Thermal diffusivity is

A A dimensionless parameter
B Function of temperature
C Used as mathematical model
D A physical property of the material

Correct Answer: A physical property of the material

Thermal Diffusivity is defined as the ratio of heat conducted to the heat energy stored per unit volume of a material.
Its SI unit is m2/s.
It describes how fast heat can be transferred across the medium.
Greater the value of thermal diffusivity, faster is the propagation of heat through the medium.
Bissoy MCQ
#Mechanical Engineering #Heat And Mass Transfer

Related Questions

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
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
Thermal diffusivity of a substance is proportional to (where, k = Thermal conductivity)
A $$\frac{1}{{\text{k}}}$$
B k
C k2
D $$\frac{1}{{{{\text{k}}^2}}}$$
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
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
Unit of thermal diffusivity is
A m2/hr
B m2/hr °C
C kcal/m2 hr
D kcal/m hr °C
The highest thermal diffusivity is of
A Iron
B Lead
C Concrete
D Wood
The lowest thermal diffusivity is of
A Iron
B Lead
C Aluminium
D Rubber

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