RADIATIVE ENHANCEMENT OF HEAT-TRANSFER TO A GRAY GAS THROUGH PARTICLESEEDING

Combined effects of radiation and convection are examined in turbulent flow of gray gases, dispersely seeded with absorbing, emitting scatte ring particles. Seeding particles are used as a heat transfer enhancem ent technique, whereby radiatively participating particles receive rad iation from hot tube walls, and transfer this heat to the gas. It is f ound that enhanced heating of the gas is only achieved for low gas opt ical thicknesses and when the seeding particles are small and either h ollow or of low material density. Enhancements are identified for both radiation-dominated and combined mode (radiation/convection) cases, a s functions of dimensionless parameters.