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3.6 T ed Beds o-Phase Fix w 159

Hopper

Vibrating system

Funel

Fall tube with wire
meshes for scattering

Packed bed

Figure 3.40 w-storm f ed beds ix Apparatus for snoilling of f

distribution in the bed. The liquid flow at the entrance of the bed (AB and BC) to the fully
developed flow section (CD) is shown in Figure 3.41.

There are three basic factors that affect the liquid distribution quality (Perry et al ., 1990):

(a) the number of drip points (density),
(b) the geometrical homogeneity of drip points, and
(c) the homogeneous flow of fluid through these points.

In the ideal case, the number of openings (pour or drip points) of the distrib utor should
be equal to the physical density of the bed channels (Stanek, 1994). In practice, in beds of
high diameter, this number should be between 35 and 251 openings/m 2 or alternatively, at
least one opening for eery 10 – 12 particles that occupy the cross-section of the bed
v
(Klemas and Bonilla, 1995).
ution of flow within the bed should be provided at intervals equal For fixed beds, redistrib
to 3–10 times the diameter of the bed (Treybal, 1980). It is a general rule that in fixed beds