کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4995477 1458710 2017 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Surface temperature of carbon composite samples during thermal degradation
ترجمه فارسی عنوان
دمای سطح نمونه های کامپوزیتی کربن در طی تخریب حرارتی
کلمات کلیدی
پیرولیز، کالریمتر مخروطی تصویربرداری مادون قرمز، انتقال شعاعی، شناسایی دما، شار حرارتی، تابش شعله،
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی جریان سیال و فرایندهای انتقال
چکیده انگلیسی
An infrared camera and a Fourier transform infrared spectrometer were used simultaneously to observe the radiation from the surface of carbon composite samples during thermal degradation experiments. Surface temperatures were estimated from radiation measurements conducted during cone calorimeter tests. Infrared spectra and images were post-processed involving a subtraction method between successive images, to withdraw the high incident flux from the cone calorimeter partly reflected by the sample. The surface intensities were first evaluated as a function of time. Then, an identification step was implemented linking the rise in intensity between two time steps with the increase in sample temperature. Corrections were introduced for the reflection of the incident radiation from the heater and for the true emissivity of the material. Both experimental devices - camera and spectrometer - showed temperature evolutions in a good agreement. The sharp temperature increase of the sample and the auto-ignition of the pyrolysis gases on the surface were observed and evaluated for various incident fluxes from the cone between 20 and 65 kW/m2. Measurements carried out with a short time step down to 0.2 s further allowed an evaluation of the supplementary flux due to the auto-ignition with a peak up to 20 kW/m2 for an incident flux of 35 kW/m2 on a carbon composite sample with surface 50 mm × 300 mm and thickness 5 mm.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Thermal Sciences - Volume 112, February 2017, Pages 427-438
نویسندگان
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