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Mass Transfer

Mass Transfer
__________ developed the film theory.

Higbie
Ergun
Levenspeil
Fick

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

3.97
1
600
0.24

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Mass Transfer
Stacked packing compared to dumped packing

Gives lower pressure drop
Provides poorer contact between the fluids
Both A & B
Gives higher pressure drop

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Mass Transfer
According to Poiseuille's law, the permeability for gas flow through a capillary is proportional to (where, μ = gas viscosity)

μ
1/μ
μ²
√μ

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Mass Transfer
__________ column is used in gas absorption process.

Bubble cap
Wetted wall
Packed
Seive/perforated tray

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Mass Transfer
The mass diffusivity, the thermal diffusivity and the eddy momentum diffusivity are same for, NPr = NSc = __________

1
4
2
3

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