Micro- and Micro-scopic Approach to Transport Phenomena of Heat and Radiation among Real Surfaces

热工系统中的真实的表面与实验室中干净的光学光滑表面有很大的不同。表面具有微观粗糙度，并且在大多数情况下它们被任何表面膜覆盖。这种表面上的现象在两个工程科学问题中是重要的：第一，固体-固体界面上的接触热阻，第二，热辐射特性和光学表面诊断。在上述方面，我们处理了以下四个主题。首先，我们追求一种从外部诊断固-固界面上的接触热阻的原位技术，因为接触界面的微观结构取决于所施加的压力和晶体结构的变形而随时间变化。本文将超声波裂纹探测技术应用于接触电阻问题，对超声波在金属-金属接触界面上的反射和界面热传导进行了宏观实验，并对超声波在金属-金属接触界面上的反射和热传导进行了宏观实验。 ...更多信息 通过有限大小的原子柱，模拟固-固接触点的不均匀热能流的分子动力学微观研究。这种研究是接触热阻微观机理研究的基本单元。结果表明，在一个有限大小的原子的微通道，在那里的通道的表面的影响是有效的，热能不均匀流动，但流动更多的通道的中心部分。第三，我们扩展了我们的高速光谱研究工业环境中的真实的表面的热辐射特性。我们改进了我们的分光光度计系统，在一个系统中同时重复测量从可见光到红外的宽光谱范围内的反射和发射光谱。我们应用该实验系统的金属表面的氧化过程中的辐射特性的调查。第四，对粗糙金属表面的辐射反射方向特性进行了实验研究，并对辐射传热参数进行了评价，为辐射传热评价和光学表面诊断技术的发展做出了贡献。少

Real surfaces in thermal engineering systems are far different from clean optically smooth surfaces in laboratories. The surfaces have microscopic roughness and they are covered by any surface films in most cases. Phenomena on such surfaces are important in two engineering science problems : first, thermal contact resistance on solid-solid interface, and second, thermal radiation characteristics and optical surface diagnosis. On the above aspect, we dealt with the following four subjects.First, we pursue 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. We applied a ultrasonic wave technique for crack-search to our contact resistance problemWe conducted macroscopic experiments on ultrasonic wave reflection on a metal-metal contact interface and heat transmission through the interface.Second, we made … More a microscopic study of molecular dynamics on inhomogeneous thermal energy flow through a finite-size atom column, which simulates a solid-solid contact point. 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 central part of the channel.Third, we extended our high-speed spectroscopy for investigating thermal radiation characteristics of real surfaces in industrial environments. We improved our spectrophotometer system which measures reflection and emission spectra simultaneously and repeatedly over a wide spectral region from visible to infrared in one system. We applied the experimental system to the investigation of radiation characteristics of metal surfaces in an oxidation process. And, we proposed an algorithm for diagnosing the surface temperature and surface microstructure of a metal.Fourth, we investigated experimentally on directional characteristics of radiation reflection on rough metal surfaces with evaluation of radiation heat transfer parameters which contributes the study for the radiative transfer evaluation and that for the development in an optical surface diagnosis technique. Less