Related Questions

If the catalyst pore size is small in comparison with the mean free path, collisions with the pore wall controls the process'. The diffusivity under this condition is called 'Knudsen diffusivity', which is affected by the
A Pressure
B Temperature
C Both A & B
D Neither A nor B
The ratio of momentum diffusivity to thermal diffusivity is the __________ number.
A Prandtl
B Nusselt
C Stanton
D Grashoff
If mass diffusivity in a mixture is equal to the thermal diffusivity, then the Lewis number is
A 0
B 1
C > 1
Knudsen diffusion is directly proportional to
A T
B $$\sqrt {\text{T}} $$
C $$\frac{1}{{\sqrt {\text{T}} }}$$
D T2
For the flow of gases through a capillary, with increase in temperature, the permeability __________ as per Knudsen law.
A Increases
B Decreases
C Remains same
D Either A or B; depends on the gas
In case of liquid-liquid binary diffusion, diffusivity of one constituent into another is not dependent on the
A Temperature and pressure
B Concentration
C Nature of the constituents
D None of these
The unit of thermal diffusivity is
A m2/hr-K
B kcal/m2-hr
C m2/hr
D m/hr-K
Thermal diffusivity is a
A Function of temperature
B Physical property of a substance
C Dimensionless parameter
D All of these
The eddy diffusivity for a liquid in plug flow must be
A 1
B 0
C ∞
D Between 0 and 1
Thermal diffusivity of a substance is
A Directly proportional to the thermal conductivity
B Inversely proportional to density of substance
C Inversely proportional to specific heat
D All of the above

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