Study on the Dynamic Thermal Contact Resistance and Its Evaluation

动态接触热阻的研究及其评价

基本信息

批准号：
12650195
负责人：
TORII Kahoru
金额：
$ 2.56万
依托单位：
Yokohama National University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2001
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12650195/
关键词：
Heat Conduction Thermal Contact Resistance Dynamic Thermal Resistance Transient Method Numerical Analysis Constriction Resistance Rarefied Gas Effect 最適化ニューラルネットワーク

项目摘要

This study aims at understanding the physical mechanisms of dynamic thermal contact resistance (TCR) of cylindrical surfaces in rolling contact. As a first step to clarifying this complex phenomenon, the TCR of statically-contacting cylindrical surfaces has been investigated in detail. A transient method for the evaluation of TCR is developed with a view to applying it to the dynamic case. The technique is used to estimate the value of TCR for rollers made of either steel (S45C) or aluminum alloy (A6061). A series of experimental and computation evaluations is made for TCR of contacting rolls, whose dimension is 60 mm in diameter and 180 in length, under the loading conditions of 10-120 kgf(98-1 1 80 N). The conclusions gained by the present study are summarized as follows :(1) The total TCR measured and estimated decreases with load applied to the rollers.(2) Microscopic constriction resistance at a contact line becomes negligible for the load larger than 20 kgf under the present cond … More itions. Instead, macroscopic constriction resistance due to the heat flow's converging to the contact line becomes dominant in overall TCR.(3) This macroscopic constriction resistance is dependent on the width of the contact line. The width is estimated to be about 1.4-2.4 mes, the value given by the Hertz theory of elastic contact. This discrepancy is likely due to the roughness present on the surfaces.(4) The conduction heat transfer through the air present between the contacting surfaces has an important contribution to the overall heat transfer. The consideration of the rarefied gas effect is also important for very thin air layer near the contact line(5) The effect of heat capacity of the contact resistance layer responsible for the microscopic constriction resistance can be neglected.This suggests that the overall dynamic TCR of cylindrical surfaces in rolling contact may be evaluated from the static microscopic TCR plus the dynamic macroscopic TCR, the latter can be predicted numerically by conventional computational methods. Less

这项研究旨在了解滚动接触中圆柱体表面动态热接触电阻（TCR）的物理机制。为了阐明这种复杂现象的第一步，已经详细研究了静态接触圆柱体表面的TCR。开发了用于评估TCR的瞬态方法，以将其应用于动态情况。该技术用于估计由钢（S45C）或铝合金（A6061）制成的滚筒的TCR值。在10-120 kgf（98-1 1 80 N）的负载条件下，对接触卷的TCR进行了一系列实验和计算评估，其直径为60 mm，长度为180。本研究得出的结论总结如下：（1）通过将负载施加到卷中，测量和估计下降的总TCR。（2）接触线处的显微镜收缩阻力可以忽略于在本频道下大于20 kgf的负载。取而代之的是，由于热流与接触线的融合导致的宏观收缩阻力在整体TCR中占主导地位。（3）这种宏观收缩电阻取决于接触线的宽度。宽度估计约为1.4-2.4 ME，是赫尔茨弹性接触理论给出的值。这种差异可能是由于表面上存在的粗糙度所致。（4）通过接触表面之间存在的空气传播传热对整体热传递具有重要贡献。 The consideration of the rarefied gas effect is also important for very thin air layer near the contact line(5) The effect of heat capacity of the contact resistance layer responsible for the microscopic constriction resistance can be neglected.This suggests that the overall dynamic TCR of cylindrical surfaces in rolling contact may be evaluated from the static microscopic TCR plus the dynamic macroscopic TCR, the latter can be predicted numerically by conventional computational 方法。较少的