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

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

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Mass Transfer
A 25 cm x 25 cm x 1 cm flat sheet weighing 1.2 kg initially was dried from both sides under constant drying rate conditions. It took 1500 seconds for the weight of the sheet to reduce to 1.05 kg. Another 1m x 1m x 1cm flat sheet of the same material is to be dried from one side only.Under the same constant drying rate conditions, the time required for drying (in seconds) from its initial weight of 19.2 kg to 17.6 kg is

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