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首页> 外文期刊>Journal of Heat Transfer >Simultaneous Retrieval of Total Hemispherical Emissivity and Specific Heat From Transient Multimode Heat Transfer Experiments
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Simultaneous Retrieval of Total Hemispherical Emissivity and Specific Heat From Transient Multimode Heat Transfer Experiments

机译：从瞬态多模传热实验中同时获取总半球发射率和比热

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摘要

Transient cooling experiments of a heated vertical aluminum plate with an embedded heater, in quiescent air, were conducted for the simultaneous estimation of total hemispherical emissivity and specific heat of the plate material. During cooling, the heat loss from the hot plate by natural convection and radiation was taken into account. During the experiments, plate temperatures were recorded at several locations using a data acquisition system. A numerically computed transient response of the plate is then compared with the experimentally known transient response to estimate the residual, the minimization of which using Levenberg-Marquardt's iterative procedure retrieves the parameters pertinent to the problem. The experiments were conducted for three different surface emissivities of the plate obtained by using suitable surface treatment. A consistency test for the present approach was also done by conducting transient heating experiments using the retrieved values of parameters and a comparison of simulated and calculated natural convection heat transfer coefficients as a function of temperature. The experiments have been performed over a temperature range of 320-430 K and a Ray-leigh number range of 2×10~6-2 ×10~7. The emissivity values are in good agreement with previous reported results.
机译：进行了一个带有嵌入式加热器的垂直铝板在静态空气中的瞬态冷却实验，以同时估算该板材料的总半球发射率和比热。在冷却过程中，考虑了自然对流和辐射导致的热板热量损失。在实验过程中，使用数据采集系统在多个位置记录了板温度。然后，将板的数值计算瞬态响应与实验已知的瞬态响应进行比较，以估计残差，使用Levenberg-Marquardt的迭代程序将其最小化，可以检索与问题相关的参数。对于通过使用适当的表面处理获得的板的三种不同的表面发射率进行了实验。通过使用参数的取回值进行瞬态加热实验，并根据温度对模拟和计算的自然对流传热系数进行比较，可以对本方法进行一致性测试。实验是在320-430 K的温度范围和2×10〜6-2×10〜7的瑞利数范围内进行的。发射率值与先前报告的结果非常吻合。

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