Mass Transfer
The velocity, concentration and temperature boundary, for the boundary layer development on a flat plate during connective mass transfer will be same, if

NSc = NLe
NSc = 1
NSc = NPr = NLe
NPr = NLe

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Mass Transfer
In case of steam distillation, the steam leaving the liquid is not completely saturated with distillate vapour, because

Temperature is less
Total pressure is less
Mixing of steam with the material being vaporised is not so intimate as to result in equilibrium condition
Saturated steam is used for steam distillation

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