Radiation heat transfer
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Radiation Properties
Conduction and convection are heat transfer processes that require the presence of a medium [1].
Radiation heat transfer is characteristically different from the other two in which it does not require a medium and, in fact it reaches maximum efficiency in a vacuum. Electromagnetic radiation has some proper characteristics depending on the frequency and wavelengths of the radiation, as shown in Figure 1.
The phenomenon of radiation is not yet fully understood. Two theories have been used to explain radiation; however neither of them is perfectly satisfactory.
First, the earlier theory which originated from the concept of a hypothetical medium referred as ether. Ether supposedly fills all evacuated or non evacuated spaces. The transmission of light or of radiant heat are allowed by the propagation of electromagnetic waves in the ether [3]. Electromagnetic waves have similar characteristics to television and radio broadcasting waves they only differ in wavelength [4]. All electromagnetic waves travel at the same speed; therefore, shorter wavelengths are associated with high frequencies. Since every body or fluid is submerged in the ether, due to the vibration of the molecules, any body or fluid can potentially initiate an electromagnetic wave. All bodies generate and receive electromagnetic waves at the expense of its stored energy </ref> Becker, Martin. Heat Transfer a Modern Approach New York: Plenum Publishing Corporation, 1986. <ref>
- ^ Hsu, Shao Ti. Engineering Heat Transfer. Blacksburg, Virginia:D. Van Nostrand Company, Inc.,1962.
- ^ Edu Space. 12 April 2010 .http://www.eduspace.esa.int/subtopic.asp?document=295>.
- ^ Hsu, Shao Ti. Engineering Heat Transfer. Blacksburg, Virginia:D. Van Nostrand Company, Inc.,1962.
- ^ Becker, Martin. Heat Transfer a Modern Approach New York: Plenum Publishing Corporation, 1986.