Effect of Guide Vane on Pressure Loss and Heat Transfer Characteristics of Supercritical CO 2 in U-Shaped Channel

U-shaped channel is a common unit structure in heat exchanger. The pressure loss and heat transfer characteristics of U-shaped channel have important influence on the comprehensive performance of heat exchanger. In this paper, combined with the thermo-physical property of supercritical CO 2 (SCO 2 ), the influence of the guide vanes on the pressure loss and heat transfer characteristics of SCO 2 in U-shaped channel was studied numerically. The four different guide vanes included integral guide vane, two-stage symmetric guide vane, two-stage asymmetric guide vane and discrete guide vane. CO 2 Real Gas Property file (RGP) was imported into ANSYS CFX commercial software for calculation, and the turbulence model was SST k − ω . At the same time, the influence of different inlet Reynolds numbers and heating conditions of channel wall were also studied.