Numerical Simulation of Heat Transfer Characteristics of Supercritical Water in 2×2 Bundles

Complex channel lies between the typical channel and the typical cell,and is closer to the original rod bundles in channel shape and heated conditions.In this study,numerical simulations with CFD tools has been done to the 2×2 rod bundles.The heat transfer characteristics were analyzed and the impact of heat flux and mass flux was discussed as well.It was found that the increased mass flux or decreased heat flux will contribute to the improvement of the heat transfer capability.The wall temperature was non-uniform along the circumferential direction and the heat conduction of the solid wall may help impair this non-uniformity.