2021年11月18日，实验室本学期第九次全英文组会在A8号楼7楼召开，汇报人和汇报主题分别为：

博士研究生：Chunyu Zhang, A better way of cooling with undulated orifice impinging jet. 

Jet impingement cooling has widely been applied due to the superior heat transfer characteristics. Normally, the air flows along the inner wall having a smooth surface before it exits from the orifice exit to form a jet. In this study, we presented a new idea by making the inner surface undulated, aiming to change the impingement heat transfer by altering the jet’s flow structure. The results revealed that, at a small impingement distance, the undulated orifice jet had an improved impingement heat transfer compared with smooth orifice jet.

硕士研究生：Yifan Kong, Flexoelectricity in nano-phononic crystals.

The mechanical behavior of nanoscale dielectrics is very different form the classical dielectric structural behavior. nano dielectrics process a smaller scale and a higher response to external mechanical and electrical stinula. Discription and characteristic the structural behavior of nanoscael structures becomes a hot spot recently. However, experiments and simulations demenstrate that the mechanical and electromechanical coupling behavior are size dependent in nanoscaled structures. Flexoelectric effect is very strong for nano dielectrics, in addition, the strong flexoelectric effect is always coupled with the surface effect and the electrostatic force. These factors, on hand, induced size dependent mechanical and electromechanical coupling behavior, on the other hand, introduced difficulties in solving the boundary vale based govening equations. It is nessesary to develop nanoscaled structure model to incorporate these effects and analysis the mechanical and electromechanical coupling effect in nano dielectrics.Theroretical analysis of the structural behavior of nano scaled structures is of great helpful in design nano structures based sensors and actuators and proposed a reference for simulation and nemeric results.