Transient thermal characteristics of porous radiant burners

The transient heat transfer characteristics of porous radiant burners are analyzed in this work. A one dimensional model is used to solve the governing equations for porous medium and gas flow before the premixed flame to the exhaust gas. Combustion in the porous medium is modeled as a spatially dependent heat generation zone. The solid phase is assumed to be absorbing, emitting and scattering, while the gas phase is considered transparent to radiation. In order to analyze the thermal characteristics of porous burners, the coupled energy equations for the gas and porous medium based on the two-flux radiation model are solved numerically and the effect of various factors on the performance of porous radiant burners are determined. A comparison has been made between the present numerical results and those reported by other investigators to validate the simplification for the radiative effect