Channel Flow of Homogeneous Electrorheological Fluids

安妮特·D Shine，特拉华大学提案#0085026均匀电流变流体的通道流在这项研究中，基于液晶聚合物（LCP）的均匀电流变（ER）流体在狭窄分离的电极之间的压力驱动流动中进行实验表征。 这项工作的目的是开发一个定量的了解均匀的电流变流体在复杂的流动几何形状，以评估在传统和微流体应用中使用的流体的技术可行性。该项目的范围包括三个部分：（1）LCP的合成，（2）LCP溶液的ER行为的实验表征和定量机理建模，以及（3）LCP溶液在简单和复杂制造通道中的测试。聚异氰酸正己酯（PHIC）是通过活性、可逆聚合来合成的，以产生各种分子量的单分散样品。PHIC的浓溶液的粘度的实验特征在于在一个范围内的剪切速率和电场强度，并与先前开发的二维版本的土井的LCP流变学的分子理论建模。 稳态和瞬态压降测量在恒定流量进行圆形入口通道。特殊的微电极制造的电子束光刻在一个重叠的图案，以指导二维平面ER流体流动在规定的方式通过选择性的电极通电。 这项工作将允许，在50年的电流变流体研究的第一次，从流体成分的属性的电流变行为的完整的先验预测。 这种预测能力将ER流体配方与ER器件设计联系起来，使得严格的工程分析可以确定使用均质ER流体可以实现ER器件的估计潜在十亿美元市场的哪一部分。

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.