Mass Transfer
Blowdown in a cooling tower

Means discarding a small fraction of circulating water to prevent and limit the concentration of salt and impurities
All of these
Increases the scale forming tendencies of water
Is undesirable

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

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
All of these

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