کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4991782 1457116 2017 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Research PaperNormal spectral emissivity of GH536 (HastelloyX) in three surface conditions
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی جریان سیال و فرایندهای انتقال
پیش نمایش صفحه اول مقاله
Research PaperNormal spectral emissivity of GH536 (HastelloyX) in three surface conditions
چکیده انگلیسی


- The normal emissivity of GH536 at moderate and high temperature is measured.
- The effects of oxidation and flame treatment process on emissivity are investigated.
- A modified emissivity model that can accurately predict the emissivity of GH536 is proposed.

The normal spectral emissivity of GH536, a nickel-based superalloy, is measured using a FT-IR spectrometer in the wavelength range 1-15 μm at moderate and high temperature (400-1200 K), as well as the samples with partially oxidized and flame treatment processed. It is found that the emissivity of GH536 decreases with the increasing of emission wavelength, which is well predicted by the electromagnetic wave theory, and increases linearly when the temperature rises. The emissivity of the other two samples with partially oxidized and flame treatment processed is also investigated in details. The results of the partially oxidized sample indicate that oxidation can enhance the emissivity significantly and alter the wavelength dependence trend. And the results of the flame treatment processed sample shows that the impurities and defects caused by the fire treatment process moderately increase the emissivity. The experimental data of GH536 is compared with the results calculated using Hagen-Rubens equation, which shows an inconsistence at high temperature condition. Therefore, a modified emissivity model is proposed, which has a good agreement in measured wavelength range at moderate and high temperature condition.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Thermal Engineering - Volume 113, 25 February 2017, Pages 20-26
نویسندگان
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