两个非磁性颗粒在磁流体中的沉降现象研究

发布时间：2018-04-01 17:27

  本文选题：磁流体　切入点：非磁性颗粒　出处：《物理学报》2017年16期

【摘要】：在磁场作用下,在磁流体里添加非磁性颗粒(non-magnetic particles,NPs),可以使得NPs形成不同的结构,操控NPs的运动从而影响磁流体的特性,这种应用逐渐受到了研究者的关注.为了更好地操控磁流体里NPs的运动,本文采用一种多物理模型研究在外加磁场作用下,磁流体中两个NPs沉降的运动过程.其中,用格子玻尔兹曼方法模拟磁流体的运动,外加磁场对磁流体的影响用一种自修正方法求解泊松方程,这个自修正方法可以使欧姆定律满足守恒定律.NPs之间的偶极干扰力采用偶极力模型,同时采用一种相对过渡平滑的共轭边界条件处理NPs与磁流体交界面的流固干扰以避免磁场密度过渡的突变.本文主要探究两个NPs在磁流体中的沉降,揭示磁场作用下NPs的相互干扰原理;同时,对控制NPs运动时的参数进行调节,得到NPs不同的运动轨迹,达到操控颗粒运动的目的.本研究可对NPs在磁流体中的应用提供定量的分析结果,对NPs在工业上的应用提供有力的理论支撑.
[Abstract]:Under the action of magnetic field, adding non-magnetic particles non-magnetic particles to the magnetic fluid can make the NPs form different structures and control the motion of NPs, thus affecting the properties of the magnetic fluid. In order to better control the motion of NPs in magnetic fluid, a multi-physical model is used to study the motion process of two NPs subsidence in magnetic fluid under the action of external magnetic field. The lattice Boltzmann method is used to simulate the motion of the magnetic fluid. The effect of the applied magnetic field on the magnetic fluid is solved by a self-correction method. This self-correction method can make Ohm's law satisfy the conservation law. NPs. At the same time, a relatively smooth conjugate boundary condition is used to deal with the fluid-solid interference at the interface between NPs and magnetic fluid to avoid the sudden change of magnetic field density transition. This paper mainly discusses the settlement of two NPs in magnetic fluid. The mutual interference principle of NPs under the action of magnetic field is revealed. At the same time, the parameters of controlling NPs motion are adjusted, and the different motion trajectories of NPs are obtained. This study can provide quantitative analysis results for the application of NPs in magnetofluids and provide strong theoretical support for the application of NPs in industry.
【作者单位】： 汕头大学工学院;同志社大学能源转换与研究中心;
【基金】：国家自然科学基金(批准号:11372168)资助的课题~~
【分类号】：O361.3

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