【摘要】 为研究由管式电极形成的非均匀电场中分散相水颗粒的动力学行为及影响因素,运用相场方法,建立水颗粒在非均匀电场中的物理模型,采用数值模拟法研究了电场作用下分散相水颗粒的变形和聚结过程,分析了电压、水颗粒粒径和电场强度分布对水颗粒动力学行为的影响。研究结果表明:在非均匀电场中水颗粒表面电荷密度分布不均,靠近电极端表面电荷密度和电场力最大,远离电极端表面电荷密度和电场力最小;在一定范围内增大电压和水颗粒粒径,水颗粒变形量增大;随着电场强度变化率增大,介电泳力越大,水颗粒向电极方向移动距离增大,加大了水颗粒间距离,延长了聚结时间。所得结论可为管式电极聚结器的设计提供参考。更多还原

【Abstract】 To study the dynamic behavior and influencing factors of disperse phase water droplets in a non-uniform electric field formed by tubular electrodes,a physical model of water droplets in a non-uniform electric field is established using phase-field method. The numerical simulation is used to study the deformation and coalescence process of disperse phase water droplets under the electric field. The effects of voltage,water droplet size and electric field intensity distribution on the dynamic behavior of water droplets are analyzed. The results show that the surface charge density distribution on water droplet is uneven in the non-uniform electric field. The surface charge density and electric field force reaches the maximum and the minimum at the nearest and farthest point from the electrode end,respectively. Increasing the voltage and water droplet size within a certain range could increase the water droplet deformation. With the increase of change rate of electric field strength,the dielectrophoretic force increases,the water droplets movement distance to the electrode end increases,thus increases the distance between water droplets and consequently extends the coalescence time. The study could provide references for the design of tubular electrode coalescence device.更多还原