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Mass Transfer

Mass Transfer
The unit of volumetric diffusivity is

Cm²/sec
Cm/sec
Cm³/sec
Cm²/seC₂

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Mass Transfer
Dimension of mass diffusivity is the same as that of

Kinematic viscosity
Pressure
Dynamic viscosity
Surface tension

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

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Mass Transfer
Which of the following decreases during evaporative cooling process with recirculated water supply?

None of these
Relative humidity
Partial pressure of vapour
Wet bulb temperature

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Mass Transfer
The individual mass transfer co-efficients (moles/m² . s) for absorption of a solute from a gas mixture into a liquid solvent are, KL = 4.5 and KG = 1.5. The slope of the equilibrium line is 3. Which of the following resistance (s) is (are) controlling ?

Liquid side
Both liquid and gas side
Interfacial
Gas side

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Mass Transfer
To increase the absorption factor, (where, G = gas flow rate, S = solvent flow rate)

Decrease both 'G' and 'S'
Increase both 'G' and 'S'
Increase 'S' and decrease 'G'
Increase 'G' and decrease 'S'

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