研究了R-113蒸汽管侧冷凝的被动式强化传热技术。为此，对传热实验室的基本实验设施进行了广泛改造。对光滑管、带有两种不同螺距的扭带插入件的光滑管、三个内翅片管、两个具有重复肋粗糙度的管和一个螺旋槽管进行了测试。在标称面积的基础上，扭带插入物的总平均传热系数比光滑管的总平均传热系数提高了约30%。翅片数最多且最短的翅片管性能最好，传热系数（基于标称面积）提高了120%。与光滑管相比，重复肋管的总平均传热系数提高了约80%。螺旋槽管的传热系数提高了约50%。带扭带的光滑管中的压降比光滑管中的压降高250%，而其他增强管中的压降增加不大。 当冷凝水流为湍流时，热流密度效应对性能影响不大。只有当温差很小时，过热效应才很重要。几种可用的光滑管关联式与光滑管传热和压降结果有很好的关联。通过修改光滑管关联式，建立了三种强化技术的传热和压降关联式。这些相关性为目前的实验结果提供了合理的描述。翅片管相关性与之前报道的相关性不一致；给出了这种行为的定性原因。利用传热和压降的实验结果评估了这些强化管的相对性能。评估表明，在相同的热负荷下，性能最佳的翅片管或重复肋管将允许在不增加压力损失的情况下大幅减小冷凝器尺寸。 鉴于形成肋条所需的额外材料较少，重复的肋条管值得进一步研究。

Passive heat transfer augmentation techniques were investigated with tube-side condensation of R-113 vapor. The basic experimental facility in the Heat Transfer Laboratory was extensively modified for this purpose. A smooth tube, the smooth tube with twisted-tape inserts of two different pitches, three internally finned tubes, two tubes with repeated-rib roughness, and a spirally fluted tube were tested.The twisted-tape inserts increased overall average heat transfer coefficients approximately 30 percent above those of the smooth tube on a nominal area basis. The finned tube with the shortest and largest number of fins had the best performance, with heat transfer coefficients (nominal area basis) increased up to 120 percent. The repeated-rib tubes increased overall average heat transfer coefficients about 80 percent over the smooth tube values. Improvements in heat transfer coefficient for the spirally fluted tube were approximately 50 percent. The pressure drop in the smooth tube with the twisted tapes was 250 percent higher than that in the smooth tube, while the pressure drop increases in the other augmented tubes were modest.The heat flux effect had an insignificant effect on the performance when the condensate flow was turbulent. The superheat effect was important only when the temperature difference was small.Several of the available smooth tube correlations correlated reasonably well the smooth tube heat transfer and pressure drop results. Heat transfer and pressure drop correlations were developed for the three augmentation techniques by modifying the smooth tube correlations. These correlations provided reasonable descriptions of the present experimental results. The finned-tube correlation did not agree with the correlations reported previously; qualitative reasons for this behavior are given.The relative performance of these augmented tubes was assessed using the experimental results for both heat transfer and pressure drop. The evaluation suggested that, at the same heat duty, the best performing finned tube or the repeated-rib tubes would permit a substantial reduction in condenser size without increasing pressure loss.The repeated-rib tubes merit further study in view of the small amount of extra material required to form the ribs.