Research Initiation Award: Motion of Particles in Non-Newtonian Fluids

摘要：Howard Hu CTS-9410022本项目是对非牛顿流体中刚性粒子运动和相互作用的实验和数值研究。实验将在聚合物溶液的沉降和悬浮系统中使用不同形状的颗粒进行。数值模拟将基于处理流体和固体颗粒之间运动的非定常和非线性耦合的有限元包。将研究剪切速率相关粘度、法向应力差和流体弹性的非牛顿性质对颗粒运动和相互作用的影响，并确定控制这些非牛顿流体中颗粒行为的机制。本文主要围绕以下五个方面进行了研究：(1)长颗粒沉积物在非牛顿流体中的稳定取向；(2)粒子与壁面的相互作用和壁面对粒子运动的影响；(3)泥沙和悬浮颗粒的平衡位置和迁移；(4)颗粒与流动诱导结构的相互作用；(5)纤维悬浮液的流动。这些项目的结果将有助于非牛顿流体动力学的基础知识，以及具有悬浮颗粒的聚合物液体流动的建模。他们会发现通过使用聚合物溶液。* * *

Abstract Howard Hu CTS-9410022 This project is an experimental and numerical investigation for motion and interactions of rigid particles in non-Newtonian fluids. The experiments will be performed with particles of different shapes in sedimentation and suspension systems of polymer solutions. The numerical simulation will be based on a finite element package which handles the unsteady and non-linear coupling of the motion between fluid and solid particles. The effects of non-Newtonian properties of shear-rate dependent viscosity, normal stress differences and elasticity of fluids on the motions and interactions of particles will be examined, and the mechanisms that control the behavior of particles in those non-Newtonian fluids will be identified. Five topics are outlined in this study: (1) stable orientation of long particles sediments in non-Newtonian fluids; (2) particle-wall interactions and wall effects on particle motion; (3) equilibrium position and migration of sedimenting and suspended particles; (4) interactions between particles and flow induced structures; (5) flow of fiber suspensions. Results of these project will contributed to the fundamental knowledge of dynamics of non-Newtonian fluids, and to the modeling of flows of polymeric liquids with suspended particles. They will find through the use of polymer solutions. ***