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首页> 外文期刊>Experimental Heat Transfer >EXPERIMENTAL IDENTIFICATION OF THERMOPHYSICAL PROPERTIES IN HETEROGENEOUS MATERIALS WITH INTEGRAL TRANSFORMATION OF TEMPERATURE MEASUREMENTS FROM INFRARED THERMOGRAPHY
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EXPERIMENTAL IDENTIFICATION OF THERMOPHYSICAL PROPERTIES IN HETEROGENEOUS MATERIALS WITH INTEGRAL TRANSFORMATION OF TEMPERATURE MEASUREMENTS FROM INFRARED THERMOGRAPHY

机译：红外热像仪对温度测量值进行整体转化的异质材料热物理性质的实验鉴定

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摘要

This work deals with the experimental estimation of spatially variable thermal conductivity and diffusivity in heterogeneous media, with temperature measurements obtained via infrared thermography being used in the inverse analysis. The direct problem solution for a one-dimensional heat conduction experiment is analytically obtained via integral transforms, and the related eigenvalue problem is solved by the generalized integral transform technique. The inverse problem is handled by Bayesian inference through a Markov chain Monte Carlo algorithm. The functional representation and estimation is based on the eigenfunction expansion of the thermal conductivity and diffusivity themselves, and the unknown parameters become the corresponding expansion coefficients. The inverse analysis is performed on the transformed experimental temperature field instead of employing the actual local temperature measurements, thus promoting a significant data reduction through the integral transformation of the experimental measurements. A demonstration experiment is built involving partially heated thin plates made of bake-lite and polystyrene, including a variable thickness plate to simulate spatially variable thermophysical properties.
机译：这项工作涉及在非均质介质中对空间可变的热导率和扩散率进行实验估算，并将通过红外热成像法获得的温度测量值用于反分析。通过积分变换解析得到一维导热实验的直接问题解，并通过广义积分变换技术解决了相关的特征值问题。通过马尔可夫链蒙特卡洛算法通过贝叶斯推理处理反问题。功能表示和估计基于导热系数和扩散系数本身的本征函数展开，未知参数成为相应的展开系数。反演是在转换后的实验温度场上执行的，而不是使用实际的局部温度测量值，从而通过对实验测量值进行整体转换来促进数据的显着减少。建立了一个演示实验，涉及由电木和聚苯乙烯制成的部分加热的薄板，其中包括一块厚度可变的板，以模拟空间可变的热物理性质。

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  • 来源
    《Experimental Heat Transfer》 |2013年第5期|1-25|共25页
  • 作者

    Diego C. Knupp; Carolina P. Naveira-Cotta; Helcio R. B. Orlande; Renato M. Cotta;

  • 作者单位

    Laboratory of Transmission and Technology of Heat (LTTC),Mechanical Engineering Department - POLI and COPPE,Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil;

    Laboratory of Transmission and Technology of Heat (LTTC),Mechanical Engineering Department - POLI and COPPE,Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil;

    Laboratory of Transmission and Technology of Heat (LTTC),Mechanical Engineering Department - POLI and COPPE,Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil;

    Laboratory of Transmission and Technology of Heat (LTTC),Mechanical Engineering Department - POLI and COPPE,Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil Mechanical Engineering Department, PEM/COPPE - UFRJ - Cx. Postal 68503, Cidade Universitaria, Rio de Janeiro, 21945-970 Brazil;

  • 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
  • 关键词

    heterogeneous media; inverse problem; Bayesian inference; Markov chain Monte Carlo method; integral transforms; infrared thermography;

    机译：异构媒体反问题贝叶斯推理;马尔可夫链蒙特卡罗方法;积分变换红外热成像;

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