Experimental and Computational Analysis of fluidic interfaces influenced by soluble surfactant

可溶性表面活性剂影响流体界面的实验和计算分析

• 批准号: 167364694
• 负责人: Professor Dr. Dieter Bothe
• 金额: --
• 依托单位: Arbeitsbereich Mathematische Modellierung und Analysis (MMA)
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2010
• 资助国家: 德国
• 起止时间: 2009-12-31 至 2013-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/167364694?language=en
• 关键词: Experimental; Computational; Analysis; fluidic; interfaces

Surfactants are essential ingredients in many technological processes such as foaming or emulsification. Due to their amphiphilic character they assemble at fluidic interfaces and modify the respective interfacial properties. Since these interfaces are moving and are continuously deformed and expanded, the local instantaneous interfacial tension is a most relevant parameter. In order to obtain a deeper quantitative understanding of such processes with soluble surfactant, this proposal has two general objectives: By means of experimental analysis, employing tools recently developed at the Golm side, complete knowledge of basic adsorption properties for selected homologous series of surfactants at liquid/liquid interfaces will be obtained, performing studies with continuously growing drops and with transient and harmonic perturbations of drops. Since a direct measurement of surfactant distribution lateral at the interface is not possible, a numerical method for the simulation of two-phase Navier-Stokes flows with full resolution of the interface dynamics accounting for the influence of soluble surfactants is highly desired. The development of such a method is proposed here, building on recent preliminary work on the Darmstadt side. While the experimental measurements will provide the parameters required for meaningful simulations, the computational analysis will especially clarify the 3D hydrodynamics in the experiments. Together, the demanded quantitative understanding will be obtained and used to improve and validate simplified models.

表面活性剂是许多工艺过程中的基本成分，如发泡或乳化。由于它们的两亲性，它们在流体界面上组装，并改变各自的界面性质。由于这些界面是移动的，并且不断变形和扩展，局部瞬时界面张力是一个最相关的参数。为了更深入地定量了解可溶性表面活性剂的这一过程，这一建议有两个总体目标：通过实验分析，利用最近在Golm方面开发的工具，将获得选定的同系物表面活性剂在液/液界面上的基本吸附性质的完整知识，进行液滴持续增长以及液滴的瞬时和简谐扰动的研究。由于不可能直接测量表面活性剂在界面上的横向分布，因此迫切需要一种能够完全分辨界面动力学的数值方法来模拟两相N-S流动。在达姆施塔特方面最近的初步工作的基础上，这里提出了这种方法的发展。虽然实验测量将提供有意义的模拟所需的参数，但计算分析将特别阐明实验中的三维流体力学。在一起，将获得所需的定量理解，并用于改进和验证简化模型。