Interaction of fluid interfaces with structured solid surfaces

Ajaev，Vladimir S.CBET-0854318该奖项是根据2009年美国复苏和再投资法案(公共法律第111-5条)资助的。这项研究解决了在具有可变形流体界面和结构化固体表面的系统中流体流动现象的建模中的几个问题。后者是最近实验研究的主题，其动机是潜在的应用，从用于化学分析的微流控装置到自清洁表面。然而，小尺度结构的大小和形状对宏观流体流动现象的影响仍不完全清楚，这将是计划中的研究重点。本研究感兴趣的问题包括液滴对超疏水表面的影响，与结构表面接触的薄膜的排水，以及表面结构对倾斜衬底上液滴运动的影响。为了获得对这些现象的基本见解，将计划建立数学模型，利用某些参数的小值，但不依赖于任何特殊假设。新的方程将被用来描述界面处的色散力和电荷对结构固体边界附近流动的影响。理论结果将通过与现有实验数据和作为计划研究一部分进行的新实验的结果进行比较来检验。计划中的项目将通过研究和跨学科的科学合作来促进学习。研究生和本科生都将获得宝贵的研究经验，并通过不仅与PI以及他的实验合作者进行互动，将他们的知识扩展到他们的研究领域之外。与以前由国家科学基金会资助的项目一样，将强调招募少数族裔和妇女。这项计划中的研究还具有广泛的技术影响。计划中的工作的潜在应用包括开发所谓的自清洁表面和微流控技术的进步。

Ajaev, Vladimir S.CBET - 0854318 This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5).This study addresses several issues in modeling of fluid flow phenomena in systems with deformable fluid interfaces and structured solid surfaces. The latter have been the subject of recent experimental studies motivated by potential applications ranging from microfluidic devices for chemical analysis to self-cleaning surfaces. However, the effect of size and shape of the small scale structures on the macroscopic fluid flow phenomena is still not completely understood and will be the focus of the planned studies. The problems of interest for the present study include impact of droplets on superhydrophobic surfaces, drainage of a film in contact with a structured surface, and the effect of surface structuring on the motion of liquid droplets on inclined substrates. To gain fundamental insights into these phenomena, mathematical models will be planned that take advantage of the small values of some parameters but do not rely on any ad hoc assumptions. New equations will be derived to describe the effect of dispersion forces and electrical charges at interfaces on the flow near structured solid boundaries. Theoretical results will be tested by comparison with both existing experimental data and the results of new experiments to be conducted as part of the planned studies. The planned project will promote learning through research and interdisciplinary scientific collaborations. Both graduate and undergraduate students will gain valuable research experience and expand their knowledge beyond their field of study by interacting not only with the PI but also with his collaborators working on experiments. As in the previous NSF-funded projects, the recruitment of minorities and women will be emphasized. The planned research also has broad technological impact. Potential applications of the planned work include the development of the so-called self-cleaning surfaces and advances in microfluidic technology.