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強磁性棒状粒子からなる分散系の粒子の配向特性 と粘度に 及ぼすクラスタ間の相互作用の影響* (平均場近似によるせん断流を対象とした解析) 佐 藤 明*1 Influence of Cluster-Cluster Interactions on Particle Orientational Characteristics and Viscosity of a Colloidal Dispersion Composed of Ferromagnetic Spherocylinder Particles (Analysis by Means of Mean Field Approximation for a Simple Shear Flow) Akira SATOH*2 *2 Department of Machine Intelligence and System Engineering, Akita Prefectural University, 84-4 Ebinokuchi, Tsuchiya-aza, Honjo-shi, Akita, 015-0055 Japan We have theoretically investigated the particle orientational distribution and viscosity of a dense colloidal dipersion composed of ferromagnetic spheocylinder particles under circumstances of an applied magnetic field. The mean field approximation has been applied to take into account the magnetic interactions of the particle of interest with the other ones which belong to the neighboring clusters, besides its own cluster. The basic equation of the orientational distribution function, which is the integro-differential equation, has approximately been solved by Galerkin's method and the method of successive approximation. Some of main results obtained here are summarized as follows. Even when the magnetic interaction between particles is of the order of the thermal energy, the effect of particle-particle interactions on the orientational distribution comes to appear more significantly with increasing the volumetric fraction of particles; the orientational distribution function exhibits a sharper peak in the direction nearer to the magnetic field one as the volumetric fraction increases. Such a significant inclination of the particle in the field direction induces the large increase in the viscosity in the range of larger values of the volumetric fraction. The above-mentioned characteristics of the orientational distribution and viscosity come to appear more significantly when the influence of the applied magnetic field is not relatively so strong compared with magnetic particleparticle interactions.

nihon kikai gakkai ronbunshū. b

Influence of Cluster-Cluster Interactions on Particle Orientational Characteristics and Viscosity of a Colloidal Dispersion Composed of Ferromagnetic Spherocylinder Particles (Analysis by Means of Mean Field Approximation for a Simple Shear Flow)