Numerical Simulation of Supercritical Water Heat Transfer Characteristics in Annular Channel

A numerical simulation was carried out to study the heat transfer characteristics of supercriti-cal water in annular channel using CFX 11.0.Wall temperature and heat transfer coefficient variation trends in smooth annular channel were compared with those in annular channel with ribs.The shape,height,distance and thickness of ribs were studied as the important influence factors on heat transfer of supercritical water in this paper.The results show that local heat transfer enhancement occurs near ribs.It also can be found that the effect of rib shape on heat transfer is negligible.Increasing the ribs height and decreasing the ribs distance are good for improving heat transfer in a certain range.The effect of rib width on heat transfer is also negligible in a certain range.