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Article | REF: BE9812 V1

Heat transfers at low temperature

Authors: Bertrand BAUDOUY, Gérard DEFRESNE, Patxi DUTHIL, Jean-Pierre THERMEAU

Publication date: January 10, 2015, Review date: October 28, 2019 | Lire en français

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    4. Radiation

    Radiation is a method of exchanging energy between bodies using electromagnetic waves. Unlike other modes of exchange (convection, conduction, etc.), it requires no material support (solid or fluid) and can therefore take place at a distance, even (and especially) through a vacuum. Thermal radiation is in fact part of a large family: that of electromagnetic waves. All radiation can be broken down into a spectrum made up of so-called monochromatic radiations characterized by their frequency ν (Hz) or wavelength λ (m) :

    νλ=c

    with c = 3 × 10 8 m/s speed of light.

    Thermal radiation ranges from 0.1 μm (ultraviolet radiation)...

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