Diffuse Radiosity and Real Surfaces in Engineering Calculations

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What term is used to describe the rate of total radiant energy leaving a surface per unit surface area?

Radiosity (correct)

Absorptivity

Reflectivity

Emissivity

In the context of radiation problems, what type of body is assumed to have constant monochromatic properties over all wavelengths?

White body

Transparent body

Black body

Gray body (correct)

What does the term 'specular reflection' refer to in the context of radiation?

Reflection in all directions

Uniform reflection

Perfect reflection

Reflection at an angle equal to the incident ray (correct)

Which term represents the blackbody emissive power per unit surface area?

Eb - Emissive power Signup and view all the answers

What does a gray body assume about its properties over all wavelengths?

Constant properties Signup and view all the answers

What is the term used to describe the radiant energy leaving a surface that includes both original emission and reflected rays?

Net radiation Signup and view all the answers

What is the term defined as the fraction of radiation leaving surface A1 that reaches surface A2?

View factor, F12 Signup and view all the answers

In the equation Q12 = Eb1A1F12 - Eb2A2F21, what does the term 'Q12' represent?

Net radiation exchange Signup and view all the answers

If both surfaces are black and absorb all incident radiation, what is the net radiation exchange given by?

Q12 = Eb1A1F12 - Eb2A2F21 Signup and view all the answers

When both surfaces are of the same temperature, what is the relationship between A1F12 and A2F21?

A1F12 = A2F21 Signup and view all the answers

What type of emitters does Eq.(2.59) apply to?

Diffuse emitters Signup and view all the answers

What happens to the net radiation exchange if both surfaces have different temperatures?

Net radiation exchange can be negative Signup and view all the answers

For a real surface, what does the term 'diffuse radiosity' refer to?

The intensity of radiation is constant in all directions Signup and view all the answers

What does the equation J = p*I represent for a real surface?

Radiation intensity is constant in all directions Signup and view all the answers

In Example 2.10, what percentage of incident solar energy is transmitted through the glass for wavelengths 0.3 to 3.0 mm?

94.61% Signup and view all the answers

Based on the provided example, what does a glass with transmissivity of 0.92 mean?

92% of light passes through the glass Signup and view all the answers

What role does atmospheric attenuation play in the calculation of radiation transmission through the glass?

Has no impact on solar energy transmission Signup and view all the answers

How does a blackbody at 373 K affect the radiation emitted through the glass in Example 2.10?

Negligibly affects radiation transmission Signup and view all the answers