Mass Transfer
Plate efficiency

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

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

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

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