SIMULTANEOUS RADIATIVE AND CONVECTIVE HEAT TRANSFER IN AN ABSORBING, EMITTING, AND SCATTERING MEDIUM IN SLUG FLOW BETWEEN PARALLEL PLATES
Description: The problem of coupled radiation and convection to a medium in slug flow between infinite, parallel plates was formulated in terms of discrete fluxes. Steady state, uniform heat input, and gray boundaries were assumed. The effects of absorption, emission, scattering, and flow were taken into account. For the general case where all these effects are present, it was necessary to approximate the fourth order temperature term by a truncated Taylor series. This approximation was not necessary for the special case where conductivity of the medium is negligible. Approximate, analytical solutions in closed-form for profiles of temperature, radiant fluxes, and heat fluxes were obtained for both the special case and the general case. Sample results are presented, showing the effects of convection, absolute temperature, absorption coefficient, scattering coefficient, and wall emissivities. The two cases of equal wall temperatures and unequal wall temperatures were both examined. It was found that for a fluid with the thermal conductivity of air, radiation can account for 60 to 95% of total heat transfer in the temperature range of 900 to 2800 deg R. It was also found that for some situations, the scattering phenomenon can have a much greater effect on heat transfer than the absorption and emission phenomena. (auth)
Date: March 18, 1963
Creator: Chen, J.C.
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