Question

A gray, diffuse opaque surface (Absorptivity α = 0.8) is at 100ºC and receives an irradiation 1000 W/m2. If the surface area is 0.1 m2, calculate

i. Radiosity of the surface

ii. Net radiative heat transfer rate from the surface

iii. Calculate above quantities if surface is black.

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Answer 1

Answer:

What do you mean by spectral and total emissivity.

Spectral emissivity can be defined as the spectral distribution of the monochromatic emissivity of material and that, in turn, is described as the ratio of the actual (emitted) rad

What is a black body? What are its properties.

A blackbody is a theoretically ideal radiator and absorber of energy at all electromagnetic wavelengths.

Properties:

• It is a perfect absorber.
• It i

Emissivity of a white polished body in comparison to a black body is

Emissivity of a white polished body in comparison to a black body is lower.

Answer 2

Step-by-step explanation:

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