三次元流れ場中にある強磁性棒状粒子の配向分布に印加磁場が及ぼす影響(流体工学,流体機械)

概要

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The behaviors of the orientational distributions of a dilute colloidal dispersion, which is composed of the ferromagnetic spherocylinder particles influenced by the external magnetic field, have been investigated theoretically. A series of basic equations is derived for the orientational distributions of the particles in steady three dimensional flow by using the perturbation expansion method. Exact solutions of the basic equations are obtained theoretically. By using the solutions, we have discussed the time-dependent behaviors of the particles. We have derived the condition that the steady state of the distribution is realized by the external magnetic field, the steady flow and the rotational Brownian motion of the particles. In order to estimate the response of the particles for the magnetic field, the reference time is obtained from the rate of the convergence to the steady state. It is shown that the steady flow causes a distortion of the orientational distribution under the typical three types of the magnetic direction.
社団法人日本機械学会の論文
2007-11-25