扁平回転楕円体粒子分散系のブラウン動力学シミュレーション(非ニュートン(1),一般講演)

概要

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Brownian dynamics simulations of suspension of oblate spheroidal particles were carried out. The oblate spheroid particles were applied as a model of disc-like particles such as clay, pitch, and discotic liquid crystals. The Gay-Berne potential was used to model inter-particle forces. The change in phase with the number density of the particles at equilibrium state and the behavior of the particles and rheological properties under simple shear flows were numerically analyzed. The phase of the system changed from isotropic to nematic with increasing the particle concentration of the system. In the simulations under simple shear flows, the initial state of the system was nematic phase at equilibrium. The numerical simulation of the simple shear flow predicted the shear-thinning in viscosity, negative first normal stress difference, and positive second normal stress difference, and these results qualitatively agreed with predictions from a constitutive equation for discotic nematics.
日本流体力学会の論文
2008-09-04