“大师面对面”—流体力学讲座-Self-sustained biphasic catalytic particle turbulence
报告题目：Self-sustained biphasic catalytic particle turbulence
报告人简介：Chao Sun is a Professor at the Center for Combustion Energy, the Department of Energy and Power Engineering, and the School of Aerospace Engineering at Tsinghua University. He obtained his PhD from the Chinese University of Hong Kong in 2006, and in the same year, received the Hong Kong Young Scientist award.
In 2009, he was appointed as an Assistant Professor at the University of Twente, and in 2013, promoted to an Associate Professor. In 2015, he joined Tsinghua University as a Full Professor. His research interests include multiphase flows, high-Reynolds number turbulence, bubbles and droplets, and heat and mass transfer. Dr. Sun serves as an associate editor of ‘International Journal of Multiphase Flow’, an editorial advisory board member of ‘Experiments in Fluids’ and a governing board member of the international conference on multiphase flow.
内容简介：Turbulence is known for its ability to vigorously mix fluid and transport heat. While over a century of research effort has been devoted to heat transport enhancement, few have exceeded the inherent limits posed by turbulent-mixing. Here we have conceptualized an “active particle” turbulence machine: we find that by adding a minute concentration of a heavy liquid (hydrofluoroether) to a water-based turbulent convection system, remarkably, highly efficient biphasic dynamics is born, which supersedes turbulent heat transport by up to 500%. The system is unique in that it operates on a self-sustained dynamically equilibrated cycle of a “catalyst-like” species, and exploits several heat-carrier agents including pseudo-turbulence, latent heat and bidirectional wake capture. We find that the heat transfer enhancement is dominated by the kinematics of the active elements and their induced-agitation. The present finding opens the door towards the establishment of tunable, ultra-high efficiency heat transfer/mixing systems.