堵塞
喷嘴
粘度
钢包
真空感应熔炼
材料科学
熔体流动指数
流体体积法
管(容器)
湍流
冶金
化学
流量(数学)
复合材料
机械
合金
机械工程
工程类
物理
共聚物
考古
历史
聚合物
作者
Junfeng Wang,Min Xia,Jialun Wu,Changchun Ge
标识
DOI:10.1007/s11663-022-02537-y
摘要
During the production of fine metal powder using vacuum induction melting gas atomization (VIGA) technology, the problem of nozzle clogging is often encountered. The viscosity of melt is one of the key factors causing the clogging of nozzle. To visualize the mechanism of the clogging of nozzle, the volume of fluid (VOF) model combined with large eddy turbulence model was used to simulate the nozzle-clogging process of an alloy melt in the primary atomization zone. The results show that, with the increase of viscosity, the flow rate of the melt in the delivery-tube decreased, the heat dissipation of the melt increased, and the crushing resistance increased. In addition, the melt flow that was not broken in time hanged at the tip of the delivery-tube, and resulted in nozzle-clogging. The simulation results were also verified by the gas atomization experiments. When the viscosity of the melt was 5.24–5.45 mPa s, the atomization process was continuous, the particle size distribution was uniform, and the yield of fine powder was high. However, when the viscosity continued to decrease, a larger mass flow rate had the opposite effect, and the powder particles became coarser. This research is of guiding significance for understanding the continuity of atomization process of VIGA technology.
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