振动激发金属液形核结壳过程的数值模拟

Numerical Simulation of Nucleation and Crusting Process of Liquid Metal Excited by Vibration

振动激发金属液形核技术可以有效提高铁素体不锈钢熔体中的等轴晶率,但由于其自身的激冷作用易在晶核发射器的表面形成结壳,致使该技术失效。为解决该缺陷,本文通过FLUENT软件模拟该技术在600、700、800Hz三种振动频率下对结壳的影响。结果表明,600、700、800 Hz三种频率下在垂直于振动方向的结壳时间分别为8.120、9.020、9.620 s。增大振动频率可以延长结壳时间,三种频率中800 Hz为最佳振动频率。

The vibration-induced liquid metal nuclear technique can effectively increase the equiaxed crystal rate in the molten ferrite stainless steel, however, it is easy to form crusts on the surface of the nuclear emitter due to its own cooling effect, which results in the failure of the technology. In order to solve the defects, the effects of vibration-excited liquid metal nuclear technique on the crusting under three vibration frequencies(600, 700, 800 Hz) were simulated by using FLUENT software. The results show that the crusting time of the position under the three frequencies of 600, 700, 800 Hz perpendicular to the vibration direction is 8.120,9.020,9.620 s respectively. Increasing the vibration frequency can extend the time of crusting. 800 Hz is the best vibration frequency among the three frequencies.