化工进展2018，Vol.37Issue(3)：906-912,7.DOI:10.16085/j.issn.1000-6613.2017-1281
液滴撞击高温梯度表面的动态行为特性
Dynamic behavior of droplets impact on a hot microstructured surface with wetting gradient
摘要
Abstract
Using copper plates as substrates,the microholed gradient surface was fabricated by the optical etching,and dynamic behaviors of droplets impact on the high temperature microholed gradient surface were studied by high-speed camera. The results showed that when a droplet impacts on the microholed gradient surface,there are five different impact modes. They are wetting mode,contact boiling mode,transition mode,explosion mode and rebound mode. When surface temperature reached Leidenfrost point,the droplet is in the rebound mode and it appears continues rebound behavior along the direction of the wetting gradient. Due to the energy reducing continues in rebound process,the rebound height gradually reduces to zero. Based on surface physical and chemical theories,the directional bouncing behavior of the droplet was analyzed. In addition,the dynamic characteristics of the droplet rebound were analyzed by using image processing technology. Moreover,the rebound height,the spreading factor and the horizontal acceleration of the droplet were discussed by experiments. It was found that they have same characteristics with the increase of rebound numbers. It experienced the same stages:rapid reducing at acceleration. The spreading factor were highly consistent with the theoretical analysis.关键词
液滴/撞击/浸润梯度/定向反弹/韦伯数Key words
droplet/impact/wetting gradient/directional rebound/Weber number分类
能源科技引用本文复制引用
罗黎明,贾志海..液滴撞击高温梯度表面的动态行为特性[J].化工进展,2018,37(3):906-912,7.基金项目
国家自然科学基金项目(51676130,51176123). （51676130,51176123）
