Abstract
A model for evaluating radiative heat fluxes in tubular heat exchangers is proposed. In this model it is assumed that individual tubes of the bundle are surrounded by a gaseous layer. The actual geometry was approximated by an equivalent cylindrical gaseous medium to simplify the problem. A mathematical procedure was developed based on this and other assumptions to evaluate the gas-radiation coefficient. The procedure can be incorporated in any arbitrary program for thermal and hydraulic calculation of a tubular heat exchanger. The applicability of this method for determination of the radiative heat transfer coefficient (hR) is demonstrated on the exchanger-type primary reformer, and the variation of hR under different geometric and operating conditions is studied using the procedure developed.
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