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Thermal and fluid flow effects on bubble growth at a solidification frontWu, Ming-chang 30 August 2012 (has links)
The study applies the phase-field method to simulate the behavior between bubble and liquid-solid front in the solidification. During the process, the two-phase flow module is used to match up with temperature and phase-field function to determine the percentage of- solid, liquid, and gas- in the domain. The governing equations for mass, momentum and energy contain coefficients which are related to percentage of phases.The result show that the surface tension and the temperature difference will influence the shape of bubble and the velocity of solidification.
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FUNDAMENTAL STUDY ON UNDULAR AND DISCONTINUOUS HYDRAULIC JUMPS BY MEANS OF ASIMPLIFIED MOMENTUM EQUATION / 簡易型運動量方程式を用いた波状跳水及び不連続跳水に関する基礎的研究THIN, THWE THWE 23 September 2020 (has links)
京都大学 / 0048 / 新制・課程博士 / 博士(工学) / 甲第22756号 / 工博第4755号 / 新制||工||1744(附属図書館) / 京都大学大学院工学研究科都市社会工学専攻 / (主査)教授 細田 尚, 教授 戸田 圭一, 准教授 音田 慎一郎 / 学位規則第4条第1項該当 / Doctor of Philosophy (Engineering) / Kyoto University / DFAM
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The free surface deformation affected by two-dimensional thermocapillary flow irradiated by energy fluxShi, Zong-You 30 August 2012 (has links)
This study focuses ontransient heat flow behavior in which centralizing energy on themetal makes metal surface come to aheat molten state with centralized heat source .
This flow field is two-dimensional transient model, using Phase-field method and Two-phase flow to simulatemetal surface. In this study is under considerations of the mass conservation equation, momentum equation, energy equation and the level-set equation, regardless of the impact due to the concentration diffusion. At last it will show the flow of the molten zone caused by temperature, and the flows in molten zone forced by thermocapillary which is caused byvariation of temperature.
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