The Mechanics of Complex Fluids: Drop Breakup and Shear Induced Diffusion Effects in NonNewtonian Fluids

本实验研究旨在了解控制粘弹性或非牛顿悬浮液中含有固体颗粒或液滴的悬浮液的微观结构特征的流体物理学。这类颗粒-液体悬浮液是聚合物加工业中新材料的主要来源。不同的实验技术将用于研究粘弹性悬浮流体中的非胶体固体颗粒悬浮液和粘弹性或粘弹性液滴的乳液。光学技术和两个互补的流动装置将用于探索在处理流程中遇到的两个关键特征。所考虑的悬浮液具有发展出强烈不均匀的颗粒浓度分布的趋势，并且，在某些情况下，颗粒自发地组织成沿流动方向排列的长链。计算机控制的四辊轧机将用于研究乳状液中牛顿液滴和粘弹性液滴的变形和破碎。

CTS-9523238 Leal This experimental study is aimed at understanding the fluid physics which control the microstructural features of suspensions containing either solid particles or drops in a viscoelastic or non-Newtonian suspended liquid. This class of particle-liquid suspensions is a major source of new materials in the polymer processing industry. Different experimental techniques will be used to study suspensions of non-colloidal solid particles in a viscoelastic suspending fluid and emulsions of viqcous or viscoelastic drops. Optical techniques and two complimentary flow devices will be used to explore two critical features encountered in processing flows. The class of suspensions under consideration have the tendency to develop strongly non-uniform particle concentration distributions, and, in some cases the particles spontaneously organize into long chains aligned in the flow direction. A computer- controlled four-roll mill will be adapted to study deformation and breakup for Newtonian and viscoelastic drops in emulsions.