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讲准字270号:Droplet dynamics on a nanostrcutured superomniphobic surface

发布时间:2019-09-30|浏览次数:

讲座报告主题:Droplet dynamics on a nanostrcutured superomniphobic surface
专家姓名:邱惠和
日期:2019-11-2 时间:14:00
地点:能动学院1419报告厅
主办单位:能源与动力工程学院  

主讲概况:邱惠和,1994年于德国埃尔兰根大学流体力学研究所获得博士学位,现担任香港科技大学机械与航空工程系主任、香港科技大学南沙能源研究所建筑能源研究中心主任。目前担任多个国际期刊的主编/副主编,近年获得诸如365bet体育在线备用网址科技进步奖(SSTPA)、365bet体育在线备用网址教委科技成果奖、飞利浦电子包装技术与高密度包装国际会议优秀论文奖(2012年)、第二届世界机械、化学、材料工程大会(2016年)和第四届传热与流体流动国际会议(2017)最佳论文奖等重要奖项。研究专长包括多相流动和传热、流体动力学、光学诊断、纳米和微流体以及扑翼空气动力学。


主讲内容:In this talk, a bioinspired superomniphobic surface integrating doubly reentrant nanostructures with microcavities is proposed for simultaneously increasing static repellency and dynamic pressure resistance. Novel micro/nano fabrication techniques were developed for fabricating 15μm doubly reentrant micro-cavities, which is the smallest in the world. Static and dynamic wetting experiments were conducted on pillared, doubly reentrant, cavity and the newly developed surfaces under different surface temperatures. It is found that the newly fabricated surface has the shortest contact time in comparison with other superhydrophobic surfaces, which depressed the ice nucleation on the surface below freezing temperature and, therefore, enhance the ability of icephobic. The experimental results show that the newly developed surface can not only successfully suspend the liquid with extremely low surface tension but also can repel droplets with an impact Weber number as high as 103 under a room temperature condition which is twice higher than previous research. Especially, even at -5oC surface temperature, the newly developed surface can still repel droplets under Weber number of 335 while conventional cavity surface failed to repel droplets under the same Weber number at surface temperature -2oC. The mechanism behind the excellent performance of the newly developed surface is analyzed utilizing “air spring effect”, and micro wetting behavior of Laplace Breakthrough on nanostructures. Breakthrough pressure on the novel surface was three times larger than that of the cavity design. It is suggested that this kind nanostructured doubly reentrant cavity surface is promising which has potential applications in anti-icing and biofluid resistance.


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