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Development of a New Method for Measuring Thermal Contact Resistance by Ultrasonic Waves

超声波测量接触热阻新方法的开发

基本信息

批准号：
07650262
负责人：
TOMIMURA Toshio
金额：
$ 1.15万
依托单位：
KYUSHU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1996
项目状态：
已结题

项目摘要

In the academic year 1995, a fundamental study was carried out to clarify the relation between the ultrasonic transmission characteristics through a contact interface of two metallic solids and the thermal contact conductance (or its reciprocal, the thermal contact resistance) by using brass soecimens. In the academic year 1996, the dependence of the thermal contact conductance on the heat flow direction, which is often called rectification, and the application ranges of the present method were mostly studied experimentally and theoretically. The main achievements of the project are concluded as follows :1.As a result of studying the dependence of the ultrasonic transmission through the interface on the mean nominal contact pressure for flat rough surfaces, it is clarified that the measurement of transmitted ultrasonic waves is effective for the estimation of the thermal contact conductance.2.In the case of wavy rough surfaces, an averged value over the nominal contact surface area is obtained for the mean thermal contact conductance h_m, while the transmitted sound energy depends on the size of the specific transducers.3.For flat rough surfaces, an empirical correlation expression h<@D2m@>D2, and the transmitted sound energy ratio is proposed. By using the expression, h<@D2m@>D2, can be presicted within an error of about (]SY.+-。[)50%.4.The rectification is confirmed in the present study. It is shown that the conductance h_m, is affected considerably by the temperature at the interface for such larger wavy surfaces as the present experiments.5.In the rectification experiments of the transmitted ultrasonic waves, the opposite dependence is observed, and it is suggested to take the temperature dependence of the transducers into account.

在1995学年，进行了一项基础研究，以澄清通过两种金属固体的接触界面的超声波传输特性和热接触传导（或其倒数，接触热阻）之间的关系，通过使用黄铜soecimens。在1996年的研究中，主要从实验和理论两个方面研究了接触热导率与热流方向的关系，即所谓的整流，以及本方法的应用范围。项目取得的主要成果如下：1.研究了超声在粗糙表面上的传播与平均名义接触压力的关系，阐明了测量超声传播对接触热导的有效性; 2.在波浪形粗糙表面上，平均接触热导h_m在名义接触面积上取平均值，而传播声能取决于特定传感器的尺寸; 3.在粗糙表面上，给出了经验关联式h<@D2m@>D2，并提出了透射声能比。利用该表达式，h<@D2m@>D2，可在±（±）SY的误差范围内给出。[)50 4.本研究证实了该修正。结果表明，对于像本实验这样的大波纹表面，界面温度对电导h_m有很大的影响。5.在对发射超声波的整流实验中，观察到相反的依赖关系，建议考虑换能器的温度依赖性。