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

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

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Mass Transfer
Channelling is most severe

In towers packed randomly with crushed solids
In towers packed with stacked packing
In dumped packing of regular units
At very high liquid flow rate

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