Mass Transfer
Blowdown in a cooling tower

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

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Mass Transfer
Plate efficiency

Is a function of the mass transfer between liquid and vapour
Increases due to weeping and dumping of liquid
Increases due to foaming
Increases due to liquid entrainment

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