Mass Transfer
Blowdown in a cooling tower

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

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Mass Transfer
To get high tray efficiency

Interfacial surface between liquid and gas phase should be large
Gas velocity should be very low
Time of contact between the two phases should be less
Liquid entrainment should be severe

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