Mass Transfer
Plate efficiency

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

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Mass Transfer
A coalescer in a mixer-settler liquid-liquid extraction coloumn

All of these
Helps in increasing the bubble size entering the settler
Comprises of thin bed of substances of extended surface having high porosity
Helps in increasing the settling rate of the bubbles

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