Dynamic Wetting Failure and Air Entrainment in Surfactant Solutions

表面活性剂溶液中的动态润湿失效和空气夹带

• 批准号: 1434016
• 负责人: Satish Kumar
• 金额: $ 30万
• 依托单位: University of Minnesota-Twin Cities
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2014
• 资助国家: 美国
• 起止时间: 2014-09-01 至 2019-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1434016&HistoricalAwards=false
• 关键词: Dynamic; Wetting; Failure; Air; Entrainment

Kumar 1434016This research is focused on exploring dynamic wetting, which is the displacement of some fluid (for example, air) initially in contact with a solid surface by a liquid that advances over the surface. In coating processes the receding fluid is air, and its entrainment into the liquid can be catastrophic since stringent control of coating uniformity is required to ensure product integrity. Indeed, the onset of dynamic wetting failure remains one of the primary obstacles to improving upon current manufacturing speeds for products that require liquid-applied coatings. This is a proposal with a clear path for fundamental understanding to practical applications with economic impact. Understanding wetting failure, a process that is quite common in manufacturing materials with coatings, can have an impact in the coating industry.This is a proposal to study the failure of the wetting process when surfactant molecules are present in the liquid. While recent work considers Newtonian liquids without any surfactants, in practice most coating liquids do contain surfactants. However, despite the importance of surfactants in coating processes, there is little fundamental understanding of how surfactants influence dynamic wetting failure and air entrainment. The objective of this proposal is to advance this understanding using a combination of theory and experiment.

Kumar 1434016这项研究的重点是探索动态润湿，这是一些流体（例如，空气）最初与固体表面接触的液体在表面上前进的位移。在涂覆过程中，后退流体是空气，并且其夹带到液体中可能是灾难性的，因为需要严格控制涂覆均匀性以确保产品完整性。实际上，动态润湿失效的开始仍然是改善需要液体施加涂层的产品的当前制造速度的主要障碍之一。这是一个具有明确路径的建议，可以从根本上理解具有经济影响的实际应用。了解润湿失效，这是一个在涂层材料制造中非常常见的过程，可能会对涂层行业产生影响。这是一个研究液体中存在表面活性剂分子时润湿过程失效的建议。 虽然最近的工作认为牛顿液体没有任何表面活性剂，但实际上大多数涂料液体确实含有表面活性剂。然而，尽管表面活性剂在涂层工艺中的重要性，但对表面活性剂如何影响动态润湿失效和空气夹带几乎没有基本的了解。本提案的目的是通过理论和实验相结合来推进这一理解。