Mass Transfer
Channelling is most severe

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

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Mass Transfer
In a counter-current liquid extractor

Both liquids flow at fixed rate
Only one of the liquids may be pumped at any desired rate
Liquid's flow rate depends upon the temperature and pressure
Both liquids can have any desired flow rate

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