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Mass Transfer

Mass Transfer
The value of Lewis number (Le = Sc/Pr) for air-water vapour system is around

600
0.24
3.97
1

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Mass Transfer
Batch tray dryers suffers from the disadvantage of

Non-uniform & low production rate
High maintenance cost
All of the listed here
High labour cost & low heat economy

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Mass Transfer
The caking of crystals can be prevented by

Maintaining low critical humidity
Both A and C
Coating the product with inert material
Maintaining high critical humidity

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Mass Transfer
A pure drug is administered as a sphere and as a cube. The amount of drug is the same in the two tablets. Assuming that the shape and size do not influence the mass transfer, the ratio of rate of dissolution in water at t = 0 for the cubic to spherical tablet is

1.04
1.94
0.54
1.24

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Mass Transfer
Equilibrium-moisture curves of different solids

Depend on the humidity of the gas
Are same
Are different
None of these

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Mass Transfer
The Kundsen diffusivity is proportional to (where, T = absolute temperature)

T
T²
T⁴
√T

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