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首页> 外文期刊>Journal of Heat Transfer >Heat Flux Determination From Measured Heating Rates Using Thermographic Phosphors
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Heat Flux Determination From Measured Heating Rates Using Thermographic Phosphors

机译：使用热成像荧光粉根据测得的加热速率确定热通量

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摘要

A new method for measuring the heating rate (defined as the time rate of change of temperature) and estimating heat flux from the heating rate is proposed. The example problem involves analytic heat conduction in a one-dimensional slab, where the measurement location of temperature or heating rate coincides with the location of the estimated heat flux. The new method involves the solution to a Volterra equation of the second kind, which is inherently more stable than Volterra equations of the first kind. The solution for heat flux from a measured temperature is generally a first kind Volterra equation. Estimates from the new approach are compared to estimates from measured temperatures. The heating rate measurements are accomplished by leveraging the temperature dependent decay rate of thermographic phosphors (TGP). Results indicate that the new data-reduction method is far more stable than the usual minimization of temperature residuals, which results in errors that are 1.5—12 times larger than those of the new approach. Furthermore, noise in TGP measurements was found to give an uncertainty of 4% in the heating rate measurement, which is comparable to the noise introduced in the test case data. Results of the simulations and the level of noise in TGP measurements suggest that this novel approach to heat flux determination is viable.
机译：提出了一种测量加热速率（定义为温度变化的时间速率）并根据加热速率估算热通量的新方法。示例问题涉及一维平板中的解析热传导，其中温度或加热速率的测量位置与估算的热通量的位置重合。新方法涉及到第二种Volterra方程的解，其本质上比第一种Volterra方程更稳定。来自测量温度的热通量的解通常是第一类Volterra方程。将新方法的估计值与实测温度的估计值进行比较。通过利用温度依赖性的热成像磷光体（TGP）衰减速率来完成加热速率的测量。结果表明，新的数据减少方法远比通常的最小化温度残差稳定得多，导致的误差是新方法的1.5至12倍。此外，发现TGP测量中的噪声在加热速率测量中给出了4％的不确定性，与测试用例数据中引入的噪声相当。模拟结果和TGP测量中的噪声水平表明，这种确定热通量的新方法是可行的。

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  • 来源
    《Journal of Heat Transfer》 |2005年第6期|p.560-570|共11页
  • 作者

    D. G. Walker;

  • 作者单位

    Department of Mechanical Engineering, Vanderbilt University, Nashville, TN 37235-1592;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 热力工程、热机;
  • 关键词

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