Mass Transfer
Drying operation under vacuum is carried out to

Reduce drying temperature
Increase drying temperature
Dry those materials which have very high unbound mositure content
Dry materials having high bound moisture content

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Mass Transfer
Experiments were conducted to determine the flux of a species A in a stagnant medium across a gas-liquid interface. The overall mass transfer co-efficient based on the liquid side for dilute systems for the above was estimated to be 4 x 10⁻³ kg mole/m².s. The equilibrium data for the system is given as y = 2x. The flux across the interface (in kg mole/m² .s) for bulk concentrations of A in gas phase and liquid phase as y = 0.4 and x = 0.01 respectively is

8.5 x 10⁻⁴
5.6 x 10⁻³
5.6 x 10⁻⁴
8.5 x 10⁻³

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