Analytical developments and experimental validation of a thermocouple model through an experimentally acquired impulse response function
Analytical developments and experimental validation of a thermocouple model through an experimentally acquired impulse response function
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DOI：
10.1016/j.ijheatmasstransfer.2019.05.098
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发表时间：
2019-10-01
影响因子：
5.2
通讯作者：
Chen, Hongchu
中科院分区：
文献类型：
--
作者：
Frankel, J., I;Chen, Hongchu
本文论述了理解热脉冲响应函数的意义和必要性，以(1)验证现场热电偶模型；(2)形成“无参数”的逆热传导方法。前者的应用是本研究的重点，但显而易见的是，如何将本说明的结果应用于后一种情况。本研究的实验部分利用一种新的小样本、高精度的电加热测试设备来产生可量化和准确的热流源。提取了探测点的脉冲响应核，并用于验证所提出的深度热电偶模型。根据探头的取向和有限的测试温度范围，建立了一阶线性热电偶模型。热电偶的位置和时间常数是通过一些独立的方法或实验来假定的。确定了脉冲响应函数，并将其与使用一阶模型得到的热方程的解的核进行了比较。如果模型没有物理缺陷，这两个内核应该几乎是重复的。这一初步研究为(1)重建脉冲响应函数和(2)验证热电偶模型提供了一种新的方法。此外，这种实验产生的脉冲函数可用于求解热传导反问题。(C)2019爱思唯尔有限公司。保留所有权利。
This paper addresses the significance of and need for understanding the thermal impulse response function for (1) validating in-situ thermocouple models; and, (2) forming a "parameter free" inverse heat conduction methodology. The former application is the focus of the present study but it will be evident how to implement the findings of this presentation into the latter situation. The experimental component of this study utilizes a new small-sample, high-accuracy, electrical heating test facility for producing a quantifiable and accurate heat flux source. The impulse response kernel at the probe site is extracted and used for verifying the proposed in-depth thermocouple model. A linear, first-order thermocouple model is proposed based on the orientation of the probe and limited test temperature range. The location of the thermocouple and time constant are assumed known from some independent means or experiments. The impulse response function is determined and compared with the kernel of the resulting solution of the heat equation using the first-order model. Both kernels should nearly replicate if the model is not physically deficient. This preliminary investigation demonstrates a new means for (1) reconstructing the impulse response function and (2) validating a thermocouple model. Further, this experimentally generated impulse function can be used for resolving inverse heat conduction problems. (C) 2019 Elsevier Ltd. All rights reserved.