Collaborative Research: Interfacial Instability, Convective Motion and Heat Transfer in Evaporating Films

合作研究：蒸发膜中的界面不稳定性、对流运动和传热

• 批准号: 0651755
• 负责人: James Hermanson
• 金额: $ 25万
• 依托单位: University of Washington
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2007
• 资助国家: 美国
• 起止时间: 2007-04-01 至 2011-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0651755&HistoricalAwards=false
• 关键词: Collaborative; Research; Interfacial; Instability; Convective

Collaborative Research: Interfacial Instability, Convective Motionand Heat Transfer in Evaporating FilmsUniversity of Washington and Michigan Technological University This program will study the behavior of thin, evaporating films. Of specific interest are the disturbances at the fluid surface and the fluid motion within the film caused by evaporation, and how these disturbances impact the film structure and the heat transfer. Key considerations in these films include buoyancy, differences in surface tension, and mass loss due to evaporation. The action of these mechanisms will be systematically studied by varying the conditions of the experiment, including the fashion in which the heat is supplied to the evaporating film. Experiments will be conducted using pure test fluids in a pressure-regulated test cell. Films with different thermal conditions will be studied by varying both the magnitude of the temperature difference across the film, as well as changing the direction of this temperature difference. Each thermal boundary condition will yield different temperature profiles within the film, with different impacts on the fluid motion within the film. The evaporating films will be studied by high-speed imaging, measurement of the temperature within the films and the heat transfer at the wall, and ultrasonic measurements of the film thickness. The behavior of evaporating films will also be examined using linear stability theory. This research is expected to lead to an improved understanding of fundamental evaporation processes. Two very important practical applications of this research are the growth of crystals in semiconductor materials and the texturing of surfaces in magnetic storage devices. The proposed research will also impact the education, recruiting, and outreach programs at the University of Washington (UW) and Michigan Technological University (MTU). For example, the ultrasound and diagnostic technique will be introduced into existing primary experimental methods courses in Aeronautics and Astronautics at the UW.

协作研究：华盛顿和密歇根州技术大学蒸发膜的界面不稳定性，对流运动和热传递，该计划将研究薄薄的，蒸发的电影的行为。 特定感兴趣的是流体表面的干扰以及蒸发引起的膜中的流体运动，以及这些干扰如何影响膜结构和传热。 这些电影中的主要考虑因素包括浮力，表面张力的差异以及由于蒸发而引起的质量损失。 这些机制的作用将通过改变实验条件，包括将热量提供给蒸发膜的方式来系统地研究。实验将使用压力调节的测试电池中的纯测试液进行。 通过改变整个膜的温度差的大小以及改变该温度差的方向，可以研究具有不同热条件的膜。 每个热边界条件将在膜内产生不同的温度轮廓，对膜内的流体运动产生不同的影响。 蒸发膜将通过高速成像，膜中温度的测量以及壁上的传热以及膜厚度的超声测量来研究。 还将使用线性稳定性理论来检查蒸发膜的行为。 预计这项研究将导致人们对基本蒸发过程的了解。 这项研究的两个非常重要的实际应用是半导体材料中晶体的生长以及磁性存储设备中表面的纹理。 拟议的研究还将影响华盛顿大学（UW）和密歇根大学技术大学（MTU）的教育，招募和外展计划。 例如，UW的超声和诊断技术将被引入现有的航空航天和宇航学方面的现有主要实验方法课程中。