Abstract
Asymptotic solutions to the continuity and radiant energy equations are presented for tubular flow photoreactors under conditions of extremely small optical density. The asymptotic limits of the solutions to these equations are given when the optical density approaches infinity. The effects of radial and axial movement of reactant on the reactor performance under these limiting optical densities are given in graphical form. It is shown that in the absence of radial movement an optimum optical density exists for reactions whose rate depends explicitly on reactant concentration. An estimate of the greatest lower bound on the optimum optical density is given.
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