HEAT TRANSFER IN SEMITRANSPARENT MEDIUM CAUSED BY LASER PULSE
سال انتشار: 1387
نوع سند: مقاله ژورنالی
زبان: انگلیسی
مشاهده: 561
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شناسه ملی سند علمی:
JR_IJIEPR-19-7_007
تاریخ نمایه سازی: 7 شهریور 1393
چکیده مقاله:
In this paper, the combination of conduction with radiation into a semitransparent medium which includes absorption, emission and scattering has been investigated. In order to Study the conduction in medium, the Non-Fourier heat conduction has been applied. In this model there is a time delay between eatflux and temperature gradient. Also, in contrast with Fourier heat conduction, the speed of heat propagation is finite. The radiation transfer equation has been solved via P1 approximate method. Also to solve the energy conservation equation and Non-Fourier heat conduction simultaneously, flux-splitting method has been applied. The results show that the transient temperature responses are oscillatory for Non-Fourier heat conduction. Also the Non-Fourier effect can be important when the thermal relaxation time of heat conduction is large. In the initial times, the difference of transient temperature responses between the Fourier and the Non- Fourier heat conduction is large under this condition. For the laser-flash measurement of thermal diffusivity in semitransparent materials, omitting the Non- Fourier effect can result in significant errors.
کلیدواژه ها:
نویسندگان
E. Izadpanah
Department of Mechanical Engineering, Yazd University, Yazd,
S. Talebi
Department of Mechanical Engineering, Yazd University, Yazd
M.H. Hekmat
Department of Aerospace Engineering, K. N. Toosi University, Tehran,
A. Akhavan Taheri
Faculty of Mechanical Maritime and Materials Engineering, TU Delft University, Delft, Netherlands,