Xianliang Lei

State Key Laboratory of Multiphase Flow in Power Engineering, 

Xi’an Jiaotong University, China

Email:xianlianglei@xjtu.edu.cn

Dr. Xianliang Lei is now an associate professor, a director of High Temperature and High Pressure Multiphase Flow Research Institute in the State Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University, China. 

He obtained his B.E and PhD in Power engineering and Engineering Thermophysics from  Xi’an Jiaotong University. And He was previously visited the department of nuclear engineering, North Carolina State University, USA as an visiting scholar. His current research topics include heat and mass transfer of supercritical fluids, numerical simulation of two-phase flow, boiler hydrodynamics. In recent years, he has published over 80 international journal papers and/or conference presentations, he is also chairs many high-level research projects.

Title: Heat and Mass Transfer, Flow Instability of Carbon Dioxide in the sub/supercritical  regions 

Abstract:  Advanced supercritical carbon dioxide (S-CO2) Brayton cycle meets the need of power generation with high efficiency and compactness design, which is considered as one of the most promising power generation cycles. The understanding of heat transfer characteristics and Flow Instability to carbon dioxide in the heating devices are significant for the optimization design and safe operation of S-CO2 Brayton cycle. 

The talk includes two parts, firstly, the abnormal heat transfer characteristics of CO2 in the circular smoothed vertical/horizontal and straightly-ribbed channels will be introduced, and the corresponding heat transfer mechanism in heat transfer deterioration regimes and enhanced regimes will be discussed, a modified predicting methods for HTD have been proposed. Secondly, the flow instability of CO2 in parallel vertically channels at high heat fluxes is experimentally studied. The influences of thermodynamic parameters on the flow instability are further discussed, a model for predicting the threshold heat flux under different pressure conditions is proposed.