Dynamics of Surfactant-Influenced Gas/Liquid Interfaces

摘要 提案编号：CTS 9803478、CTS 9803683 主要研究者：Hirsa/洛佩斯 这是一项研究受表面活性剂影响的气/液界面的固有性质的资助。 该计划将利用新开发的表面化学和界面流体力学的非侵入性光学技术。 这些属性将被直接测量并纳入从第一原理推导出的控制方程中，而不需要唯象建模。 一个集中的，跨学科的研究工作，结合问题的理论制定，表面化学和流体动力学实验和测量，以及数值模拟为界面流动动力学领域可能的重大突破奠定了基础。 表面活性剂流体动力学的应用是多样的，并且包括材料（例如塑料）和食品加工、燃料喷射喷雾和雾化、两相流、穿过海洋表面的CO2运输和肺表面活性剂治疗。 此外，新的表面活性剂的开发可以受益于所提出的项目的结果，从改进的方法来测量固有的界面性质。 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式。 本项目的目的是阐明内在的界面性质，包括表面粘度（剪切和反相）和运输动力学的作用，通过一个机械配方的散装和界面运输过程。 这将是一个简单的，可重复的，稳态流场，使用实验在环形通道流（深槽粘度计）。 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