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油包水液滴在高压脉冲电场作用下发生振动伸缩变形,对乳化油液的聚结破乳具有良好地促进作用。运用电流体动力学(EHD)理论,建立液滴在脉冲电场中的电介质物理学模型,得到液滴内外极化电场分布和极化电场力,完成了液滴内外速度场与流动应力分析。通过脉冲电场谐波分量作用下液滴伸缩变形稳态分量和振动分量的计算,得到了液滴载电场中振动伸缩变形表达式。结果表明,理论计算得到的液滴振动伸缩变形量与实验结果相近,证实了运用EHD理论预测脉冲电场作用下油中液滴的振动变形是合理可靠的,对丰富和完善电场破乳动力学机理研究具有一定意义。
The water-in-oil droplets vibrate and deform under the action of high-voltage pulsed electric field and promote the coalescence and demulsification of emulsified oil. By using the theory of electrohydrodynamics (EHD), the dielectric physics model of droplet in a pulsed electric field is established. The distribution of electric field inside and outside the droplet and the polarization electric field force are obtained. The velocity field and flow stress inside and outside the droplet are analyzed. Through the calculation of the steady-state component and the vibrational component of the droplet’s elastic deformation caused by the harmonic component of the pulse electric field, the expression of the elastic deformation in the electric field of the liquid droplet is obtained. The results show that the theoretical calculation of the droplet vibration telescopic deformation and experimental results are similar to confirm the use of EHD theory to predict the droplet vibration of oil droplets under the vibration and deformation is reasonable and reliable, to enrich and improve the electric field emulsion breaking mechanism Research has some significance.