Abstract

Polydispersity is an essential factor in characterizing suspensions, specifically in industrial processes. In the present work, we report the viscosity of non-colloidal polydisperse glass suspensions for the first time and study the predictability of log-transformed quadratic viscosity equations over a wide range of blending ratios at a constant total volume fraction of solid particles. The viscosity and viscoelasticity measurement of multimodal suspensions was carried out by mixing three monomodally distributed solid particle suspensions with a relatively narrow size distribution to prepare bidisperse and tridisperse suspensions. The results showed a good agreement between experimental and predicted viscosity data for multimodal suspensions, making the generalized model a good alternative to describe the viscosity of polydisperse mixtures. The diameter ratio of large-to-small particles and the volume fraction of small particles in bidisperse systems strongly affected the viscoelastic behavior of multimodal suspensions. In addition, the dynamic rheology measurement showed that the storage modulus was independent of frequency, while a linear frequency dependence of loss modulus was observed for multimodal suspensions. In the case of polydisperse suspensions, this yield stress and dimensionless elastic modulus increased by declining the particle size ratio and increasing the volume fraction of small particles in bidisperse subsystems.

摘要

多分散性是表征悬浮液的一个重要因素，特别是在工业过程中。在目前的工作中，我们首次报告了非胶体多分散玻璃悬浮液的粘度，并研究了在固体颗粒总体积分数恒定的情况下，在各种混合比范围内对数变换的二次粘度方程的可预测性。通过混合三种具有相对窄尺寸分布的单峰分布固体颗粒悬浮液以制备双分散和三分散悬浮液来进行多峰悬浮液的粘度和粘弹性测量。结果表明，多峰悬浮液的实验粘度数据与预测粘度数据之间具有良好的一致性，使得广义模型成为描述多分散混合物粘度的良好替代方案。双分散体系中大颗粒与小颗粒的直径比和小颗粒的体积分数强烈影响多峰悬浮液的粘弹性行为。此外，动态流变测量表明，储能模量与频率无关，而对于多峰悬浮液，观察到损耗模量的线性频率依赖性。在多分散悬浮液的情况下，通过减小双分散子系统中的颗粒尺寸比和增加小颗粒的体积分数，屈服应力和无量纲弹性模量增加。动态流变学测量表明，储能模量与频率无关，而对于多峰悬浮液，观察到损耗模量的线性频率依赖性。在多分散悬浮液的情况下，通过减小双分散子系统中的颗粒尺寸比和增加小颗粒的体积分数，屈服应力和无量纲弹性模量增加。动态流变学测量表明，储能模量与频率无关，而对于多峰悬浮液，观察到损耗模量的线性频率依赖性。在多分散悬浮液的情况下，通过减小双分散子系统中的颗粒尺寸比和增加小颗粒的体积分数，屈服应力和无量纲弹性模量增加。