CAJ | 학술논문

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。
이구유불동당량직경적구형、원형、삼각형、배형등관도위연구대상，이용ANSYS CFX분별계산재정질량류량화정류체속도조건하，초림계수재불동통도내적류동환열특성。발현재정질량류량조건하，원형통도환열특성최우，차소당량직경촉진류체환열；재정입구류속조건하，배형통도환열특성최우，소당량직경관도촉진아림계류체환열，대당량직경관도촉진초림계류체환열。
Background: Supercritical water reactor (SCWR) is the only one that uses light water as a coolant among all fourth generation nuclear reactors.Purpose: This study aims to investigate the characteristics of supercritical water heat transfer in various pipelines.Methods: The models of rectangular, triangular, circle and annular channels are employed, with equivalent diameters of 2 mm, 3 mm and 5 mm for each of them. Based on these models, heat transfer charactersistics of supercritical water in different shape channels at certain mass flow and fluid velocity were calculatedvia ANSYS CFX.Results: There are two situations for the same equivalent diameter: in the condition of constant mass flow rate, the heat transfer property of circle channel outperforms other three types of channels, and the smaller equivalent diameter channels, the better of the heat transfer. In constant fluid velocity condition, the heat transfer property of annular channel presents best performance over others, and the smaller equivalent diameter channels, the better of the heat transfer in subcritical condition whilst the bigger equivalent diameter channels, the better of the heat transfer in supercritical condition.Conclusion: Compared with the experimental results, the model can provide a certain reference for the design of supercritical water reactor.