Implementation of SLW model in the radiative heat transfer problems with particles and high temperature gradients

Abstract

Purpose

The paper aims to test the spectral line-based weighted sum of gray gases (SLW) method in axisymmetric geometries with particles and high temperature gradients.

Design/methodology/approach

An SLW model is coupled with Trivic’s mean wavelength approach to estimate the radiative heat fluxes at the wall of an enclosure and to the base wall of the rocket exhaust, thereby subsequently studying the effect of concentration variation of the gases and particles in these cases. Radiative transfer equation is solved using modified discrete ordinates method. Anisotropic scattering is modeled using transport approximation.

Findings

Two cases considered show the importance of particle emission and scattering in the rocket plume base heating problems. In cases involving only gases, the concentration of H₂O tends to have more impact on the flux values than any other gas.

Originality/value

A full model of gases with particles in an axially varying temperature field is reported. Such cases are very common in practical applications. The present methodology gives more insight and a firm handle on the problem vis-a-vis other traditional techniques.

Citation

Yadav, R., Balaji, C. and Venkateshan, S.P. (2017), "Implementation of SLW model in the radiative heat transfer problems with particles and high temperature gradients", International Journal of Numerical Methods for Heat & Fluid Flow, Vol. 27 No. 5, pp. 1128-1141. https://doi.org/10.1108/HFF-03-2016-0095