Numerical simulation during vacuum sublimation purification of metal Tm (Ⅱ): Effect of Operation Conditions
Two important operating parameters of heater temperature and the thickness of solid metal Tm has been considered, and the temperature distribution in the sublimation furnace has been simulated by a 2-D axis-symmetric heat transfer model.The simulation results indicate that, the temperature increases gradually in the solid metal and metallic vapor in the lower part of the crucible, reaches the maximum approximately in the middle of the crucible, and the temperature profiles are similar with various heater temperature;the mean temperature at upper surface of solid metal is about 30 ℃ lower than heater temperature in the beginning of sublimation purification process, the sublimation velocity calculated by simulation is lower than the value calculated by heater temperature, and the dimensionless ratio increases 54.3% to 83.3% with the heater temperature increasing;as the purification continues, the thickness of solid metal decreases correspondingly,the temperature difference of mean temperature at upper surface of solid metal to the heater temperature increases gradually, the maximum temperature difference is up to 98.4 ℃ when the heater temperature is 1400 ℃ and thickness is 10 mm;the temperature difference between the upper and lower surface of solid metal increases with the heater temperature increasing, and it decreases as the sublimation purification continues, it decreases the range of 2.1~5.3 ℃ when the thickness is 10 mm;the sublimation velocity calculated by simulation results is lower than that calculated by the heater temperature, and it further decreases with the sublimation purification.
sublimation purification numerical simulation meal Tm temperature field sublimation velocity
Xiao-wei ZHANG Qiong ZHU Rui-ying MIAO Dao-gao WU De-hong CHEN Zhi-qiang WANG Shi-hong YAN
National Engineering Research Center for Rare Earth Materials, General Research Institute for Nonferrous Metals, and Grirem Advanced Materials Co.LTD.,Beijing, 100088, PR China
国内会议
南宁
英文
78-84
2016-09-06（万方平台首次上网日期，不代表论文的发表时间）