PROPERTIES OF POISING FLOW IN A TRICKLE-BED

An experimental study of pulsing flow in trickle beds is presented bas ed on data from two measuring techniques. New evidence on pulse arrang ement and propagation in the bed, and data on basic pulse characterist ics (frequency, celerity, length, duration) as well as liquid holdup a nd pressure drop measurements are included. Some of these data, such a s the length of the liquid-rich zone of pulses, are not currently avai lable. Two flow regions exhibit different trends of pulse characterist ics, ''mild'' and ''wild'' pulsing for relatively small and large liqu id flow rates, respectively. New findings are compared with previously available data and correlations. An effort to develop new or modify e xisting generalized correlations is made for the aforementioned quanti ties.