Flow Characteristics of Magnetic Fluid on Yoke Surface of Magnetic Fluid Seal

磁流体密封磁轭表面磁流体的流动特性

• 批准号: 03650127
• 负责人: MITSUYA Yasunaga
• 金额: $ 1.28万
• 依托单位: Nagoya University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1991
• 资助国家: 日本
• 起止时间: 1991 至 1992
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-03650127/
• 关键词: Magnetic field; Magnetic fluid seal; Flow on surface; Magnetic fluid; Splashing; Meniscus; 磁性流体ミ-ル

The magnetic force distribution on the yoke surface of a magnetic fluid seal is clarified using finite element analysis. Calculations are performed for two kinds of typical magnetic fluid shape, that is, film shape and spike shape. It is interesting to note that magnetic force direction switches halfway the yoke length. The region wherein magnetic fluid flows to the yoke top direction is found to be wider for a thicker magnet,thicker yoke and the case with a spindle. This leads to a new concept of magnetic fluid seal having self injection action.The critical rotational speed at which splashing of the magnetic fluid is initiated is found to be uniquely determined by the spread of the meniscus under a fixed magnetic flux condition. It should be noted that, with increasing flux density from 0.2 to 0.4T, the critical speed is considerable increased nearly two times.Calculation procedure to determine the surface shape of the meniscus formed around the seal gap is established through the extension of the SMAC method to the case involving surface tension and magnetic force. The calculation is justified being compared with the experimental meniscus shape.

通过有限元分析，阐明了磁流体密封磁轭表面的磁力分布。对两种典型的磁流体形状进行了计算，即薄膜形状和尖峰形状。值得注意的是，磁力方向在磁轭长度的一半处切换。磁流体流向磁轭顶部方向的区域被发现对于较厚的磁体、较厚的磁轭和具有主轴的情况更宽。这就引出了具有自喷射作用的磁流体密封的新概念，在一定的磁通量条件下，磁流体飞溅的临界转速由弯月面的扩展度唯一决定。当磁通密度从0.2 T增加到0.4 T时，临界转速增加了近2倍，通过将SMAC方法推广到表面张力和磁力共同作用的情况，建立了确定密封间隙附近弯月面形状的计算方法。通过与实验弯月面形状的比较，验证了理论计算的正确性。

项目成果

Y. Mitsuya, T. Abe and S. matsunaga: "Magnetic Force Actiong on Magnetic Fluid Spread over Yoke Surface of Magnetic Fluid Seal" Proc. SIXTH INTERNATIONAL CONFERENCE ON MAGNETIC FLUIDS. 192-193 (1992)

Y. Mitsuya、T. Abe 和 S. matsunaga：“磁力作用于分布在磁流体密封轭表面上的磁流体”Proc。

Y. Mitsuya, K. Tomita and M. Hosoya: "Experimental Study on Splashing Characteristics of Magnetic Fluid in Magnetic Fluid Seal" Proc. SIXTH INTERNATIONAL CONFERENCE ON MAGNETIC FLUIDS. 194-195 (1992)

Y. Mitsuya、K. Tomita 和 M. Hosoya：“磁流体密封中磁流体飞溅特性的实验研究”Proc。

三矢 保永・安部 司・松永 茂樹: "Magnrtic Force Actiong on Magnetic Fluid Spread over Yoke Surface of Magnetic Fluid Seal" Proc.SIXTH INTERNATIONAL CONFERENCE ON MAGNETIC FLUIDS. 192-193 (1992)

Yasunaga Mitsuya、Tsukasa Abe、Shigeki Matsunaga：“磁力作用于磁流体密封轭表面上的磁力作用”，第六届国际磁流体会议（1992 年）。

Y.Mitsuya,K.Tomita,M.Hosoya: "Experimental Study on Splashing Characteristics of Magnetic Fluid in Magnetic Fluid Seal" Journal of Magnetism and Magnetic Materials. (1992)

Y.Mitsuya，K.Tomita，M.Hosoya：“磁流体密封中磁流体飞溅特性的实验研究”《磁性与磁性材料杂志》。

三矢 保永・安部 司・松永 茂樹: "Experimental study on splashing characteristics of magnetic Fluid in a magnetic fluid seal" Journal of Magnetism and Magnetic Materials 掲載予定. 122. (1993)

Yasunaga Mitsuya、Tsukasa Abe 和 Shigeki Matsunaga：“磁流体密封中磁流体飞溅特性的实验研究”《磁性与磁性材料杂志》122。（1993 年）