Numerical Simulation Study on Supercritical Natural Circulation Flow and Heat Transfer in Narrow Rectangular Channels

When the model of natural circulation in vertical rectangular channels with gap 1 mm was created, considering the character of supercritical water, the distribution of fluid velocity, temperature and density were obtained with the help of ANSYS CFX. The conclusion is that supercritical density is much lower than that of subcritical water in this study parameter and that the heat transfer ability of supercritical water is higher than that of subcritical water. Futuremore, narrow rectangular channels contribute supercritical fluid to transfer heat, which lay the foundation of accurate supercritical thermal engineering calculation.