Mass Transfer
To get high tray efficiency

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

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Mass Transfer
The term "cooling range" in a cooling tower refers to the difference in the temperature of

Hot water entering the tower and the wet bulb temperature of the surrounding air
Cold water leaving the tower and the wet bulb temperature of the surrounding air
None of the listed here
Hot water entering the tower and the cooled water leaving the tower

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