密封间隙内纳米磁性流体与被密封液体相对运动速度分析  

Analysis on relative speed of nanometer magnetic fluid and sealed liquid inside sealing gap

作　　者：封士彩[1] 郭兰中[1] Feng Shicai;Guo Lanzhong(School of Mechanical Engineering,Changshu Institute of Technology,215500,Suzhou,China)

机构地区：[1]常熟理工学院机械工程学院,苏州215500

出　　处：《应用力学学报》2018年第6期1241-1247,1417,1418,共9页Chinese Journal of Applied Mechanics

基　　金：常熟理工学院科研基金项目(KYZ2011025;KYZ2012088;KYZ2013005Z;KYX20160101)

摘　　要：在磁性流体动密封液体中,不相溶的两液体相对运动速度是影响其界面稳定性的主要因素。应用流体运动理论,结合MATLAB仿真,确定了两液体沿旋转轴径向速度分布规律和相对运动速度差的大小。研究结果表明:影响该相对运动速度的因素主要是磁性流体的屈服应力、粘性系数、非牛顿影响系数、旋转轴转速和径向半径,其中非牛顿影响系数和转速最明显,而轴径影响很小;磁性流体与被密封液体相对运动速度差沿轴径呈抛物线分布,说明应用于密封液体的磁性流体具有相应的表观粘度,就能达到与被密封液体的相对运动速度差在界面稳定的阈值范围内。这对深入研究磁性流体与被密封液体的界面稳定性判据及外加磁场的设计具有重要的指导意义。In the dynamic sealing liquid with magnetic fluid, the relative speed of two non-dissolve liquid is the main factor that affects the interfacial stability. By motion theory and MATLAB software simulation, the radial velocity distribution of the two liquids along the rotation axis and the relative motion velocity difference can be determined. Current research shows that the main influential factors on the relative speed is the yield stress, thecoefficient of viscosity, the non-Newtonian influence coefficient, the rotational speed and radial radius of axis of magnetic fluid. Among them, effects of the non-Newtonian influence coefficient and rotational speed are the most obvious, and the effect of diameter of axle on relative velocity is little. The relative speed difference along the diameter of axle between the magnetic fluid and sealed liquid reveals parabolic distribution, so there is an apparent viscosity for magnetic fluid applied to seal liquid, the viscosity can make the relative speed difference within the scope of threshold for interface stability. These results may provide an important guiding significance for the further study of interfacial stability criterion and the design of the magnetic field to magnetic fluid and the sealed liquid.

关 键 词：纳米磁性流体 动密封液体 相对运动速度 最大速度差 

分 类 号：TB1[一般工业技术]