Discussion
Flooding in a packed tower occurs when
Answer: B
Correct answer: Upward gas prevents the liquid draining
As the gas velocity rises, the drag it exerts on the descending liquid increases until the liquid can no longer drain freely. It accumulates in the packing, the void space fills, the pressure drop rises very steeply, and liquid is carried out of the top of the tower. Towers are therefore designed at 60 to 70 per cent of the flooding velocity, leaving margin for the load variations of normal operation.
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