Experimental and Numerical Analysis on Interfacial Heat Transfer between Two Different Materials

• Main Authors: Jheng-Si Su, 蘇正熹
• Other Authors: Long-Sun Chao
• Format: Others
• Language: zh-TW
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/65766646254109564250

碩士 === 國立成功大學 === 工程科學系碩博士班 === 97 === The heat-transfer analysis at the interface of two different materials is the key point of this work. Generally, the simplest way to deal with the interfacial heat transfer is to assume it is perfect contact at the interface between these two materials. However, this assumption deviates from the real situation. In the practical condition, though the contact surfaces of these two materials are very smooth from macro view, they are rough from micro one, which result in thermal contact resistance. Accordingly, the numerical and experimental methods are used to analyze the interfacial heat transfer phenomenon in this paper. In the numerical study, finite difference and finite element methods are utilized. From the computing results, these two methods have their own advantages and disadvantages. In the experimental analysis, pure iron and copper are used as the testing materials. During the heat transfer experiment, different powers and pressures are applied to the materials and the internal temperatures are measured. With the temperature-measure data, the inverse method, including the least square scheme and the future temperature concept, is applied to compute the interfacial heat transfer coefficient. From the results, it can be found that the power effect on interfacial heat transfer coefficient is more significant than the pressure one. With these interfacial heat transfer coefficients, the computed temperature profiles agree well with the experimental ones.