Collaborative Research: The Role of Monolayer Structure on Interfacial Hydrodynamics

合作研究：单层结构对界面流体动力学的作用

• 批准号: 0340768
• 负责人: Amir Hirsa
• 金额: --
• 依托单位: Rensselaer Polytechnic Institute
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2004
• 资助国家: 美国
• 起止时间: 2004-07-01 至 2007-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0340768&HistoricalAwards=false
• 关键词: Collaborative; Research; Role; Monolayer; Structure

ABSTRACTPROPOSAL NO.: CTS-0340768 AND 0340736PRINCIPAL INVESTIGATORS: AMIR H. HIRSA AND JUAN M. LOPEZINSTITUTION: RENSSELAER POLYTECHNIC INST./ARIZONA STATE UNIVERSITY THE ROLE OF MONOLAYER STRUCTURE ON INTERFACIAL HYDRODYNAMICSThe goal of this research program is to advance fundamental understanding of surfactant monolayer hydrodynamics. Applications of monolayer hydrodynamics are numerous. Technology examples include material and food processing, liquid atomization, and coating systems. An example of a natural system dominated by monolayer hydrodynamics is the lung. In the absence of surfactant monolayers, the surface tension of the aqueous film covering the lung tissue would close the passages and make respiration impossible. This research is intended to provide fundamental insight into the nature of interfacial hydrodynamics by developing new theories, and numerical and experimental techniques to test these theories. In particular, the role of monolayer mesoscale structure on interfacial transport processes will be elucidated, as will the effect of flow on the monolayer structure. Use of simple constitutive relations in interpreting experimental data in the past has led to the conclusion that many monolayers have an apparent negative surface dilatational viscosity. This is not physically consistent with the second law of thermodynamics. In this project, contributions from non-equilibrium monolayer concentration and phase morphology will be considered, and these may provide an explanation for the observed enigma of apparent negative surface dilatational viscosity. This issue is of fundamental significance and will have a broad impact on a wide range of fields as the drive to miniaturization leads to small-scale open fluidic systems in which the viscous contributions to the interfacial stresses dominate over the elastic contributions. Better understanding of monolayers is expected to have a significant impact on the industrial and biomedical communities working on designer surfactant monolayers. Also, the multidisciplinary nature of this project will provide an excellent opportunity to educate graduate and undergraduate students in both science and engineering.*co-funded jointly by the Fluid Dynamics & Hydraulics, and Interfacial, Transport and Thermodynamics programs, and Math Sciences Priority Area.

摘要提案编号： CTS-0340768和0340736主要制造商：AMIR H.作者声明：HIRSA and JUAN M. Lopezinstitution： RENSSELAER POLYMERIZONIC®./亚利桑那州立大学单层结构对界面流体力学的作用本研究项目的目标是促进对表面活性剂单层流体力学的基本理解。 单层流体力学的应用是众多的。 技术实例包括材料和食品加工、液体雾化和涂层系统。由单层流体动力学控制的自然系统的一个例子是肺。在没有表面活性剂单层的情况下，覆盖肺组织的水膜的表面张力将关闭通道并使呼吸不可能。 本研究旨在通过发展新的理论，以及测试这些理论的数值和实验技术，为界面流体动力学的本质提供基本的见解。 特别是，单层介观结构的界面传输过程中的作用将得到阐明，将流动的单层结构的效果。 在解释实验数据的简单本构关系的使用在过去已经导致的结论是，许多单分子膜有一个明显的负表面粘性。 这在物理上与热力学第二定律不一致。 在这个项目中，从非平衡单层浓度和相形态的贡献将被考虑，这些可能会提供一个解释所观察到的谜的表观负表面粘性。这个问题是具有根本意义的，并将有广泛的影响，在广泛的领域的驱动器，以小型化导致小规模的开放式流体系统，其中的粘性贡献的界面应力占主导地位的弹性贡献。 更好地了解单分子膜，预计将有显着的影响，工业和生物医学界的工作设计表面活性剂单分子膜。 此外，该项目的多学科性质将提供一个极好的机会，教育研究生和本科生在科学和工程。由流体动力学水力学、界面、运输和热力学项目以及数学科学优先领域共同资助。&