pressure…”

“…In recent years, in high-temperature applications, a great deal of attention has been focused on the usage of porous media [1][2][3][4][5][6][7][8][9]. Apart from many other applications, porous media have been utilized for enhancement of heat transfer in coolant passages [10,11] and in thermal insulation systems [1,5].…”

Numerical simulation of porous radiant burners under transient condition

“…P 3 The ratio of convection between two phases to solid radiation, hAL x =T 3 g0 P 4 The ratio of combustion heat to solid radiation, L x _ Q=T 4 g0 P 5 The ratio of solid conduction to solid radiation, k p =T 3 g0 L x P 6 The ratio of gas convection to gas conduction at boundaries, h wg L x =k p P 7 The …”

“…In the last decades, many numerical studies and experimental investigations have been done on the combustion of porous media [1][2][3][4][5][6]. In order to optimize the combustion process, Brenner et al [7] studied a 2-D pseudo homogeneous porous burner in 2000.…”