التفاصيل البيبلوغرافية
| العنوان: |
High power continuous wave laser heating of graphite in a high temperature range up to 3800 K. |
| المؤلفون: |
Gallais, L., Vidal, T., Lescoute, E., Pontillon, Y., Rullier, J. L. |
| المصدر: |
Journal of Applied Physics; 1/28/2021, Vol. 129 Issue 4, p1-11, 11p |
| مصطلحات موضوعية: |
HIGH temperatures, OCEAN wave power, HIGH power lasers, GRAPHITE, THERMAL conductivity, FINITE element method, CONTINUOUS wave lasers, EMISSIVITY |
| مستخلص: |
As graphite is an important material for several applications, the evaluation of its properties at very high temperatures is of major importance. Conducting studies at temperatures >2800 K is, however, very challenging, and the amount of available data in the literature is, therefore, very limited. This paper presents a methodology that compares experimental data with simulation results following a progressive increase of the temperature range investigated. The study was conducted on a commercial polycrystalline graphite produced by sintering (EDM-3 from POCO) under high power continuous laser heating (kW ytterbium at a wavelength of 1080 nm). Experiments were done inside a vacuum chamber equipped with pyrometers and cameras allowing fine monitoring of the temperature of the samples. A 3D numerical model has been developed based on the finite element method to analyze the experimental results. The evolution of the thermal and optical properties of EDM-3 with temperature is required for correctly modeling laser/material interactions. By running a sequential comparison of calculation with a dedicated experiment, we achieve better knowledge of such properties. From this study, we obtain estimations of the evolution of thermal conductivity, emissivity, and evaporation rate up to 3800 K of amorphous graphite. [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
Complementary Index |
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