A novel approach to temperature-dependent total emissivity estimation based on isothermal cooling

作者：Peng, Zujun; Xie, Weihua; Meng, Songhe^*; Pan, Weizhen; Du, Shanyi

来源：International Journal of Heat and Mass Transfer, 2018, 123: 122-128.

DOI：10.1016/j.ijheatmasstransfer.2018.01.113

• Total emissivity
• Temperature-dependent
• Laser heating
• Isothermal cooling

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.

• 出版日期2018-8
• 单位哈尔滨工业大学