Numerical Simulation of Metal Droplet Break-up Behavior in Gas Atomization
The gas atomization is an important metal powder preparation technology,which has a wide powder size distribution leading to the issue that the production efficiency is relatively low.The metal powder size distribution is mainly affected by the melt droplet break-up process in the gas atomization.In the present work,a two-dimensional axisymmetric mathematical model at unsteady state,which takes a secondary break-up and solidification model into consideration,is developed.The results show that the high-pressure gas stream forms a supersonic jet,which rapidly expands in the radial and axial direction,after exiting nozzle.As the gas moves,the metal droplets gradually break up into the small-sized droplets.Although the size of metal droplet significantly decreases in the early stage of break-up process,the temperature and velocity of metal droplet almost remains stable.The metal droplet temperature reduces sharply and its velocity increases rapidly,only when the droplet size becomes small,followed by the solidification process.At the outlet,the metal droplets that initially had a size in the mm range are broken into μm-sized droplets.In addition,the median diameter of metal droplet at the outlet is about 56.7 μm,which is basically consistent with the production data.
Gas atomization Metal droplet Break-up Size distribution Mathematical model
Du Kaiping Li Zhengqiu Shen Jie Zhang Xin Ma Yao
BGRIMM Technology Group,Beijing 100160,China
国际会议
北京
英文
164-171
2018-09-16（万方平台首次上网日期，不代表论文的发表时间）