Mass Transfer
Plate towers are preferred to packed towers, when large temperature changes are involved, because of the reason that the

Packing may be crushed due to thermal expansion/contraction of the components of the equipments
Pressure drop in the equipment will be very high
None of these
Viscosity variation of the fluids may cause channeling/flooding

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Mass Transfer
To get high tray efficiency

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

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