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mer chairman of the Department of Chemical Engineering at the University of Puerto Rico, After receiving his doctorate from Johns Hopkins in 1964, he worked at Esso Engineering in Florham Park, N. J., and was in charge of a research effort on hydrogen production via steam reforming. In 1973 he was a NASA-ASEE Fellow at the JSC in Houston on a systems study of hydrogen production via thermochemical cycles.Hydrogen, from the greek Hydro, of water, and Gonon, the maker, was the second chemical element identified and christened by Antoine Lavoisier in the middle of the 18th century. Since then, it has always been associated

= volumetric expansion coefficient = dimensionless bulk mean temperature = dimensionless temperature function for horizontal = dimensionless temperature function for vertical LITERATURE CITED 1. Berman, A. S., . I .

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)

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