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Mass Transfer

Mass Transfer
NSc/NPr is called the

Lewis number
Psychrometric ratio
Sherwood number
Stantan number

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Mass Transfer
Penetration theory states that the mass transfer co-coefficient is equal to (where, De is diffusivity and 't' is time)

(De.t)1/2
(De/t)1/2
(4De/t)
(4De/πt)1/2

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Mass Transfer
If a₁ and a₂ are the relative volatilities when the pressure in the distillation column is 1 and 2 atm respectively. Pick out the correct statement.

a₁ = a₂
None of these
a₁ = 2a₂
a₁ = 0.5 a₂

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Mass Transfer
Mass transfer co-efficient (K) and diffusivity (D) are related according to film theory as

K ∝ √D
K ∝ D2
K ∝ D1.5
K ∝ D

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Mass Transfer
Dry bulb temperature of unsaturated air is more than its __________ temperature.

Wet bulb
Neither A nor B
Dew point
Both A & B

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Mass Transfer
Which of the following has the same dimension as mass diffusivity?

Both Momentum flux & Kinematic viscosity
Thermal diffusivity
Momentum flux
Kinematic viscosity

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