Fluid distribution perforated-pipe distributions

Figure 2.5 Distribution profiles of perforated pipe distributors.fa) Ideal distribution (b) excessive fluid velocity through pipe (c) same as for b, but with column vapor sucked in (d) insufficient perforation pressure drop (e) severe hydraulic disturbance near pipe inlet.

Where pressure drop is critical, a sparger pipe with the bottom quadrant cut out (rather than perforated) is sometimes used, but at the penalty of inferior vapor distribution. Similarly, the sparger can be entirely eliminated and substituted by a dog house baffle parallel to the direction of fluid entry. This baffle is somewhat wider than the nozzle diameter and stretches from wall to wall parallel to the direction of the incoming fluid. The author is familiar with one experience where addition of a "dog house baffle eliminated a packed-tower vapor maldistribution problem. 

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