Modelling electromagnetically levitated liquid droplet oscillations
Modelling electromagnetically levitated liquid droplet oscillations
复制标题
DOI：
10.2355/isijinternational.43.890
复制
发表时间：
2003-01-01
影响因子：
1.8
通讯作者：
Pericleous, K
中科院分区：
文献类型：
--
作者：
Bojarevics, V;Pericleous, K
这项工作包括精确的计算分析悬浮液滴振荡在交流和直流磁场。交流磁场与液态金属液滴内的感应电流相互作用，产生强烈的流体流动和耦合的自由表面振荡。采用拟谱方法求解轴对称流体体积连续动力变换的湍流方程。体积电磁力分布随着形状和位置的变化而更新。我们开始与理想流体的测试情况下，无阻尼的瑞利频率振荡的重力，然后添加粘性和直流磁场阻尼。进一步分析了液滴在不同组合的交流和直流磁场中反重力悬浮的振荡频谱。在极端情况下，导电不良，抗磁性液滴（水）悬浮动力学进行了模拟。应用的目的是纯电磁材料加工技术和在无污染条件下的材料性能测量。
This work comprises accurate computational analysis of levitated liquid droplet oscillations in AC and DC magnetic fields. The AC magnetic field interacting with the induced electric current within the liquid metal droplet generates intense fluid flow and the coupled free surface oscillations. The pseudo-spectral technique is used to solve the turbulent fluid flow equations for the continuously dynamically transformed axisymmetric fluid volume. The volume electromagnetic force distribution is updated with the shape and position change. We start with the ideal fluid test case for undamped Rayleigh frequency oscillations in the absence of gravity, and then add the viscous and the DC magnetic field damping. The oscillation frequency spectra are further analysed for droplets levitated against gravity in AC and DC magnetic fields at various combinations. In the extreme case electrically poorly conducting, diamagnetic droplet (water) levitation dynamics are simulated. Applications are aimed at pure electromagnetic material processing techniques and the material properties measurements in uncontaminated conditions.