C R R A N und M . IM. ZRZZARHY' De#mrtmmt of Chemical Engineering, University of Puerto Rim, Mayaguez, P w r t o R k oThe effects of chemical reactions on wall heat transfer coefficients in packed bed reactors operating at equilibrium or near equiliirium conditions are explored by means of onedimensional and two-dimensional models. Both approaches suggest using Damkohler number or ratios of reacting to frozen heat capacity as parametcrs in heat transfer correlations. Available data for the methane-steam reforming reactors were u s 4 to establish a suitable correlation for use in thermal design of reacting beds of solids, i.e. N,. = 0.195 NRIa.B exp. (0.21 6)