Pool boiling heat transfer is widely applied in nuclear engineering fields. The influence of heating surface orientation on the pool boiling heat transfer has received extensive attention. In this study, the heating surface with different roughness was adopted to conduct pool boiling experiments at different inclination angles. Based on the boiling curves and bubble images, the effects of inclination angle on the pool boiling heat transfer and critical heat flux were analyzed. When the inclination angle was bigger than 90°, the bubble size increased with the increase of inclination angle. Both the bubble departure frequency and critical heat flux decreased as the inclination angle increased. The existing theoretical models about pool boiling heat transfer and critical heat flux were compared. From the perspective of bubble agitation model and Hot/Dry spot model, the experimental phenomena could be explained reasonably. The enlargement of bubble not only could enhance the agitation of nearby liquid but also would cause the bubble to stay longer on the heating surface. Consequently, the effect of inclination angle on the pool boiling heat transfer was not conspicuous. With the increase of inclination angle, the rewetting of heating surface became much more difficult. It has negative effect on the critical heat flux. This work provides experimental data basis for heat transfer and CHF performance of pool boiling.

池沸腾传热广泛应用于核工程领域。受热面取向对水池沸腾传热的影响受到广泛关注。本研究采用不同粗糙度的加热面进行不同倾角的水池沸腾实验。基于沸腾曲线和气泡图像，分析了倾角对池沸腾传热和临界热通量的影响。当倾角大于90°时，气泡尺寸随着倾角的增大而增大。气泡离开频率和临界热通量都随着倾角的增加而减小。比较了现有的池沸腾传热和临界热通量理论模型。从气泡搅拌模型和热点/干点模型的角度，可以合理解释实验现象。气泡的扩大不仅会增强附近液体的搅动，还会使气泡在受热面上停留的时间更长。因此，倾角对池沸腾传热的影响并不明显。随着倾角的增加，受热面的再润湿变得更加困难。它对临界热通量有负面影响。这项工作为池沸腾的传热和CHF性能提供了实验数据基础。因此，倾角对池沸腾传热的影响并不明显。随着倾角的增加，受热面的再润湿变得更加困难。它对临界热通量有负面影响。这项工作为池沸腾的传热和CHF性能提供了实验数据基础。因此，倾角对池沸腾传热的影响并不明显。随着倾角的增加，受热面的再润湿变得更加困难。它对临界热通量有负面影响。这项工作为池沸腾的传热和CHF性能提供了实验数据基础。