Abstract
AbstractA fluorimetric technique was used to determine detailed residence time and velocity distribution on commercial sieve trays installed in a five‐tray, 1.22 m dia. air/water simulator. Results show a strong effect of the gas rate on the residence time distribution. At low air rates, isochron lines of high residence time are found at the column wall, and the variance distributions suggest the existence of zones of different degrees of mixing. The velocity profiles at Fs (vapor velocity load) factors less than 0.65 show severe flow nonuniformities characterized by a high velocity at the centerline and stagnant zone close to the wall. At higher Fs factors the velocity maldistribution seems to be relatively mild. Correlations are presented to estimate the velocity distribution on the tray as a function of the gas rate.
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