Planar distribution measurement of cross-plane thermal diffusivity for microscale films using laser spot periodic heating technique

IF 4.9 2区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Thermal Sciences Pub Date : 2025-01-13 DOI:10.1016/j.ijthermalsci.2025.109692

Yanhui Zhang , Rui Xu , Tiantian Zhang , Jie Yang , Yi Liu , Yingjun Liu , Jianli Wang

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引用次数: 0

Abstract

Thin-film materials are widely used in the field of thermal management, but the characterization of their thermophysical properties on the microscale is still challenging. In this work, the planar distribution of the cross-plane thermal diffusivity for microscale films is measured utilizing the location-variation and frequency-variation methods based on a laser spot periodic heating technique. A laser beam is focused on the film surface for periodic heating, while a thermocouple collects the temperature rise signal from the back surface. The in-plane thermal diffusivity is determined employing the phase lag spatial distribution of the temperature rise. The cross-plane thermal diffusivity is derived after correcting the frequency dependence of phase lag using the bias phase, thereby eliminating the effect of thermal contact resistance at the thermocouple junction. The accuracy of this method is verified by measuring the thermal diffusivity of standard anisotropic polyester and isotropic stainless-steel films. Finally, the planar distribution of cross-plane thermal diffusivity of microscale stainless-steel and reduced graphene oxide films are successfully measured, bridging the gap left by the infrared lock-in thermography technique.

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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.