Experimental investigation of low-frequency pulsed Lorentz force influence on the motion of Galinstan melt

Experimental investigation of low-frequency pulsed Lorentz force influence on the motion of Galinstan melt
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低频脉冲洛伦兹力对加林斯坦熔体运动影响的实验研究

DOI:
10.1016/j.spjpm.2016.08.002
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发表时间:
2016
期刊:
St. Petersburg Polytechnical University Journal: Physics and Mathematics
影响因子:
--
通讯作者:
Musaeva
Musaeva
中科院分区:
--
文献类型:
--
作者:
Musaeva

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本文给出了电磁场脉冲力对熔体运动和流体速度影响的数值和物理实验结果。采用超声多普勒测速仪对共晶合金Galinstan在圆柱体中进行了脉冲和稳态电磁场作用下的速度测量。对恒定电磁场作用下的熔体流动进行了数值模拟,采用二维轴对称模型。采用k-ε湍流模型获得熔体速度信息。对定常情况下的数值模型进行了验证。通过物理实验,比较了脉冲和稳定施加洛伦兹力的效果。在伽林斯坦,在0.05至1赫兹的脉冲频率范围内,速度脉动的强度远远超过在永久搅拌熔体中测得的值。对于较高的脉冲频率值(从1到10赫兹),效应减小,并且与永久施加的洛伦兹力的影响仅略有不同。
The paper presents the results of the numerical and physical experiments, aimed at assessing the influence of pulsed force of electromagnetic field on the melt motion and the fluid velocities. The experiment was performed on the eutectic alloy Galinstan in the cylindrical volume, where an ultrasonic Doppler velocimeter was employed for velocity measurements under conditions of pulsed and steady EM field application. A numerical simulation of the melt flow, forced by the steady EM force, involved a 2D axisymmetric model. Thek-ε turbulence model was used to obtain the information about the melt velocities. The verification of the numerical model was carried out for the steady case. The effects of pulsed and steadily applied Lorentz force were compared using the physical experiment. An intensity of the velocity pulsations in Galinstan for the pulsed frequencies in the range from 0.05 to 1 Hz considerably exceeded the values measured in the permanently stirred melt. For higher values of pulsed frequencies (from 1 to 10 Hz) the effect decreases and only slightly differs from the influence of the permanently applied Lorentz force.
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