Heat and Mass Transfer in MHD Channels

Abstract

Accurate estimates of convective and radiative heat transfer in the magnetohydrodynamic channel are provided by simultaneousl y solving the radiation transport equation and the quasi-three-dimensional gasdynamic equations. Carbon dioxide, water vapor, and potassium atoms are considered as the principal constituents participating in gas radiation. Calculations performed for a base load-size channel indicate that heat transfer by gas radiation almost equals that by convection for smooth walls, and amounts to three-fourths as much as the convective heat transfer for rough walls. The evolution of slag particles by homogeneous nucleation and condensation is also investigated. The slag particle size spectrum is computed as a function of the ash carryover rate from the combustor to channel. The average particle size is found to increase and the total number density to decrease with ash carryover rate.