报告题目：When Push Would Help
—— A message from the turbulent convection under spatial confinement
报 告 人：南方科技大学 黄仕迪副教授
邀 请 人：郗恒东教授
It is well known that a certain degree of stress or constraint can make people perform better and yield higher productivity; however, over-stress or too much constraint can lead one collapse down and perform poorly. Interestingly, similar phenomenon was observed in a turbulent system under spatial confinement. This system is calledRayleigh-Bénard convection, an idealized model for studying general convection phenomena in nature and industrial applications. Based on the classical picture of heat transport, if one would like to enhance the heat transfer efficiency, it is preferred to make the flow stronger and faster. In this talk, I will show that how heat transport can be significantly enhanced by using a simple spatial-confinement approach, despite that the overall flow is slowed down greatly. In this newly-discovered regime, both the global heat transport and the local temperature profiles exhibit universal properties, which are originated from the structure of the elementary heat carrier in the system. By examining the mechanism of the above phenomenon and making an interesting analogy, a message for that "when push would help to improve one's performance" is implied.