Collaborative Research: Flow Transitions and Turbulence in the Taylor-Couette Flow of Dilute Polymer Solutions

ABSTRACTPROPOSAL没有。项目描述：主要研究人员：SUSAN MULLER， R. sureshkumar机构：加州大学伯克利分校，华盛顿大学稀聚合物溶液泰勒-库埃特流动中的流动转变和湍流这是一项聚合物诱导的曲线流动中流动转变、湍流和减阻效应的研究。根据这笔拨款，将采用一种实验和数值模拟相结合的方法来提供补充信息，并允许对实验和直接数值模拟结果进行直接的定量比较。这将产生忠实的建模和仿真工具来描述聚合物链和非线性流动状态之间的相互作用，指导重要参数范围的研究，深入了解在减阻中重要的流动结构和聚合物链结构类型，并提供有关聚合物诱导湍流减阻机制的定量信息。这项研究将促进对大型流体输送系统中摩擦控制的理解，并指导聚合物添加剂的开发，以减少阻力。此外，聚合物如何引起流体流动和阻力的定性和定量变化的知识将有助于开发聚合物模拟技术，用于设计节能混合装置和船舶和潜艇的减阻系统，从而极大地节省燃料成本。除了节能的潜力之外，在微流控装置的大分子处理领域以及传统聚合物混合和处理操作的优化方面也有望产生更广泛的影响。此外，PI将开发一个基于泰勒-库埃特流的本科运输实验室模块和网站。该网站除了总结研究成果外，还将包括流动可视化电影，旨在向高中生和本科生介绍流动稳定性、湍流和聚合物对流动的影响的基本概念。

ABSTRACTPROPOSAL NO.: CTS-0335169, CTS-0335348PRINCIPAL INVESTIGATORS: SUSAN MULLER, R. SURESHKUMARINSTITUTION: UNIVERSITY OF CAL - BERKELEY, WASHINGTON UNIVERSITYFLOW TRANSITIONS AND TURBULENCE IN THE TAYLOR-COUETTE FLOW OF DILUTE POLYMER SOLUTIONSThis is a study of polymer-induced effects on flow transitions, turbulence, and drag reduction in curvilinear flows. Under this grant, a combined experimental and numerical modeling approach will be undertaken to provide complementary information and allow direct, quantitative comparisons of experiments and direct numerical simulation results. This will yield faithful modeling and simulation tools to describe the interaction between polymer chains and nonlinear flow states, guidance regarding important parameter ranges to study, insight into the types of flow structures and polymer chain architectures important in drag reduction, and provide quantitative information about the mechanisms of polymer-induced turbulent drag reduction. This study will advance understanding of friction control in large scale fluid transportation systems and guide the development of polymeric additives that will lead to drag reduction. In addition, the knowledge of how polymers induce qualitative and quantitative changes in fluid flow and drag will help develop polymer-mimetic technologies for designing energy-efficient mixing devices and drag reduction systems for ships and submarines that could result in enormous savings in fuel costs. In addition to the potential for energy savings, broader impacts in the areas of processing of macromolecules in microfluidic devices and in the optimization of conventional polymer mixing and processing operations are also anticipated. In addition, the PI's will develop an undergraduate transport laboratory module and website based on Taylor-Couette flow. The website, in addition to summarizing the research results, will include flow visualization movies aimed at introducing basic ideas of flow stability, turbulence, and the effects of polymers on flow to high school and undergraduate students.