The Motion of Small Particles in Non-Newtonian Fluids

粒子在非牛顿流体中的运动将进行数值和实验研究。 非线性弹性哑铃的悬浮被用来模拟粘弹性流体。 哑铃通过低雷诺数流体力学的关系与宏观颗粒相互作用。 分析了弛豫时间、剪切变稀和惯性等参数对多颗粒相互作用和流动的影响。 将模拟各种流动条件、本构关系和典型应用，以获得该方法的适用性及其与各种物理流动系统的相关性的一般结论。 哑铃间的相互作用将使用快速多极方法计算。 核磁共振成像将用于测量沉降悬浮液和库埃特装置中的颗粒速度和浓度。所提出的数值方法已应用于食品和石油工业，聚合物流，塑料和其他材料加工中遇到的非牛顿流。

The motion of particles in non-Newtonian fluids will be numerically and experimentally investigated. A suspension of non-linear elastic dumbbells is used to simulate viscoelastic fluids. The dumbbells interact with macroscopic particles via relationships derived from low-Reynolds-number hydrodynamics. The effect of changing various parameters on the multiple particle interaction and flow will be analyzed, including the relaxation time, shear thinning and inertia. Various flow conditions, constitutive relationships, and typical applications will be simulated in order to obtain generic conclusions on the applicability of the method and its correlation with various physical flow systems. Inter-dumbbell interactions will be calculated using the fast multipole method. Nuclear magnetic resonance imaging will be applied to measure particle velocity and concentration in sedimenting suspensions and in Couette devices. The proposed numerical approach has applications to non-newtonian flows encountered in food and petroleum industries, polymeric flows, plastics and other materials processing.