Chemical Engineering Laboratory II - Experiment 10: Radiation Heat Transfer
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Questions and Answers

What is the objective of Experiment A?

  • To record the temperature and radiometer reading at ambient conditions
  • To show the inverse square law for heat radiation (correct)
  • To demonstrate the Stefan-Boltzmann law
  • To measure the intensity of radiation on a surface

    • According to the Stefan-Boltzmann law, what does 'qb' represent?

  • The total energy from an element dA flowing through a hemisphere
  • The temperature of the radiometer and surroundings
  • The energy emitted by unit area of a black body surface (correct)
  • The intensity of radiation in the φ direction

    • What does the solid angle subtended by dA at dA1 at dA represent?

  • The temperature and radiometer reading at ambient conditions
  • The intercepted area on a sphere divided by r^2 (correct)
  • The intensity of radiation in the φ direction
  • The rate of flow of energy through dA1

    • What is plotted against distance in Experiment A?

    <p>Radiometer reading</p> Signup and view all the answers

    What is the source temperature represented by in the Stefan-Boltzmann law?

    <p>Temperature Reading (Ts), 0 C</p> Signup and view all the answers

    What is the main objective of Experiment 10?

    <p>To investigate the Stefan-Boltzmann Law</p> Signup and view all the answers

    What does the Radiation Heat Transfer Rig consist of?

    <p>A pair of electrically heated radiant heat and light sources, along with targets and measuring instruments</p> Signup and view all the answers

    What can be placed between the heat radiation source and the light source in the Radiation Heat Transfer Rig?

    <p>A heat radiation detector or a light meter</p> Signup and view all the answers

    What are the accessories that can be fitted for various experimental purposes in the Radiation Heat Transfer Rig?

    <p>Metal plates with thermocouples attached, vertically oriented metal plates, and acrylic filters</p> Signup and view all the answers

    What enables the radiation detectors and accessories to be positioned at different distances from the appropriate source in the Radiation Heat Transfer Rig?

    <p>A scale mounted on the front track</p> Signup and view all the answers

    What does the unit consist of in the Radiation Heat Transfer Rig?

    <p>A horizontal bench mounted track fitted with a pair of electrically heated radiant heat and light sources, along with targets and measuring instruments</p> Signup and view all the answers

    What does the Stefan-Boltzman law state?

    <p>Energy emitted by unit area of a black body surface varies as the fourth power of the source temperature.</p> Signup and view all the answers

    What is the objective of Experiment A?

    <p>To show that tile intensity of radiation on a surface is inversely proportional to the square of the distance from the radiation source.</p> Signup and view all the answers

    What is plotted against distance in Experiment A?

    <p>Radiometer reading</p> Signup and view all the answers

    What does the solid angle subtended by dA at dA1 represent?

    <p>The intercepted area on a sphere divided by r^2.</p> Signup and view all the answers

    According to the text, what is represented by 'qb' in the Stefan-Boltzman law?

    <p>Energy emitted by unit area of a black body surface</p> Signup and view all the answers

    In Experiment B, what are the distances set to initially?

    <p>110 mm (radiometer to heat source) and 50 mm (black plate to heat source)</p> Signup and view all the answers

    What does 'σ' represent in the Stefan-Boltzman law?

    <p>Stefan-Boltzman constant</p> Signup and view all the answers

    What should be allowed before noting the radiometer reading in Experiment A?

    <p>Allow time for radiometer reading to stabilize</p> Signup and view all the answers

    'dQ1' in Experiment A is directly proportional to which factor?

    <p>'iφ'</p> Signup and view all the answers

    What are measured simultaneously in Experiment B?

    <p>Temperature and radiometer reading</p> Signup and view all the answers

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