Dynamics of Surfactant-Influenced Gas/Liquid Interfaces

摘要建议编号：CTS 9803478，CTS 9803683首席研究员：Hirsa/Lopez这是一项研究表面活性剂影响的气/液界面本征性质的拨款。该计划将利用新开发的非侵入性光学技术来进行表面化学和界面流体动力学研究。这些性质将被直接测量并合并到从第一原理导出的控制方程中，而不需要现象学建模。结合了问题的理论表述、表面化学和流体动力学实验和测量以及数值模拟的有重点的、跨学科的研究努力为界面流动动力学领域可能的重大突破奠定了基础。表面活性剂流体力学的应用是多种多样的，包括材料(例如塑料)和食品加工、燃油喷射和雾化、两相流、二氧化碳在海洋表面的传输以及肺表面活性物质治疗。此外，新表面活性剂的开发也可以从拟议项目的结果中受益，因为改进了测量内在界面性质的方法。这些测量能力与预测模型相结合，可以将表面活性剂材料的设计从试错过程转变为基于力学原理的系统设计范例。这个项目的目的是通过一个机械公式来阐明内在的界面性质，包括表面粘度(膨胀和剪切)和传输动力学，对整体和界面传输过程的作用。这将通过一种简单的、可重复的、稳态的流场来完成，使用的是环槽流动(深槽粘度计)中的实验。1 1

Abstract Proposal Number: CTS 9803478, CTS 9803683 Principal Investigator: Hirsa/Lopez This is a grant to study the intrinsic properties of surfactant-influenced gas/liquid interfaces. The program will capitalize on newly developed non-invasive optical techniques for surface chemistry and interfacial hydrodynamics. These properties will be measured directly and incorporated into the governing equations that are derived from first principles without the need for phenomenological modeling. A focused, interdisciplinary research effort incorporating the theoretical formulation of the problem, surface chemistry and hydrodynamic experimentation and measurement, and numerical simulation set the stage for a possible major breakthrough in the field of interfacial flow dynamics. Applications of surfactant hydrodynamics are diverse and include material (e.g. plastics) and food processing, fuel injection spray and atomization, two-phase flow, C02 transport across the ocean surface, and pulmonary surfactant therapy. Also, the development of new surfactants can benefit from the results of the proposed project from improvements in the methodology to measure the intrinsic interfacial properties. These measurement capabilities coupled with the predictive model can shift the design of surfactant materials from a trial-and-error process to a systematic design paradigm based on the principles of mechanics. The aim of this project is to elucidate the role of intrinsic interfacial properties, including surface viscosities (dilatational and shear) and transport kinetics, on the bulk and interfacial transport processes through a mechanistic formulation. This will be accomplished with a simple, reproducible, steady-state flow field, using an experiment in an annular channel flow (the deep-channel viscometer). 1 1