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Thermal-Hydraulics of Water Cooled Nuclear Reactors by Francesco D'Auria

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7.3 Radiative heat transfer

7.3.1 Basic principles

Thermal radiation is a portion of the process of energy propagation by means of electromagnetic waves. When it is in thermodynamic equilibrium with a substance, we call it an equilibrium radiation. The radiation results from changes in electronic, vibrational, and rotational states of the atoms-molecules and the emission of the radiant energy takes place as a result of irregular deceleration of charged particles (electrons, ions) in the media. The reverse process is then what occurs when radiant energy impinges on a solid surface and causes its temperature rise (absorption).

From a corpuscular point of view, the radiant energy is emitted and absorbed in discrete forms of the electromagnetic ...

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