| Summary: | 碩士 === 國立成功大學 === 機械工程學系碩博士班 === 91 === The object of this thesis is to study the solidification phenomena of carbon steel particles in laser vaporization with shock wave effects. The problem was solved by numerical simulation and experimental observation.
The aspects of the numerical analysis include the particle velocity, flow pressure and particle temperature in the flow field. Using the computational fluid dynamics (CFD) software, FLUENT, the compressible flow problem with turbulence was solved. With the mathematical models formulating the solidification processes of the particle-gas interactions in flight, the heat transfer problem was solved. Furthermore, the effects of compressible flow on metal particle temperature and velocity were also considered. The proposed model can be used to predict the carbon steel particles in the size range of 1-150μm.
The effects of process parameters on the solidification of carbon-steel particle were investigated, the experiments including the flow visualization by shadowgraph method, the generation of metal particle with Nd-YAG laser and the measurement of particle velocity were proposed to verify the numerical results. This research is a fundamental study for the future research on the generation of nanometer particle with pulsed laser radiation and shock wave interference.
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