Mass Transfer
Weeping in a distillation column

Results due to very low gas velocity
Increases tray efficiency
Provides large interfacial surface for mass transfer
Results due to very high gas velocity

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Mass Transfer
Blowdown in a cooling tower

Means discarding a small fraction of circulating water to prevent and limit the concentration of salt and impurities
Increases the scale forming tendencies of water
All of these
Is undesirable

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