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以具有不同当量直径的矩形、圆形、三角形、环形等管道为研究对象,利用ANSYS CFX分别计算在定质量流量和定流体速度条件下,超临界水在不同通道内的流动换热特性。发现在定质量流量条件下,圆形通道换热特性最优,且小当量直径促进流体换热;在定入口流速条件下,环形通道换热特性最优,小当量直径管道促进亚临界流体换热,大当量直径管道促进超临界流体换热。
Taking rectangular, circular, triangular and annular pipes with different equivalent diameters as the research object, the flow heat transfer characteristics of supercritical water in different channels under constant mass flow rate and constant fluid velocity were respectively calculated by ANSYS CFX. It is found that under constant mass flow conditions, the circular tunnel has the best heat transfer characteristics and small equivalent diameter to promote fluid heat transfer. Under the condition of fixed inlet flow velocity, the circular tunnel has the best heat transfer characteristics and the small equivalent diameter pipeline promotes subcritical fluid change Thermal, large equivalent diameter pipe to promote the supercritical fluid heat transfer.