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
Viscosity variation of the fluids may cause channeling/flooding
None of these

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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 liquid entrainment
Increases due to foaming

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