泥浆
结块
粘度
相对粘度
材料科学
粒子(生态学)
离散元法
粒径
剪切减薄
体积分数
流变学
表观粘度
机械
剪切速率
热力学
复合材料
化学
物理
地质学
物理化学
海洋学
作者
Yasuhiro Yoshida,T. Katsumoto,Sadashi Taniguchi,Atsuko Shimosaka,Yoshiyuki Shirakawa,Jusuke Hidaka
摘要
Prediction of the apparent viscosity of a slurry suspended fine particles is important for developing slurry-treating processes. After Einstein’s formulation for the apparent viscosity of a dilute, completely dispersed slurry, several viscosity equations were proposed. However, viscosity depends not only on the volume fraction of solid particles but also on many factors such as particle shape, particle interaction, the aggregation structure of suspended particles and the structure of fluid flow. A hybrid simulation employing the distinct element method (DEM) and the direct numerical simulation method (DNS) was developed to obtain the relation between these factors and the apparent viscosity of slurry suspended fine particles. The apparent viscosity of a completely dispersed slurry obtained by the simulation is in good agreement with the experimental and calculated values obtained by the empirical equations. Shear-thinning behavior due to the collapse of agglomerates with increase in mean shear rate was observed for the case of a slurry with agglomerated particles. This behavior was caused by the existence of so-called immobile water in the agglomerates. The influences of the shape of aggregation and particle interaction on the apparent viscosity are investigated by the simulation.
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