Mass Transfer
Channelling is most severe

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

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Mass Transfer
Inside the distillation column, the

Driving force for the vapour flow is the pressure drop
None of these
Liquids are not always at their bubble points
Pressure increases gradually from bottom to the top of the column

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