The rheology of bimodal hard‐sphere dispersions
The rheology of bimodal hard‐sphere dispersions
复制标题
双峰硬球分散体的流变学
DOI：
10.1063/1.868226
复制
发表时间：
1994
影响因子：
4.6
通讯作者：
R. Powell
中科院分区：
文献类型：
--
作者：
Chingyi Chang;R. Powell
对于具有不同粒度比的面积分数φa、λ(大球直径/小球直径=1、2和4)以及总固体小球的不同分数ξ(0.07、0.27、0.49、0.64和0.83)，测定了双峰分布的硬球悬浮液的单层粘度。颗粒分布采用蒙特卡罗方法，流体动力相互作用采用Stokesian动力学方法计算。这些结果对应于高频动态粘度，并与流体动力相互作用球形颗粒的动态模拟结果[Chang和Powell，J.流体机械]进行了比较。253，1(1993)]。与蒙特卡罗模拟结果相比，动态模拟在高浓度下得到了更高的相对粘度ηr。这是因为在动态模拟中存在的蒙特卡罗模拟中没有完全穿过周期单元的长团簇。当..。
The viscosity of a monolayer of a suspension of bimodally distributed hard spheres is determined for area fractions, φa, from 0.15 to 0.74 with different particle size ratios, λ (diameter of large sphere/diameter of small spheres=1, 2, and 4), and different fractions of small spheres of total solids, ξ (0.07, 0.27, 0.49, 0.64, and 0.83). Particle distributions are generated by a Monte Carlo technique and the hydrodynamic interactions are calculated by Stokesian dynamics. These results, which correspond to the high‐frequency dynamic viscosities, are compared with those from the dynamic simulation of hydrodynamically interacting spherical particles [Chang and Powell, J. Fluid Mech. 253, 1 (1993)]. Dynamic simulation is found to yield higher relative viscosities, ηr, as compared with the results of Monte Carlo simulation at high concentrations. This results from the absence of long clusters that completely cross a periodic cell in the Monte Carlo simulations that are present in the dynamic simulations. When ...