铁磁流体液滴下落的数值模拟研究  

Numerical Simulation Study of Falling Ferrofluid Droplets

作　　者：刘玉婷 李明军[1] LIU Yuting;LI Mingjun(Xiangtan University,Xiangtan 411105,China)

机构地区：[1]湘潭大学,湖南湘潭411105

出　　处：《工业技术创新》2023年第1期31-41,共11页Industrial Technology Innovation

基　　金：国家自然科学基金项目(项目编号:11971411);湖湘高层次人才聚集工程—创新团队项目(项目编号:2019RS1060)。

摘　　要：为更深入了解铁磁流体液滴的流动机制,建立理论模型和二维数值模型,模拟并考察不同大小的两个铁磁流体液滴之间的形态变化以及相互作用。采用耦合了流体体积(VOF)和水平集(Level Set)的界面追踪方法(VOSET)来捕捉两相界面的演化规律,考察初始分离距离、磁场施加角度以及磁场强度这三个因素对两个铁磁流体液滴聚结行为的影响。数值模拟结果表明,初始分离距离存在一个阈值,当初始分离距离大于该阈值时,两个液滴不发生聚结,反之,两个液滴发生聚结;当磁场方向为水平或者45°时,磁场会阻碍两个液滴聚结,而当磁场方向为垂直向上时,磁场会促进两个液滴聚结,并且随着磁场强度的增大,阻碍或促进作用相应增强。In order to better understand the flow mechanism of ferrofluid droplets, a theoretical model and a two-dimensional numerical model were established to simulate and investigate the morphological changes and interactions between two ferrofluid droplets with different sizes. The volume-of-fluid and level set(VOSET) with method volume-of-fluid(VOF) and level set coupled together was used to capture the evolution law of the two-phase interface, and the effects of initial separation distance, magnetic field exerting angle and magnetic field intensity on the coalescence behavior of the two ferrofluid droplets were investigated. The numerical simulation results show that there is a threshold for the initial separation distance. When the initial separation distance is greater than this threshold, two droplets do not coalesce;otherwise, two droplets coalesce. When the direction of the magnetic field is horizontal or 45 degrees,the magnetic field will hinder the coalescence of two droplets, while when the magnetic field direction is vertical, the magnetic field will promote the coalescence of two droplets, and with the increase of the magnetic field intensity, the effect of hindrance or promotion will be enhanced correspondingly.

关 键 词：铁磁流体 界面追踪方法(VOSET) 液滴聚结 磁场强度 水平集 

分 类 号：O359.1[理学—流体力学]