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Mass Transfer

Mass Transfer
Penetration model (theory) for mass transfer was enunciated by

Toor and Marchello
Danckwerts
Kissinevskii
Higbie

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Mass Transfer
An alkaline solution is used to reduce the concentration of carbon dioxide in a stream from 10% to 0.1% by absorption with irreversible chemical reaction. The overall number of transfer units based on gas phase is

9.21
4.605
0.001
100

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Mass Transfer
The interfacial area per unit volume of dispersion, in a gas-liquid contactor, for fractional hold up of gas = 0.1 and gas bubble diameter = 0.5 mm is given by (in m²/m³)

1000
50
100
500

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Mass Transfer
Separation of __________ employs gaseous diffusion process.

Isotopes of helium
N₂ and O₂ from air
Isotopes of uranium
SO₂ and air

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Mass Transfer
Lewis number, which is important in problems involving simultaneous heat and mass transfer, is the ratio of

Momentum diffusivity to thermal diffusivity
Thermal diffusivity to mass diffusivity
Mass diffusivity to momentum diffusivity
None of these

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Mass Transfer
Which of the following is used for the concentration of rubber latex?

Agitated film evaporator
Short tube evaporator
Calendria
Long tube vertical evaporator

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