用 VOSET 方法对电场中液滴动力学进行二维数值表征

IF 2.5 3区 工程技术 Q2 MECHANICS
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引用次数: 0

摘要

流体容积和液面集(VOSET)耦合模型被扩展用于电流体动力(EHD)流动的模拟。通过与之前的结果进行比较,验证了所提出模型的良好准确性。虽然在某些条件下,电致伸缩力可能大于库仑力和介电力,但除了压力分布外,它对液滴的动态行为没有影响。系统研究了液滴对的电凝聚。除了凝聚和排斥之外,在排斥性流体动力和吸引力电场力的平衡下,两液滴可能既不凝聚也不排斥。只要电导比小于介电比,两液滴就会发生电凝聚。分离液滴凝聚和排斥的临界介电比随着电导比的增大而增大。两个液滴的电凝聚时间随着介电比和电毛细管数的增加而缩短。然而,在不同的导电率和毛细管数下,电凝聚时间随导电率的增加而呈现出不同的变化趋势。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A two-dimensional numerical characterization on the droplet dynamics in the electric field by VOSET method
A coupled volume-of-fluid and level set (VOSET) model is extended to the simulation of electro-hydrodynamic (EHD) flow. The good accuracy of proposed model is validated by comparing with previous results. Although the electrostrictive force might be greater than the Coulomb and dielectric forces under certain conditions, it has no influence on droplet dynamic behaviors except the pressure distribution. The electro-coalescence of droplet pair is systematically investigated. In addition to the coalescence and repulsion, two droplets might neither coalesce nor repulse with the repulsive hydrodynamic force and attractive electric force strike a balance. The electro-coalescence of two droplets always happens as long as the electric conductivity ratio is smaller than the permittivity ratio. The critical permittivity ratio separating the coalescence and repulsion of droplets increases as the increase of electric conductivity ratio. The electro-coalescence time of two droplets decreases as the permittivity ratio and electric capillary number increase. Nevertheless, the electro-coalescence time shows different variation tendency as the increase of electric conductivity ratio with different permittivity ratios and electric capillary numbers.
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来源期刊
CiteScore
5.90
自引率
3.80%
发文量
127
审稿时长
58 days
期刊介绍: The European Journal of Mechanics - B/Fluids publishes papers in all fields of fluid mechanics. Although investigations in well-established areas are within the scope of the journal, recent developments and innovative ideas are particularly welcome. Theoretical, computational and experimental papers are equally welcome. Mathematical methods, be they deterministic or stochastic, analytical or numerical, will be accepted provided they serve to clarify some identifiable problems in fluid mechanics, and provided the significance of results is explained. Similarly, experimental papers must add physical insight in to the understanding of fluid mechanics.
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