Modeling thermal contact resistance at the finger-object interface
Modeling thermal contact resistance at the finger-object interface
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DOI：
10.1080/23328940.2018.1551706
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发表时间：
2018-12
期刊：
影响因子：
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通讯作者：
K. Rykaczewski
中科院分区：
文献类型：
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作者：
K. Rykaczewski
手指-物体界面处的接触热阻在我们的热感知中起着重要作用，并且是无数电子和热设备设计的重要参数。目前，它的价值是通过实验测量的，或者更常见的是使用半经验模型估计的。该模型由库珀、米克和约万诺维奇（CMY）在20世纪60年代开发，用于预测真空中金属-金属界面的接触电阻。在这项工作中，它表明，手指-物体接触电阻的测量值是更好地预测由Prasher和Matayabas（PM），这是通过拟合接触电阻数据的硅凝胶-金属表面界面在微电子应用中开发的一个最近的相关性。此外，它表明，经验PM相关性的函数形式，可以推导出使用手指固体接触场景的尺度分析，因此可以被认为是一个基于物理的模型。比较两个模型对两个先前公布的实验数据集表明，PM模型预测手指和各种材料之间的热阻在很宽的接触压力范围。具体地，对于与包括铝、BaF 2晶体和大理石的显著更导电的材料（热导率高于1 Wm-1 K-1）的手指接触，可以获得接触电阻的良好预测。对于与导热性较差的材料（如木材）接触的皮肤，两种模型对基材的导热率值都变得高度敏感，并且仅提供一个数量级的估计。这些结果的主要影响和相关的悬而未决的问题也进行了简要的讨论。
ABSTRACT Thermal contact resistance at the finger-object interface plays a significant role in our thermal perception and is an important parameter for the design of a myriad of electronics and thermal devices. Currently, its value is measured experimentally or, more commonly, is estimated using a semi-empirical model. This model was developed by Cooper, Mikic, and Yovanovich (CMY) in the 1960s for predicting contact resistance of metal-metal interfaces in a vacuum. In this work, it is shown that measured value of finger-object contact resistance is better predicted by a more recent correlation by Prasher and Matayabas (PM) that was developed by fitting contact resistance data for silicone gel-metal surface interfaces in microelectronic applications. Furthermore, it is show that the functional form of the empirical PM correlation can be derived using scale analysis of the finger-solid contact scenario, consequently can be considered a physics-based model. Comparing the two models against two previously published experimental data sets demonstrates that the PM model predicts well the thermal resistance between finger and variety of materials over a wide range of contact pressures. Specifically, for finger contact with significantly more conductive materials (thermal conductivity above 1 Wm−1K−1) including aluminum, BaF2 crystal, and marble a good prediction of contact resistance can be attained. For skin contact with less conductive materials, such as wood, both models become highly sensitive to the substrate’s thermal conductivity value and provide only an order of magnitude estimate. The main implications of these results and relevant outstanding questions are also briefly discussed.