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Mass Transfer

Mass Transfer
Prandtl number for water at 20°C is about

0.7
7
70
150

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Mass Transfer
The Schmidt number which is defined as, μ/ρ D, is the ratio of the

Thermal diffusivity to the mass diffusivity
Momentum diffusivity to the mass dif-fusivity
Momentum diffusivity to the thermal diffusivity
None of these

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Mass Transfer
Which of the following assumes constant molal vaporisation and overflow?

Enthalpy concentration method
McCabe-Thiele method
Plate absorption column
Ponchan-Savarit method

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

K ∝ D2
K ∝ D1.5
K ∝ √D
K ∝ D

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Mass Transfer
Humidification involves mass transfer between a pure liquid phase and a fixed gas, which is

At a fixed temperature
Non-ideal in nature
Insoluble in the liquid
Soluble in the liquid

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Mass Transfer
The diffusivity (D) in a binary gas mixture is related to the temperature (T) as

D ∝ T2
D ∝ T
D ∝ T1.5
D ∝ T0.5

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