Numerical Simulation of Droplet Dynamics under Electric Field Based on SPH Method
摘 要
建立了适用于电场作用下液滴动力学的光滑粒子流体动力学(SPH)模型,并验证了模型的准确性。运用此模型研究了电场强度对液滴聚并时间的影响。结果表明:电场强度增加,液滴接触时的极化变形程度增加,不利于液滴融合,当电场强度过高时,液滴会发生破碎;当电场强度达到2 860 kV/m时,液滴粒子迅速向边壁移动,液滴在其端部向四周扩张之前,已经发生破碎,液滴的破碎时间趋于稳定;当电场强度达到3 580 kV/m时,液滴两端受到了更大的电场力,液滴被迅速拉伸变形,液滴从中间部位直接破碎为左右两个子液滴;当液滴直径达到6 mm时,固壁边界抑制液滴变形,液滴的破碎时间迅速上升。
Abstract
An smooth particle hydrodynamics (SPH) model suitable for droplet dynamics under the action of an electric field was establishd, and the accuracy of the model was verified. This model was used to study the effect of electric field intensity on droplet coalescence time. The results showed that as the electric field intensity increased, the degree of polarization deformation during droplet contact increased, which was not conducive to droplet fusion. When the electric field intensity was too high, the droplets would undergo fragmentation. When the electric field strength reached 2 860 kv/m, the droplet particles moved quickly to the edge wall. Before the droplet expanded to the surrounding area at its end, it had already broken, and the breaking time of the droplet tended to stabilize. When the electric field strength reached 3 580 kV/m, the two ends of the droplet were subjected to greater electric field forces, and the droplet was rapidly stretched and deformed. The droplet breaked directly into two sub droplets on the left and right from the middle part. When the diameter of the droplet reached 6 mm, the suppression of droplet stretching deformation by the solid wall boundary was significantly enhanced, and the breaking time of the droplet increased rapidly.
中图分类号 TG174.4 DOI 10.11973/fsyfh-202312011
所属栏目 数值模拟
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收稿日期 2022/8/4
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引用该论文: ZHANG Yanling,HAN Lei,XU Weiwei,CHEN Wenwu,QU Dingrong. Numerical Simulation of Droplet Dynamics under Electric Field Based on SPH Method[J]. Corrosion & Protection, 2023, 44(12): 74
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参考文献
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【2】朱忠辉. 静电场中液滴聚并过程的数值模拟及机理研究[D].镇江:江苏大学, 2017.
【3】MOHAMMADI M.Numerical and experimental study on electric field driven coalescence of binary falling droplets in oil[J].Separation and Purification Technology, 2017, 176:262-276.
【4】强洪夫, 陈福振, 高巍然.基于SPH方法的表面张力修正算法及其应用[J].计算力学学报, 2011, 28(S1):37-42.
【5】白莉, 倪玲英, 郭长会, 等.乳状液液滴在高压直流电场中的变形与破裂分析[J].应用力学学报, 2013, 30(1)76-79, 148.
【6】MORRIS J P.Simulating surface tension with smoothed particle hydrodynamics[J].International Journal for Numerical Methods in Fluids, 2000, 33(3):333-353.
【7】MONAGHAN J J.SPH without a tensile instability[J].Journal of Computational Physics, 2000, 159(2):290-311.
【8】COLAGROSSI A, LANDRINI M.Numerical simulation of interfacial flows by smoothed particle hydrodynamics[J].Journal of Computational Physics, 2003, 191(2):448-475.
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