U.S.-France Cooperative Research: Hydrodynamics of Fluid Particle Systems

该奖项将支持斯坦福大学化学工程系George Homsy博士和法国巴黎高等物理与工业学院ElisElizabeth Guazelli博士之间的合作研究。该项目的目标是研究流体颗粒系统的流体动力学。研究人员将研究悬浮和流态化床中的流体动力学效应。这种分散的多相体系的行为在许多科学和技术领域都很重要。这些包括在处理和加工材料方面的应用，例如：1)复合材料和乳状液，2)流体的化学处理，如在流态化反应器中，3)环境流体力学，如自然流动中的沉积物和营养物质的传输，以及4)分离技术，如浮选、沉淀和澄清。尽管在过去的几十年里，人们对这些领域进行了深入的研究，但对这些系统的力学行为的许多基本方面仍然知之甚少，特别是组成分散相的粒子之间的相互作用。在这个项目中，研究人员计划开展：1)悬浮液中颗粒间水动力相互作用的理论和数值研究，以及2)沉积悬浮液、沸腾床和所谓的“铁流体”行为的实验研究。即磁性布朗粒子的悬浮液。法国集团的主要重点将是实验研究，而美国的重点将是理论和数值模拟。该项目将受益于法国实验室提供的用于流动可视化的特殊核磁共振设施。

This award will support collaborative research between Dr. George Homsy, Department of Chemical Engineering, Stanford University and Dr. Elisabeth Guazelli, Ecole Superieure de Physique et Chimie Industrielles, Paris, France. The objective of the project is to investigate the hydrodynamics of fluid particle systems. The investigators will study hydrodynamic effects in suspensions and fluidized beds. The behavior of such dispersed multiphase systems is important in a number of fields of science and technology. These include applications in handling and processing materials such as: 1) composites and emulsions, 2) chemical processing of fluids, as in fluidized bed reactors, 3) environmental fluid mechanics, such as sediment and nutrient transport in natural flows and 4) separation technologies, such as flotation, sedimentation and clarification. Despite intensive study of these fields over the last several decades, there are many fundamental aspects of the mechanical behavior of such systems that remain poorly understood, in particular, the interactions between the particles making up the dispersed phase. In this project, the investigators propose to carry out: 1) theoretical and numerical studies of hydrodynamic interactions between particles in suspension, and 2) experimental studies of the behavior of sedimenting suspen- sions, fluidized beds, and so-called "ferro fluids", i.e. suspensions of magnetic Brownian particles. The primary focus of the French group will be the experimental studies, while that of the US will be theoretical and numerical modeling. The project will benefit from the availability of special NMR facilities for flow visualization in the French laboratory.