In our previous paper, the holdup and the mixing characteristics of liquid flowing through the irrigated packed towers (I.D., 4-7cm) had been determined. An attempt was made, in this paper, to extend the range of experimental variables, in order to larify the influences of packing size and type as well as the ratio of packing diameter to tower, either on the holdup or on the mixing characteristics of the liquid in packed beds.For this purpose, the transient response curves were measured, by using larger packed beds, whose properties are listed in Table 1. From these response curves, the holdup and the mixing coefficients of liquid were determined by the graphical integration of the curves, based on Eq.(5) and by the method described in our previous paper, respectively.The experimental results of this study and of the other sutdies previously reported and summarized in Figs. 2, 3 and 4, show that the packing type and the ratio of the packing diameter to the tower diameter have little influence either on the holdup or on the mixing coefficients of the liquid in packed beds. Therefore, the generalized correlations have been obtained as follows:Eqs.(8) and (9) for the operating holdup of the liquid in irrigated packed beds.Eqs.(11) for the mixing coefficients of the liquid in irrigated packed beds.Eq.(10) for the mixing coefficients of the liquid in liquid-packed beds.