レオロジーモデルに基づく濃厚系凝集サスペンジョンのフラクタル次元の推定

概要

論文の詳細を見る
Details of the rheology of concentrated suspensions are matters of important practical interest. For coagulated systems, rheological models based on fractal concepts have been proposed. The fractal dimension which is used to quantify the aggregate structure in these models has been measured in dilute suspensions but not in concentrated suspensions. The present study established the effect of shear stress and volume fraction on the structure of fractal aggregate in concentrated systems; the fractal dimension of the aggregate was established by adopting the rheological model of flocculated concentrated suspensions proposed by Mills and the fracture model of an aggregate in shear field proposed by Mühle. The result showed that the fractal dimension of an aggregate in a sheared suspension increases with volume fraction rather than with shear rate, γ. It is concluded that by increasing the concentration, the interpenetration of aggregates cause densification and thereby increases in the fractal dimension.