Development of differential thermal resistance method for thermal conductivity measurement down to microscale
Development of differential thermal resistance method for thermal conductivity measurement down to microscale
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DOI：
10.1016/j.ijheatmasstransfer.2022.123712
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发表时间：
2023-03
影响因子：
5.2
通讯作者：
Mahya Rahbar;Meng Han;Shen Xu;Hamidreza Zobeiri;Xinwei Wang
中科院分区：
文献类型：
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作者：
Mahya Rahbar;Meng Han;Shen Xu;Hamidreza Zobeiri;Xinwei Wang
材料的热导率（k）在工程领域中对设备的有效性起着关键作用。在这项工作中，一种新的差分热阻（DTR）方法被开发用于测量毫米至微米厚的样品的面外和面内。传统的直接测量技术通常需要测量样品上的传热和温差。DTR技术而是构造参考样品和感兴趣的样品的配置，以测量温升并确定样品的热阻和它本身。采用激光非接触加热和高灵敏度红外摄像机热探测。1.49和2.81 mm厚的丙烯酸样品和1 mm厚的载玻片的面外k分别为0.20、0.19和1.27 W·m-1·K-1。一张26 μ m厚的石墨烯纸的面内能量为616 W·m-1·K-1。我们的测量结果和参考值之间获得了良好的一致性。15 μ m厚纯铜箔的面内电阻为322 W·m-1·K-1，与纯铜的密度调整值326 W·m-1·K-1非常吻合。此外，通过测量铜线圈的电导率，我们能够确定其洛伦兹数为（2.21-2.30）× 10− 8 W·Ω·K− 2，与参考值（2.23-2.33）× 10− 8 W·Ω·K−2非常一致。
The thermal conductivity (k) of materials plays a critical role in the effectiveness of devices in the engineering fields. In this work, a novel differential thermal resistance (DTR) method is developed to measure the out-of-plane and in-planekof mm- down to μm-thick samples. Traditional techniques for directkmeasurement usually needs measuring the heat transfer and temperature difference across the sample. The DTR technique rather constructs configurations for reference samples and sample of interest to measure the temperature rise and determine the thermal resistance of the sample and itsk. Non-contact heating by laser and thermal probing by a high-sensitivity infrared camera are employed. The out-of-planekof 1.49 and 2.81 mm-thick acrylic samples, and 1 mm-thick glass slide is measured to be 0.20, 0.19, and 1.27 W·m−1·K−1, respectively. The in-planekof a 26 μm-thick graphene paper is measured to be 616 W·m−1·K−1. A good level of agreement is obtained between our measurement results and reference values. Moreover, the in-planekof 15 μm-thick pure copper foil is measured to be 322 W·m−1·K−1, very well agreeing with the density-adjusted value of 326 W·m−1·K−1for pure copper. Also by measuring the copper coil's electrical conductivity, we are able to determine its Lorenz number as (2.21-2.30) × 10−8W·Ω·K−2which agrees well with reference values of (2.23-2.33) × 10−8W·Ω·K−2.