M

is

the fraction of the packing wetted, and

e

is

the fractional voidage of the packing.

Pratt(80) gives several plots of pw against Lp, as shown in Figure 11.62, where Lp is the liquid rate based on the periphery of the packing, in m3/s m. The periphery is taken as a-1(m3/m2), although this is only correct for geometrical systems such as stacked rings.

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