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Chemical Engineering - Heat Transfer

Exercise : Heat Transfer - Section 7
6.
Absorptivity of a perfect black body is unity. Which of the following has maximum absorptivity ?
aluminium foil
refractory bricks
iron plate
coke breeze
Answer: Option
Explanation:
No answer description is available. Let's discuss.
7.
Thermal diffusivity is given by
Answer: Option
Explanation:

Thermal diffusivity =

k is thermal conductivity (W/(mK).

ρ is density (kg/m3).

cp is specific heat capacity (J/(kgK)).

8.
At what value of Prandtl number, the hydrodynamic and thermal boundary layers of a fluid flowing over a heated plate will be identical ?
1
< 1
> 1
none of these
Answer: Option
Explanation:
No answer description is available. Let's discuss.
9.
Fourier's law of heat conduction applies to __________ surfaces.
isothermal
non-isothermal
both (a) and (b)
neither (a) and (b)
Answer: Option
Explanation:
No answer description is available. Let's discuss.
10.
__________ chart is known as transient heat conduction chart.
Dirhing's
Heisler's
Mollier's
Cox
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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