| Summary: | 碩士 === 國立高雄應用科技大學 === 機械與精密工程研究所 === 97 === The purpose of this paper is to numerically analyze the cooling and thermal diffusion in a high-speed spindle with helical water cooling chamber. This research uses computational fluid dynamics (CFD) method to simulate the steady-state heat transfer. Simulation software Gambit is used in establishing the model of high-speed spindle with helical water cooling chamber and the grid setting. The achievement of numerical simulation analysis is used in computational fluid dynamics (CFD) software package Fluent. With appropriate boundary conditions, the cooling water has temperature at 293 K, and Kerosene has temperature at 288.6 K. The coolant is at velocity of 0.297 m/s, 0.475 m/s and 0.95 m/s. The spindle is made of SUS405 with thermal conductivity k = 16.3W/m-K. The spindle starts running at temperature of 290 K. The system considered is solved using CFD (Computational Fluid Dynamics) method. The SIMPLE scheme (Semi - Implicit Method for Pressure Linked Equation) is adopted for computation in the numerical procedure in a personal computer. The main impacts on spindle thermal diffusion discussed are heat flux, heat generation rate, forced convection heat transfer coefficient, and the related material parameters. Under the assumption of laminar flow for coolant, the thermal response of the spindle is investigated when it is fixed at three kinds of heat source (60W, 120 W, 250W) and the various flow rate of coolant.
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