主    办：爆炸科学与技术国家重点实验室

  安全与防护协同创新中心

报告题目：Dynamics of impacting and floating Leidenfrost drops

报 告 人：孙超  教授

  清华大学

时    间：2018年11月22日下午14:00

地    点：北京理工大学3号教学楼146会议室

报告人简介：

Chao Sun is Professor at the Center for Combustion Energy and the Department of Energy & Power Engineering at Tsinghua University. He obtained his PhD from the Chinese University of Hong Kong in 2006. In 2009, he was appointed as an Assistant Professor at the University of Twente, and in 2013, promoted to a tenured Associate Professor. In 2015, he moved to Tsinghua University as a Full Professor. His research interests include multiphase flows, high-Reynolds number turbulence, bubbles and droplets, and heat and mass transfer. He serves as an Associate Editor of ‘International Journal of Multiphase Flow’

报告摘要：

Heat transfer from solid surfaces to liquid droplets plays an important role in many industrial technologies such as power electronics cooling, spray cooling, engine performance, and pollutant emissions. 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, or without any surface contact forms a Leidenfrost vapor layer towards the hot surface and bounces back. We study the dynamics of the thin vapor layer (around 100 nm) between an impacting droplet and the superheated surface, and investigate how the boiling dynamics of the droplet change with impact inertia and substrate properties. We find that the whole impact dynamics is largely determined by the dimple and neck formation beneath the droplet at the very beginning of the impacting process. Additionally, we also study the final fate of a Leidenfrost droplet.