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A novel approach to temperature-dependent total emissivity estimation based on isothermal cooling
International Journal of Heat and Mass Transfer ( IF 5.2 ) Pub Date : 2018-08-01 , DOI: 10.1016/j.ijheatmasstransfer.2018.01.113
Zujun Peng , Weihua Xie , Songhe Meng , Weizhen Pan , Shanyi Du

Abstract This paper proposes a novel approach to estimate the temperature-dependent total emissivity based on the isothermal cooling process. The realizability of the ideal isothermal cooling phase has been verified through the finite-element model, even for specimens with low thermal conductivity. During the cooling process, the temperature difference of the specimen can be less than 0.8%. Moreover, based on the temperature curve of isothermal cooling, nonlinear total emissivity can be calculated using the inverse method over a broad temperature range, e.g., 500–1200 K, and the relative errors will be less than 8.83% with virtual test data. For a real-world application, we introduce the Savitzky-Golay (SG) filter to weaken the effect of noise on computation precision and successfully gain the smooth temperature-dependent total emissivity.

中文翻译:

基于等温冷却的温度相关总发射率估计的新方法

摘要 本文提出了一种基于等温冷却过程估算温度相关总辐射率的新方法。已通过有限元模型验证了理想等温冷却阶段的可实现性,即使对于导热率低的样品也是如此。在冷却过程中,试样的温差可以小于0.8%。此外,基于等温冷却的温度曲线,可以在较宽的温度范围内(例如500-1200 K)使用逆方法计算非线性总发射率,并且虚拟测试数据的相对误差将小于8.83%。对于实际应用,我们引入了 Savitzky-Golay (SG) 滤波器来削弱噪声对计算精度的影响,并成功获得与温度相关的平滑总发射率。
更新日期:2018-08-01
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