Thermophysical and Elastic Wave Theory Approach to Thermal Contact Resistance of Solid Surfaces

材料表面接触热阻是热工领域工业设备热设计的重要因素之一。因此，有必要在热物理和弹性波理论的基础上，对接触热阻的物理机制进行深入的研究。同时，还需要研究一种过程中技术来诊断/评估固体表面的接触热阻，该热阻随时间而变化。在本研究中，我们从这个角度进行了以下三项研究。第一，我们追求一个现场技术，从外部诊断的热接触电阻的固-固界面。由于接触界面的微观结构随着时间的变化取决于所施加的压力和晶体结构的变形，因此重要的是开发一种用于评估接触状态的方法。在这项研究中，我们应用超声波技术的裂纹搜索我们的热接触电阻， ...更多信息 CE问题。对超声波在金属-金属接触界面上的反射和界面传热进行了宏观实验。其次，我们研究了超声波的反射和透射特性的界面上的介质的弹性波理论。即用弹性波理论描述了脉冲超声波/弹性波或波包的传播与识别、界面反射、界面透射和超声波的衍射现象，完成了反演分析系统。对超声波在光滑表面和系统粗糙表面上的反射和透射特性进行了基础实验，验证了分析系统的能力。第三，我们对有限尺寸原子柱中非均匀热能流的分子动力学进行了微观研究。这种研究是接触热阻微观机理研究的基本单元。结果表明，在一个有限尺寸的原子的微通道，其中的通道的表面的影响是有效的，热能不均匀流动，但更多地在通道的中心部分流动，它是热接触电阻的主要因素之一。少

Thermal contact resistance of solid surfaces of materials is one of the most important factors in thermal design of industrial devices in thermal engineering. It is necessary to develop a fundamental study to clarify physical mechanism of thermal contact resistance on bases of thermophysical and elastic wave theory. At the same time, it is also necessary to study an in-process technique to diagnose/ evaluate thermal contact resistance of solid surfaces, which changes from time to time. In this study, we performed the following three studies from this point of view.First, we pursued an in-situ technique for diagnosing the thermal contact resistance on a solid-solid interface from outside. Since microstructure of the contact interface changes with time depending on applied pressure and deformation in crystal structure, it is important to develop an method for evaluating contact states. In this study, we applied an ultrasonic wave technique for crack-search to our thermal contact resistan … More ce problem. We made macroscopic experiments on ultrasonic wave reflection on a metal-metal contact interface and heat transmission through the interface. Second, we investigated ultrasonic wave reflection and transmission characteristics at an interface of media by an elastic wave theory. That is, we described propagation and distinction of pulse ultrasonic/ elastic wave or wave packet, interface reflection, interface transmission and diffraction phenomena of ultrasonic wave by an elastic wave theory and completed the inversion analysis system. We made basic experiments on ultrasonic wave reflection and transmission characteristics on smooth and systematically rough surfaces, and confirmed the ability of the analysis system. Third, we made a microscopic study of molecular dynamics on inhomogeneous thermal energy flow through a finite-size atom column. Such a study must be an elementary unit of a study on micromechanism of thermal contact resistance. It was demonstrated that in a micro-channel of atoms of a finite size, where influence of the surface of the channel is effective, thermal energy does not flow homogeneously but flows more in the center part of the channel and that it is one of the main factors of thermal contact resistance. Less