Mass Transfer
Use of raschig rings in place of crushed stones as packing in packed beds (other things being same)

Increases pressure drop, increases surface area
Increases pressure drop, decreases surface area
Decreases pressure drop, increases surface area
Decreases pressure drop, decreases surface area

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Mass Transfer
Plate efficiency

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

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