ABSTRACT Governing the rate of heat transport by condenser tubes in the passive containment cooling system (PCCS), the steam condensation over a vertical cylinder in the presence of air was investigated experimentally. The main objective of this study was to explore if the condensation heat transfer coefficient relies on the tube dimension, which has been a variable missed in most condensation models or has been embraced without experimental demonstration under phase change environments. The mean heat transfer coefficient was measured in the condensation test facility named JERICHO (JNU Experimental Rig for Investigation of Condensation Heat transfer On tube). The outer diameter of the condenser tube used in this study was set to 21.5 mm. The measured heat transfer coefficients were compared to those obtained from the 40-mm-O.D. tube, and a multiplier to correct the variation of the heat transfer coefficient with the tube diameter was proposed for its application to Lee correlation. The proposed correlation was further validated against another set of experimental data obtained from a separate test facility housing the 31.8-mm-O.D. tube.

中文翻译：

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在有空气的情况下测量垂直 21.5 毫米外径管上蒸汽冷凝的传热系数

摘要 为了控制被动安全壳冷却系统 (PCCS) 中冷凝器管的热传输速率，实验研究了在空气存在的情况下在垂直圆柱体上的蒸汽冷凝。本研究的主要目的是探索冷凝传热系数是否依赖于管尺寸，这在大多数冷凝模型中是一个变量，或者在相变环境下未经实验证明就被采用。平均传热系数是在名为 JERICHO（JNU 管上冷凝传热研究实验装置）的冷凝测试设备中测量的。本研究中使用的冷凝器管的外径设置为 21.5 毫米。将测得的传热系数与从 40 毫米外径管获得的传热系数进行比较，并提出了一种用于校正传热系数随管径变化的乘数，以将其应用于 Lee 相关性。建议的相关性根据另一组从容纳 31.8 毫米外径管的单独测试设施获得的实验数据得到进一步验证。