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2017 | OriginalPaper | Buchkapitel

12. Thermal Radiation

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Abstract

Thermal radiation is type of energy that is transferred by the direct contact of molecules, not by the movement of the material. All materials radiate thermal energy in amounts determined by their temperature, where the energy is carried by photons of light in the infrared and visible portions of the electromagnetic spectrum. When temperatures are uniform, the radiative flux between objects is in equilibrium and no net thermal energy is exchanged. The balance is upset when temperatures are not uniform, and thermal energy is transported from surfaces of higher to surfaces of lower temperature. An example of such event is, when heat felt while standing away from a large fire on a calm night. Everything that has a temperature above absolute zero radiates energy. Radiation is not “felt” until it is absorbed by a substance. It does not require a medium to transfer energy through as do conduction and convection. Thermal radiation is emitted when a body is heated, in wavelengths primarily in the 0.1–10 μm range.

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Literatur
1.
Zurück zum Zitat J.H. Lienhard, A Heat Transfer Textbook, 2nd edn. (Prentice-Hall, Inc., Englewood Cliffs, NJ, 1987) J.H. Lienhard, A Heat Transfer Textbook, 2nd edn. (Prentice-Hall, Inc., Englewood Cliffs, NJ, 1987)
2.
Zurück zum Zitat R. Siegel, J.R. Howell, Thermal Radiation Heat Transfer, 2nd edn. (Hemisphere, New York, 1981) R. Siegel, J.R. Howell, Thermal Radiation Heat Transfer, 2nd edn. (Hemisphere, New York, 1981)
3.
Zurück zum Zitat A.K. Oppenheim, Radiation analysis by the network method. Trans. ASME 78, 725–735 (1956) A.K. Oppenheim, Radiation analysis by the network method. Trans. ASME 78, 725–735 (1956)
4.
Zurück zum Zitat H.C. Hottel, in Heat Transmission, Chap. 4, 3rd edn., ed. by W. H. McAdams. Radiant-heat transmission (McGraw-Hill, New York, 1954) H.C. Hottel, in Heat Transmission, Chap. 4, 3rd edn., ed. by W. H. McAdams. Radiant-heat transmission (McGraw-Hill, New York, 1954)
5.
Zurück zum Zitat M. Necati Ozisk, Basic Heat Transfer, 1st edn. (McGraw-Hill, 1997) M. Necati Ozisk, Basic Heat Transfer, 1st edn. (McGraw-Hill, 1997)
6.
Zurück zum Zitat K.A. Gardner, Efficiency of extended surfaces. Trans. ASME 67, 621–631 (1945) K.A. Gardner, Efficiency of extended surfaces. Trans. ASME 67, 621–631 (1945)
Metadaten
Titel
Thermal Radiation
verfasst von
Bahman Zohuri
Copyright-Jahr
2017
DOI
https://doi.org/10.1007/978-3-319-53829-7_12