在巨觀的情況下，將不同材料疊合會感覺其為完美接觸，但是在微觀情況下，不同材料接觸並不會形成完美接觸，是因為無論材料互相接觸的表面多光滑，其細看皆是粗糙不平的，一般而言，最簡單的研究方法是假設兩塊材料介面間為完美接觸，即溫度與熱通量在此介面為連續，但此假設與真實情況會有差異，而探討此兩塊材料介面間的微小空隙即為本文研究之重點，本文將利用數值模擬與實驗分析對上述之現象進行分析。
實驗方面，使用了純銅和純鋁作為實驗模型，並對其施加不同功率與壓力，來量測其內部的溫度變化，在分析方面，使用有限差分法，而在數值模擬方面，則利用COMSOL進行其溫度方面的觀察，觀察溫度變化對於接觸熱阻的影響、所施加的荷重是否會對於接觸熱阻造成影響，最後將數值模擬配合實驗所測量到的數據，利用逆運算法來逆運算無法量測的介面熱傳係數。

Two different materials are put together. From the macroscopic viewpoint, they intuitively seem to be perfect contact at the interface. However, from the microscopic one, they are not perfect contact because the contact surfaces are microscopically rough regardless of being macroscopically smooth. In general, the easiest assumption for the interface analysis is perfect contact, where the temperature and heat flux are continuous. However, the assumption deviates from the practical condition. To study the imperfect contact interface is the key point of the thesis. In the work, the numerical simulation and the experimental analysis are used to investigate the interfacial phenomenon. In the experimental study, copper and aluminium are used as the testing materials, input power and external pressure are utilized as the working parameters, and temperatures in these two materials are measured for the analyses. In the study, the finite difference is employed to inversely calculate the effective heat transfer coefficients at the interface by using the measured temperature data. COMSOL is used to analyse the temperature distribution after the coefficients are obtained. In the thesis, the effects of working parameters on the effective heat transfer coefficients and the corresponding temperature profiles are studied.

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