Heat transfer to supercritical water in a smooth tube with an inclined angle of 25° was investigated experimentally and numerically. Experimental results show that the increase of mass flux improves the heat transfer. As the pressure increases, influence of physical property variation to the heat transfer becomes gentle. Thereby, the increase of pressure reduces the heat transfer under an enhanced condition. Dimensionless buoyancy parameters Gr_q*/Gr_qth and ${\overline{Gr}/Re}^{2.7}$ are compared on the basis of experimental results. The evaluated result shows that Gr_q*/Gr_qth is applicable to the inclined tube flow. Base on the supercritical data, a new heat transfer correlation is proposed. Numerical analysis was completed with the shear stress transport k-ω model. Corresponding results show that the influence of variable mass flux and pressure on supercritical heat transfer is realized by changing radial distributing characteristics of turbulence and physical property. The increase of mass flux improves the radial turbulence and heat-absorbing capacity of the boundary fluid, so the supercritical heat transfer is enhanced. At a low mass flux condition where heat transfer reduction occurs, the increase of pressure improves the heat transfer. At a high mass flux condition where heat transfer enhancement occurs, the increase of pressure reduces the heat transfer. Influence of natural convection caused by the buoyancy leads to the occurrence of heat transfer disparity between top and bottom sides of the inclined tube. The increase of mass flux weakens the influence of natural convection and improves local heat transfer at the top side. At the low mass flux condition, the increase of pressure conducts the same effect with the increase of mass flux. At the high mass flux condition, the increase of pressure reduces the local heat transfer at the top side.

通过实验和数值方法研究了在倾斜角为 25° 的光滑管中向超临界水的传热。实验结果表明，质量通量的增加改善了传热。随着压力的增加，物理性质变化对传热的影响变得平缓。因此，压力的增加减少了在增强条件下的传热。无量纲浮力参数Gr _q */ Gr _qth和${\overline{Gr}/\mathrm{电阻}\mathrm{电子}}^{2.7}$根据实验结果进行比较。评价结果表明，Gr _q */ Gr _qth适用于斜管流。基于超临界数据，提出了一种新的传热关联式。数值分析完成了剪切应力传递k - ω模型。相应的结果表明，变质量通量和压力对超临界传热的影响是通过改变湍流的径向分布特性和物理性质来实现的。质量通量的增加提高了边界流体的径向湍流和吸热能力，从而增强了超临界传热。在发生传热减少的低质量通量条件下，压力的增加改善了传热。在发生传热增强的高质量通量条件下，压力的增加减少了传热。浮力引起的自然对流的影响，导致斜管顶底侧传热不均。质量通量的增加减弱了自然对流的影响并改善了顶部的局部传热。在低质量通量条件下，压力的增加与质量通量的增加具有相同的作用。在高质量通量条件下，压力的增加减少了顶部的局部传热。