Ch12-Intro to Radiation

Ch12-Intro to Radiation - Chapter 12 Radiation: Processes...

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Chapter 12 Radiation: Processes and Properties
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Radiation heat transfer mode is important in applications involving high temperatures. Engines Rocket nozzles Fires Sun Atmospheric radiation Space vehicles
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Attention is focused on thermal radiation, whose origins are associated with emission from matter at an absolute temperature. 0 T . Emission is due to oscillations and transitions of the many electrons that comprise matter, which are, in turn, sustained by the thermal energy of the matter. Emission corresponds to heat transfer from the matter and hence to a reduction in thermal energy stored by the matter. Unlike conduction and convection, radiation requires no medium. Radiation heat transfer can take place between two bodies separated by a medium colder than both bodies.
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The dual nature of radiation: In some cases, the physical manifestations of radiation may be explained by viewing it as particles (aka photons or quanta). In other cases, radiation behaves as an electromagnetic wave.
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Ch12-Intro to Radiation - Chapter 12 Radiation: Processes...

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