Related Questions

The ratio of momentum diffusivity to thermal diffusivity is the __________ number.
A Prandtl
B Nusselt
C Stanton
D Grashoff
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
If mass diffusivity in a mixture is equal to the thermal diffusivity, then the Lewis number is
A 0
B 1
C > 1
Which of the following has the same dimension as mass diffusivity?
A Momentum flux
B Kinematic viscosity
C Thermal diffusivity
D Both A & B
Dimension of mass diffusivity is the same as that of
A Kinematic viscosity
B Dynamic viscosity
C Surface tension
D Pressure
A snapshot measures 5/2 inches by 15/8 inches. It is to be enlarged so that the longer dimension will be 4 inches. What will be the length of the enlarged shorter dimension then?
A 2 : 1
B 4 : 3
C 1 : 2
D 4 :2
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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