关键词: trickle bed;liquid distribution;hysteresis;residence timedistribution

Abstract: Experiments were conducted on a trickle bed with 0.283 m ID toelucidate the relation-ship
between hysteretic phenomena and liquiddistribution. The hysteresis of pressure drop and
the variance of radialliquid distribution were observed simultaneously. Residence time
distribution(RTD), holdup and mean residence time (RT) of liquid phase were alsofound to
demonstrate hysteresis of the same nature. RTD, liquid holdupand mean RT calculated with a
simple model from the distribution ofliquid flow rate show characteristics consistant with
the experimentaldata, suggesting that the hyteretic phenomena originate from
themultiplicity and nonuniformity of liquid flow distribution.

Key words: trickle bed, liquid distribution, hysteresis, residence timedistribution