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Fundamental radiative heat transfer analysis of a packed sphere system for powder applications

Authors Wu, Kai Chiu
Issue Date 1998
Summary One of the popular manufacturing process in industry is the rapid sintering, however, due to the limited time, there always exists thermal gradient inside. This thermal gradient has deterministic effect on the microstructure of the greenware and hence the quality of the final product. Therefore, in order to understand this complex process, the first step is study its heat transfer behavior. Since thermal radiation is the dominant mode of energy transport, it is important to understand its behavior. In this work, the greenware is modeled as a system of uniform sized packed sphere. The objective of this work is to develop the basis ground for computing the temperature solution. A non-statistical ray tracing scheme has been developed for studying different packed sphere system such as specular, diffuse and directional reflecting spheres. Also, an two-objective functions typed inversion scheme has been setup for accurately capture the system properties of the system. Due to the fact that the microstructure has direct effect on the final product's quality. In this study, it is also taken care. A random packing algorithm has been developed to study the microstructural behavior - the mean coordination number and the mean contact area, of the packed structure.
Note Thesis (M.Phil.)--Hong Kong University of Science and Technology, 1998
Language English
Format Thesis
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