Mass Transfer
The surface renewal frequency in Danckwerts model of mass transfer is given by (KL: mass transfer co-efficient)

√(KL².DA)
KL/DA²
KL².DA
KL²/DA

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Mass Transfer
In case of a desorber (stripper), the

Operating line always lies below the equilibrium curve
Temperature always increases
Temperature remains unaffected
Operating line always lies above the equilibrium curve

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