Model Evaluation and Numerical Analysis of Supercritical Water Heat Transfer Deterioration in Circular Tubes

This paper presents a numerical simulation of the heat transfer deterioration of supercritical water in circular tubes,and evaluates the validity and reliability of the existing CFD model under super-critical condition.The calculation indicates that when the heat transfer deterioration occurs at low mass flux condition,the velocity profile behaves M shaped in the radial direction,and at the place of maximum velocity,the turbulent kinetic energy decreases evidently.At high mass flux condition,the result shows that the varia-tion of thermal conductivity have great effect on the heat transfer.The mode evaluation indicates that SST mode can be used to calculate the heat transfer deterioration at high mass flux conditions.