Channel Flow of Homogeneous Electrorheological Fluids

均质电流变流体的通道流动

• 批准号: 0085026
• 负责人: Annette Shine
• 金额: $ 20.99万
• 依托单位: University of Delaware
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-09-15 至 2005-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0085026&HistoricalAwards=false
• 关键词: Channel; Flow; Homogeneous; Electrorheological; Fluids

Annette D. Shine, University of DelawareProposal #0085026Channel Flow of Homogeneous Electrorheological Fluids In this research, homogeneous electro-rheological (ER) fluids based on liquid crystalline polymers (LCPs) are characterized experimentally in pressure-driven flow between narrowly separated electrodes. The objective of this work is to develop a quantitative understanding of homogeneous ER fluids in complex flow geometries, in order to assess the technical feasibility of using the fluids in conventional and microfluidic applications. The project scope consists of three parts: (1) synthesis of the LCP, (2) experimental characterization and quantitative mechanistic modeling of the ER behavior of LCP solutions, and (3) testing of the LCP solutions in simple and complex fabricated channels.Poly(n-hexyl isocyanate) (PHIC) is synthesized by living, reversible polymerization to produce monodisperse samples various molecular weights. The viscosity of concentrated solutions of PHIC is experimentally characterized over a range of shear rates and electric field strengths, and modeled with a previously developed two-dimensional version of Doi's molecular theory of LCP rheology. Steady state and transient pressure drop measurements at constant flow rate are conducted in rounded-entry channels. Special micro-electrodes are fabricated by electron beam lithography in an overlay pattern in order to direct two-dimensional planar ER fluid flow in a prescribed fashion by selective electrification of electrodes. This work will allow, for the first time in 50 years of ER fluid research, the complete a priori prediction of ER behavior from the properties of the fluid components. This predictive capability links ER fluid formulation with ER device design, so that rigorous engineering analysis can identify which fraction of the estimated potential billion dollar market for ER devices can be realized using homogeneous ER fluids.

Annette D.Shine，DelawareUniversity#0085026均匀电流变流体的通道流动在本研究中，基于液晶聚合物(LCP)的均匀电流变(ER)流体在窄间隙电极之间的压力驱动流动中被实验表征。这项工作的目的是发展对复杂流动几何结构下的均质电流变流体的定量理解，以评估在常规和微流体应用中使用这种流体的技术可行性。项目范围包括三个部分：(1)液晶聚合物的合成，(2)液晶聚合物溶液电流变行为的实验表征和定量机理模拟，(3)液晶聚合物溶液在简单和复杂制造通道中的测试。聚异氰酸正己酯(PHY)是通过活性、可逆聚合合成的单分散样品。在一定的剪切速率和电场强度范围内，对PHY浓缩液的粘度进行了实验表征，并用先前开发的二维DOI的LCP流变学分子理论进行了模拟。在圆形进水通道中进行了定常流量下的稳态和瞬变压降测量。特殊的微电极是通过电子束光刻在覆盖图案中制造的，目的是通过电极的选择性通电来引导二维平面电流变流体以规定的方式流动。这项工作将使电流变流体研究50年来第一次能够根据流体组分的性质对电流变行为进行完整的先验预测。这种预测能力将电流变液配方与电流变设备设计联系起来，因此严格的工程分析可以确定使用均质电流变液可以实现电流变设备估计的10亿美元潜在市场的哪一部分。