Mass Transfer
The reason for preferring packed towers over plate towers in distillation practice is that the packed tower operation gives

Low pressure drop and low hold up
High pressure drop and low hold up
Low pressure drop and high hold up
High pressure drop and high hold up

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Mass Transfer
Channelling is most severe

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

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