报告题目：Drop impact on unheated and superheated surfaces

报 告 人：孙超, 金沙总站6165地址燃烧能源中心和热能工程系

报告时间：2015年11月12日16：00

报告地点：理科楼郑裕彤大讲堂

报告摘要：Drop impact on solid surfaces, aside from its inherent beauty, plays an important role in industrial processes as diverse as ink-jet printing, spray cooling, and spray coating. The impacting drop deforms before making contact with the target surface, and an air layer is formed between the droplet base and the solid surface. Using high-speed color interferometry, we study the dynamics of the air layer, the wetting mechanism and bubble entrapment. When a liquid droplet impacts on a surface heated above the liquid's boiling point, the droplet either immediately boils when it contacts the surfaces (contact boiling), or without any surface contact forms a Leidenfrost vapor layer towards the hot surface and bounces back (film boiling). We investigate how the boiling dynamics of the impacting droplet change with impact inertia and substrate properties.