GOALI: Fluid-Particle Interaction and Confinement in Structured Fluids

本文旨在研究胶体铁磁流体在磁场作用下的粘性流动及其在固壁附近的特殊行为。采用实验、模拟和数值模拟相结合的方法，研究磁流体纳米结构与宏观流动和换热特性之间的关系。新设计的扫描纳米流变仪、表面力装置、近场光学显微镜、磁扫描力显微镜和多普勒测速仪将被用来获得几个长度尺度的实验信息。将对表面进行化学和结构改性，以研究其对固体壁附近粘附性和粘度的影响。粒子动力学及其团聚的分子模拟将通过本构关系包含在宏观数值模拟中。磁流体中流动和换热的有限元三维模拟将在实际情况下进行测试。这是一项由埃克森美孚研发和能源国际公司共同参与的大学-产业(GOALI)项目。如果成功，该项目将为工业装置中磁流体的应用开发出基本的理解和预测方法，与变压器和电机中的冷却系统直接相关。

AbstractCTS-9908912B.A. Finlayson, U. of WashingtonThe objective is to investigate the viscous flow of colloidal ferrofluids and their particular behavior near solid walls in the presence of magnetic fields. The connection between the ferrofluid nanostructure and macroscopic flow and heat transfer characteristics will be investigated using a combination of experimental, modeling and numerical simulation techniques. A newly designed scanning nanorheometer, a surface force apparatus, near-field optical microscopy, magnetic scanning force microscopy and Doppler velocimetry will be used to obtain experimental information at several length scales. Surfaces will be chemically and structurally modified in order to study their effects on adhesion and viscosity near solid walls. Molecular simulations of particle dynamics and their agglomeration will be included in the macroscopic numerical simulations via constitutive relationships. Finite element three-dimensional simulation of flow and heat transfer in ferrofluids will be tested for realistic situations. This is a collaborative university-industry (GOALI) proposal involving Exxon R&D and Energy International, Inc. If successful, the project will develop fundamental understanding and predictive methods for the application of ferrofluids in industrial installations, with immediate relevance in cooling systems in transformers and motors.