Numerical Simulation of the Stirring Action of Ultrasound in the Process of Semi-Continuous Casting Aluminum Alloy

Ju Zengye; Li Xiaoqian; Jiang Ripeng

doi:10.15980/j.tzzz.2012.11.022

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Numerical Simulation of the Stirring Action of Ultrasound in the Process of Semi-Continuous Casting Aluminum Alloy
Vol. 32, Issue 11, Pages: 1045-1048(2012)
Published： 2012 ，
DOI： 10.15980/j.tzzz.2012.11.022

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[1]鞠增业,李晓谦,蒋日鹏.超声在铝合金半连铸中搅拌作用的数值模拟[J].特种铸造及有色合金,2012,32(11):1045-1048.

Ju Zengye, Li Xiaoqian, Jiang Ripeng. Numerical Simulation of the Stirring Action of Ultrasound in the Process of Semi-Continuous Casting Aluminum Alloy. [J]. Special Casting & Nonferrous Alloys 32(11):1045-1048(2012)
[1]鞠增业,李晓谦,蒋日鹏.超声在铝合金半连铸中搅拌作用的数值模拟[J].特种铸造及有色合金,2012,32(11):1045-1048. DOI： 10.15980/j.tzzz.2012.11.022.

Ju Zengye, Li Xiaoqian, Jiang Ripeng. Numerical Simulation of the Stirring Action of Ultrasound in the Process of Semi-Continuous Casting Aluminum Alloy. [J]. Special Casting & Nonferrous Alloys 32(11):1045-1048(2012) DOI： 10.15980/j.tzzz.2012.11.022.

摘要

针对含有相变的铸造过程

推导出了郎之万辐射压力梯度的矢量表达式

建立了声场、流场和温度场的耦合模型

并应用COMSOL Multiphysics软件求解出了声波频率为20kHz时的液穴内熔体流动速度分布和温度分布。模拟结果表明

超声处理能使熔体流动大幅度加强

形成流动漩涡

极大地增强了传热、传质和晶核的弥散;超声振动降低了过渡区域在圆坯轴向的温度梯度

使等轴晶更易形成。

Abstract

For the process of casting accompanied by phase transformation

the vector expression of Langevin radiation pressure gradient was deduced

and the mathematical coupling model of ultrasound field

flow field and temperature field was established. Fluid velocity and temperature distribution were simulated by COMSOL Multiphysics software. The simulated results show that with ultrasonic vibration

melt flow is significantly enhanced

and large flow swirl occurs

which greatly enhance the heat and mass transfer as well as nucleation diffusion. Ultrasonic vibration considerably reduce the temperature gradient of the transition region in the axial direction of round billet

leading to easily forming equiaxed grains.