Parametric study of radiative heat transfer in participating gas–solid flows

Abstract

Generally, before building a radiative model for a particular gas–solid flow, one has to determine whether the influence of particle scattering and gas radiation are significant. This paper gives the results of parametric studies on the influence of scattering and gas radiation for various gas–solid slabs at high temperature. A statistical Monte-Carlo method has been used in order to solve the radiative transfers into an emitting, absorbing and anisotropically scattering one-dimensional medium. These slabs are constituted of H 2O and CO 2 gases with a monodispersion of spherical particles. In a first step, Planck means of particle radiative properties of absorption and scattering have been studied at high temperature versus the diameter ( 10 −7 < D < 2.10 −4 m ) and the complex refractive index ( n = 1.7 or 2.5 and 10 −4 < k < 20 ). Then, fluxes emitted by numerous slabs have been computed and compared to emphasize the role of gases and particles. These fluxes are emitted by slabs with different thicknesses ( e = 0.1 m or 1 m), volume fraction ( 10 −7 < f v < 10 −3 ) and refractive index. In addition, particular attention is devoted to the use of the presented sensitivity results. An approach is then derived which permits to extend these results to other situations than those considered in this paper. Finally, the influence of the gas mixture and scattering on spectral emission is studied spectrally.