Speeds of thermal diffusion

Junchang Li; Yunchang Fu

doi:10.1117/12.361113

8 September 1999 Speeds of thermal diffusion

Junchang Li, Yunchang Fu

Proceedings Volume 3862, 1999 International Conference on Industrial Lasers; (1999) https://doi.org/10.1117/12.361113
Event: International Symposium on Industrial Lasers, 1999, Wuhan, China

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.

Citation Download Citation

Junchang Li and Yunchang Fu "Speeds of thermal diffusion", Proc. SPIE 3862, 1999 International Conference on Industrial Lasers, (8 September 1999); https://doi.org/10.1117/12.361113

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