The convective flow and heat transfer characteristics of supercritical carbon dioxide cooling in various inclined spirally fluted tubes, which is used under high pressure conditions for power plants, are investigated by numerical simulation in this study. Using the examined computational model, the distributions of the turbulent kinetic energy and the fluid velocity in each side of the groove varied with the inclination angles δ range from −90° to 90° are analyzed. The results show that the components of the buoyancy force in the mainstream and perpendicular to the mainstream have different effects on the flow behavior, especially near the cooling surface. The variation of the local heat transfer coefficient is also issued. In the gas-like region, the fluid velocity plays the main role, and the heat transfer coefficient increases with the decreasing δ. In the liquid-like region, the dominant impact factor is the velocity gradient, and the variation of the heat transfer coefficient with δ is opposite to that in the gas-like region, where the buoyancy has a more significant effect. The buoyancy effect will be more important with the increase of the helix angle and increase as the inclined upward flow. The optimal inclination angle corresponding to the maximum heat transfer coefficient is obtained, and it varies from −45° to 45° as the helix angle increases.

通过数值模拟研究了高压条件下发电厂使用的各种倾斜螺旋槽管中超临界二氧化碳冷却的对流流动和传热特性。使用检查的计算模型，槽的每一侧的湍动能和流体速度的分布随倾角δ而变化。分析了从-90°到90°的范围。结果表明，主流和垂直于主流的浮力分量对流动行为的影响不同，尤其是在冷却表面附近。还发布了局部传热系数的变化。在气态区域中，流速起主要作用，并且传热系数随着δ的减小而增加。在液状区域中，主要影响因素是速度梯度，传热系数随δ的变化。与气态区域相反，气态区域的浮力作用更大。浮力作用将随着螺旋角的增加而变得更重要，并随着倾斜向上的流动而增加。获得了与最大传热系数相对应的最佳倾斜角，并且随着螺旋角的增加，该最佳倾斜角在-45°至45°之间变化。