Diffuse Radiosity and Real Surfaces in Engineering Calculations
18 Questions
1 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

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?

    <p>Eb - Emissive power</p> Signup and view all the answers

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

    <p>Constant properties</p> 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?

    <p>Net radiation</p> Signup and view all the answers

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

    <p>View factor, F12</p> Signup and view all the answers

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

    <p>Net radiation exchange</p> Signup and view all the answers

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

    <p>Q12 = Eb1A1F12 - Eb2A2F21</p> Signup and view all the answers

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

    <p>A1F12 = A2F21</p> Signup and view all the answers

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

    <p>Diffuse emitters</p> Signup and view all the answers

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

    <p>Net radiation exchange can be negative</p> Signup and view all the answers

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

    <p>The intensity of radiation is constant in all directions</p> Signup and view all the answers

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

    <p>Radiation intensity is constant in all directions</p> 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?

    <p>94.61%</p> Signup and view all the answers

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

    <p>92% of light passes through the glass</p> Signup and view all the answers

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

    <p>Has no impact on solar energy transmission</p> Signup and view all the answers

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

    <p>Negligibly affects radiation transmission</p> Signup and view all the answers

    More Like This

    Electrical Engineering Calculations Quiz
    23 questions
    Rope Diameter Calculations
    21 questions

    Rope Diameter Calculations

    PromisingJadeite8923 avatar
    PromisingJadeite8923
    Aplicaciones de Tubos Venturi
    13 questions
    Use Quizgecko on...
    Browser
    Browser