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Mass Transfer

Mass Transfer
Liquid diffusivity is of the order of __________ cm² /second.

0.01
> 1
10-5 to 10-6
0.1

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Mass Transfer
At a fixed total pressure, humidity depends only on the

Density of the vapour
Heat capacity of the vapour
Partial pressure of vapour in the mixture
None of these

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Mass Transfer
The drying time between fixed moisture content within diffusion controlled 'falling rate period' is proportional to (assuming that drying occurs from all surfaces of the solid) (where, T = thickness of the solid )

√T
T²
T³
T

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Mass Transfer
Surface renewal model of mass transfer was enunciated by

Stefan
Danckwerts
Fick
Toor and Marchello

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Mass Transfer
Sand is dried in foundaries in a___drier.

Vacuum
Fluidisedbed
Rotary
Spray

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Mass Transfer
The mass transfer co-efficient for a solid sphere of radius 'a' dissolving in a large volume of quiescent liquid, in which D is the diffusivity of solute, is

D/2a
D/a
Dependent on the Reynolds number
Proportional to √D

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