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Mass Transfer

Mass Transfer
In case of liquids, the binary diffusivity is proportional to (where, T = temperature)

√T
T²
1/T
T

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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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Mass Transfer
When both the fluids flow concurrently in an absorber, the slope of the operating line is

+ ve
1
-1
- ve

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Mass Transfer
For the case of flow of air past a wet bulb thermometer (air water vapour system), the approximate value of H₂/ky.Cz is around

0.24
0.72
1
0.6

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Mass Transfer
The drying time between fixed moisture content within diffusion controlled 'falling rate period' is proportional to (assuming that drying occurs from all surfaces of the solid) (where, T = thickness of the solid )

√T
T²
T
T³

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Mass Transfer
Air initially at 101. 3 kPa and 40°C and with a relative humidity of 50%, is cooled at constant pressure to 30°C. The cooled air has a

Higher absolute (specific) humidity
Higher dew point
Higher relative humidity
Higher wet bulb temperature

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