強磁性棒状粒子からなる非希釈コロイド分散系における単純せん断流中での粒子挙動とレオロジー特性に関する研究 : 平均場近似による粒子間相互作用を考慮した解析(流体工学, 流体機械)

概要

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We have in vestigated the rheological properties and the orientational distributions of particles of a non-dilute colloidal dispersion, which is composed of ferromagnetic spherocylinder particles, subject to a simple shear flow. The mean field approximation is applied to take into account the interactions between spherocylinder particles. The basic equation of the orientational distribution function has been derived from the balance of the torques (including the term due to the mean field approximation) acting on the particle in an applied magnetic field. It is an integrao-differential equation. Then, the governing equation has been solved by means of the method of successive approximation and Galerkin's method. The results obtained here are summarized as follows. For the case of strong magnetic interactions between particles, the particle exhibits a sharp peak of the orientational distribution even for a weak applied magnetic field. In this case, the average magnetic moment of the particle becomes large, which leads to strong interactions between the applied magnetic field and the particle. Thus, the particle tends to point to the magnetic field direction under these situations. Also, in this case, the large increase in the viscosity is obtained due to such a restriction concerning the particle orientation.
社団法人日本機械学会の論文
2002-09-25