Free convection heat transfer in thermal imaging processes

IF 4.9 2区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Thermal Sciences Pub Date : 2025-04-25 DOI:10.1016/j.ijthermalsci.2025.109957

Li Wang, Wenyi Xu, Ning Tao, Jiangang Sun

引用次数: 0

Abstract

Surface heat transfer may play an important role in quantitative thermal-imaging analyses of low thermal conductivity materials. This study is a first investigation into the estimation of this surface heat transfer characterized by a heat-transfer coefficient consisting of radiative and convective contributions with the convective component predicted by free convection theories. Because these theories are not derived under precise thermal-imaging conditions, their applications are evaluated by experimental measurements of the convective heat-transfer coefficient in step-, square-, and flash-heating thermal imaging processes. To achieve a better measurement accuracy, the experiments were conducted using low conductivity polymer plate samples under optimized thermal-imaging conditions. The coefficients were calculated using conventional thermal-imaging models based on a constant heat-transfer coefficient. The experimental results were compared with free-convection predictions and found in general agreement.

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热成像过程中的自由对流传热

表面传热在低导热材料的定量热成像分析中起着重要的作用。本文首次研究了这种表面传热的估计，其特征是传热系数由辐射和对流贡献组成，对流成分由自由对流理论预测。由于这些理论不是在精确的热成像条件下推导出来的，因此它们的应用是通过对阶梯、方形和闪热热成像过程中的对流传热系数的实验测量来评估的。为了获得更好的测量精度，在优化的热成像条件下，使用低电导率的聚合物板样品进行了实验。这些系数是使用基于恒定传热系数的传统热成像模型计算的。将实验结果与自由对流预测结果进行了比较，结果基本一致。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

International Journal of Thermal Sciences 工程技术-工程：机械

CiteScore

8.10

自引率

11.10%

发文量

531

审稿时长

55 days

期刊介绍： The International Journal of Thermal Sciences is a journal devoted to the publication of fundamental studies on the physics of transfer processes in general, with an emphasis on thermal aspects and also applied research on various processes, energy systems and the environment. Articles are published in English and French, and are subject to peer review. The fundamental subjects considered within the scope of the journal are: * Heat and relevant mass transfer at all scales (nano, micro and macro) and in all types of material (heterogeneous, composites, biological,...) and fluid flow * Forced, natural or mixed convection in reactive or non-reactive media * Single or multi–phase fluid flow with or without phase change * Near–and far–field radiative heat transfer * Combined modes of heat transfer in complex systems (for example, plasmas, biological, geological,...) * Multiscale modelling The applied research topics include: * Heat exchangers, heat pipes, cooling processes * Transport phenomena taking place in industrial processes (chemical, food and agricultural, metallurgical, space and aeronautical, automobile industries) * Nano–and micro–technology for energy, space, biosystems and devices * Heat transport analysis in advanced systems * Impact of energy–related processes on environment, and emerging energy systems The study of thermophysical properties of materials and fluids, thermal measurement techniques, inverse methods, and the developments of experimental methods are within the scope of the International Journal of Thermal Sciences which also covers the modelling, and numerical methods applied to thermal transfer.