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Mass Transfer

Mass Transfer
For turbulent mass transfer in pipes, the Sherwood number depends on the Reynolds number as

Re0.53
Re0.83
Re
Re0.33

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Mass Transfer
For the gas absorption, the height of a transfer unit, based on the gas phase is given by (G: superficial molar gas velocity, L: superficial molar liquid velocity, FG:mass transfer co-efficient, mols/m² , a: in-terfacial area per unit volume of tower)

FG/(G.a)
(G.a)/FG
F/(FG.a)
L/(FG.G)

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Mass Transfer
With increase in temperature, the leaching rate increases because of the

Both Decreased viscosity of liquid & Increased diffusivity
None of the listed here
Decreased viscosity of liquid
Increased diffusivity

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Mass Transfer
A solid material shows case hardening properties while drying. Which of the following should be controlled to control the drying process?

Flow rate of inlet air
Relative humidity of outlet air
Temperature of the solid
Humidity of inlet air

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Mass Transfer
Heat in BTU necessary to increase the temperature of 1 lb of gas and its accompanying vapour by 1°F is called the

Specific heat
Latent heat
Humid heat
Sensible heat

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Mass Transfer
McCabe-Thiele method of binary distillation does not assume that the

None of these
Molar latent heats of all components are equal
Sensible heat changes are negligible compared with latent heat changes
Heat of mixing is negligible

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