Mass Transfer
An example of elutioh is

Separation of sugar from sugar beet by hot water
Separation of uranium oxide from its ore by H₂SO₄ in a Pachuca tank
Dissolution of tannin out of tree barks by water
Recovery of vegetable oils from seeds

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Mass Transfer
Flights in a rotary dryer are provided to

None of these
Lift and shower the solids thus exposing it thoroughly to the drying action of the gas
Reduce the residence time of solid
Increase the residence time of the solid

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Mass Transfer
For the air water system under ambient conditions, the adiabatic saturation temperature and the wet bulb temperature are nearly equal, because

Water has a high latent heat of evaporation
Lewis number is close to unity
They are always equal under all circumstances
Solubility of the components of air in water is very small

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Mass Transfer
Blowdown in a cooling tower

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

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