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Proceedings Paper

Speeds of thermal diffusion
Author(s): Junchang Li; Yunchang Fu
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Paper Abstract

When the time of thermal interaction is greater than the average free moving time of the microparticles in the medium, in general, it may been taken as the continuous medium which thermal properties are constants and 2(root)(alpha) t and (root)(alpha) /t are usually regarded as the thermal diffusive length and the thermal diffusive speed in time t respectively, where (alpha) is the diffusivity of the substance. In this paper, we have investigated the diffusion of the heat energy and defined the thermal diffusive length and the thermal diffusive speed as 3(root)(alpha) t and 1(DOT)5(root)(alpha) /t, with which the physical processes of the thermal conduction in the three- dimension continuous medium can be described more accurately. Finally, using the obtained results, we have listed the applied examples of the laser heat treatment in which whether the semi-infinite approximation calculation can be taken.

Paper Details

Date Published: 8 September 1999
PDF: 6 pages
Proc. SPIE 3862, 1999 International Conference on Industrial Lasers, (8 September 1999); doi: 10.1117/12.361113
Show Author Affiliations
Junchang Li, Kunming Univ. of Science and Technology (China)
Yunchang Fu, Kunming Univ. of Science and Technology (China)


Published in SPIE Proceedings Vol. 3862:
1999 International Conference on Industrial Lasers
Fuxi Gan; Horst Weber; Zaiguang Li; Qingming Chen, Editor(s)

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