Radiation Definitions Flash Cards

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Title: Radiation Definitions
Description: Heat Transfer Quiz Definitions
Number of Cards: 8
Save Count: 0
Author: davetcoleman9
Created: 2009-10-13
Tags: heat transfer
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    • Question
    • Answer
    • Side 3
    • Emmissive Power
    • total rate of energy lost from a surface due to radiation heat transfer per unit area: function of the absolute temperature and emissivity
    • Emissivity
    • ratio of total emissive power from a real surface relative to a blackbody
    • Absorptivity
    • fraction of irradiation that is absorved by surface
    • Diffuse Irradiation
    • radiant energy that is arriving at the surface and is the sum of emission and reflection from other surfaces in the enclosure and is independent of angle (direction).
    • Blackbody Irradiation
    • radiant energy has the spectral distribution of a blackbody so that the irradiation is equal to the emissive power of a black body at the same temperature.
    • Surface Properties of Gray Surface
    • Emission and reflection are independent of wavelength
    • Surface Properties of Diffuse Surface
    • Emission and reflection are independent of direction
    • Radiosity (J)
    • sum of emissive power and reflected irradiation from a surface.