Effect of Magnetic Field on Concentration of Magnetic Particles in a Magnetic Fluid Plug. Local Concentration under Nonuniform Transverse Field.
Effect of Magnetic Field on Concentration of Magnetic Particles in a Magnetic Fluid Plug. Local Concentration under Nonuniform Transverse Field.
复制标题
磁场对磁流体塞中磁性粒子浓度的影响。
DOI：
10.1299/kikaib.59.3762
复制
发表时间：
1993
期刊：
影响因子：
--
通讯作者：
S. Kamiyama
中科院分区：
文献类型：
--
作者：
A. Sato;K. Koike;T. Oyama;S. Kamiyama
通过实验研究，阐明了非均匀磁场条件下磁性流体塞中磁性颗粒的局部浓度。测量了氦氖激光在矩形横截面导管内传输磁流体的强度和相位差。偏光镜和分析仪的偏振角对应于各测点的磁通方向。利用与堵头面积小、厚度相同的磁流体膜，确定了透射光的相位差与磁性颗粒浓度之间的关系。该关系用于估计插头中每个测量点的局部磁性颗粒浓度。结果表明，磁性颗粒浓度较高的区域在磁极片附近形成，并随着磁通密度的增大而增大。
Experimental study is carried out to clarify the local concentration of magnetic particles in a magnetic fluid plug in a nonuniform magnetic field. The intensity and the phase differences of the He-Ne laser beam which transmits the magnetic fluid within a duct of rectangular cross section are measured. The polarization angles of polarizer and analyzer are set to the directions of magnetic flux at each measured point. Also, the relationship between the phase difference of the transmitted light and the concentration of the magnetic particles is determined using the magnetic fluid film which has a small area and the same thickness as the plug. This relationship is used to estimate the local concentration of magnetic particles at each measured point in the plug. It is clarified that the region with higher concentration of magnetic particles is formed near the magnetic pole pieces and it is enlarged with magnetic flux density.