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UNS: Experimental and Theoretical Investigation of Thin Film Evaporation in Superhydrophobic-Superhydrophilic Hybrid Micro\Nanotextures

UNS：超疏水-超亲水混合微纳米纹理中薄膜蒸发的实验和理论研究

基本信息

批准号：
1550299
负责人：
Jiangtao Cheng
金额：
$ 27.2万
依托单位：
Virginia Polytechnic Institute and State University
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2015
资助国家：
美国
起止时间：
2015-06-15 至 2020-06-30
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1550299&HistoricalAwards=false
关键词：
UNS Experimental Theoretical Investigation Thin

项目摘要

Because liquid evaporation takes away a large amount of heat from a surface, rapid evaporation is desirable. The research team will fabricate new types of surfaces from which thin liquid films can evaporate faster than in a typical boiling process. As a consequence, these surfaces enable removing heat at very high rates which is demanded in many industrial applications. Not only graduate students but also K-12 students from the Dallas area will be involved in this project.Thin film evaporation in capillary wicking structures can potentially yield higher heat transfer rates as compared to those of nucleate boiling. To further enhance the film evaporation heat transfer, the PI proposes to explore a novel avenue with the help of electro-wetting on dielectric (EWOD) to initiate and sustain thin film evaporation in micro/nano porous bi-wick structures decorated on hot spot surfaces. The PI will first develop multi-scale textured surfaces with micro- and nano-scale structures with treatments to make them super-hydrophobic or super-hydrophilic. The EWOD fluidic operations will be used to generate precisely controlled liquid volume on the surface. The project will be concentrated on detecting fluid meniscus distributions and wetting flow dynamics, using micro-PIV (particle imaging velocimetry) on different surface structures to determine the interdependency of the surface texturing on the wicking dynamics and thin film thickness in the presence of high heat fluxes and the effect of surface texturing on heat transfer rates.

因为液体蒸发带走了表面的大量热量，所以快速蒸发是可取的。研究小组将制造新型表面，在这种表面上，薄薄的液体薄膜可以比典型的沸腾过程蒸发得更快。因此，这些表面能够以非常高的速度排出热量，这在许多工业应用中都是必需的。不仅是研究生，还有来自达拉斯地区的K-12学生也将参与到这个项目中。毛细管芯结构中的薄膜蒸发与核态沸腾相比，可能产生更高的传热速率。为了进一步增强薄膜蒸发换热，PI提出了一种新的途径，即利用电介质润湿(EWOD)来启动和维持在热点表面装饰的微/纳米多孔双芯结构中的薄膜蒸发。PI将首先开发具有微米和纳米结构的多尺度纹理表面，并进行处理，使其具有超级疏水或超级亲水。EWOD射流操作将用于在表面产生精确控制的液体体积。该项目将集中于检测流体的半月面分布和润湿流动动力学，使用不同表面结构的微观PIV(粒子成像测速)来确定在高热流密度下表面织构与芯吸动力学和薄膜厚度的相互依赖关系以及表面织构对换热速率的影响。