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

项目编号：CTS-0335169，CTS-0335348项目研究人员：苏珊·穆勒，R.SURESHKumarinstuttion：加州大学伯克利分校，华盛顿大学泰勒-库埃特流动中的转变和湍流这是一项关于聚合物诱导对曲线流动中流动转变、湍流和减阻的影响的研究。根据这笔赠款，将采用实验和数值模拟相结合的方法，以提供补充信息，并允许对实验和直接数值模拟结果进行直接、定量的比较。这将产生可靠的建模和模拟工具来描述聚合物链和非线性流动状态之间的相互作用，指导要研究的重要参数范围，洞察在减阻中重要的流动结构和聚合物链结构的类型，并提供关于聚合物诱导湍流减阻机理的定量信息。这项研究将促进对大规模流体输送系统中摩擦控制的理解，并指导将导致减阻的聚合物添加剂的开发。此外，了解聚合物如何引起流体流动和阻力的质和量变化，将有助于开发模仿聚合物的技术，为船舶和潜艇设计节能混合装置和减阻系统，从而节省大量燃料成本。除了节能的潜力外，在微流控设备中的大分子加工领域以及在优化传统聚合物混合和加工操作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-库埃特流的本科生运输实验模块和网站。除了总结研究成果外，该网站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.