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

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

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Mass Transfer
In case of absorption with exothermic reaction, for fluids having

Pr = Sc; percentage change in heat and mass transfer flux will be the same for a given change in the degree of turbulence
Pr = Sc = 1; total mass, momentum and thermal diffusivity will be the same
Pr = Sc ; there won
Both A & B

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