中文摘要：

在太空的地里，设备的最小和封口在严厉地的热装载引起增加。由于驱动力的缺乏，常规 condenser 的表演在小严肃环境下面极大地败坏，它在设备的服务生活导致减小。在这研究，被动 condenser，在阶段分离概念的基础上发展了，被利用在小严肃环境下面改进冷凝作用热转移的表演。由于实验的限制，阶段分离 condenser 试管的热转移改进的机制基于 volume-of-fluid (VOF ) 通过数字模拟被揭示方法。下列结论能被获得：(1 ) 在试管核心的试管墙和液体附近的气体的新奇阶段分布被形成。薄液体电影被插入网孔柱体确实在流动模式调整以后创造。(2 ) 为在环形的区域的单个水泡的冷凝作用数量增加大约 16 比那大倍在在 J _l =0.0574m/s 和 J _g =0.0229m/s。(3 ) 煤气的卷部分影响液体电影厚度，水泡长度和液体桥长度的参数。煤气的卷部分的增加从 21.56 ～ 12.82 在评估索引导致减少。评估索引每统一环形的区域和赤裸的试管区域的试管长度被定义为冷凝作用数量的比率。

英文摘要：

In the field of aerospace, minimum and seal of equipments cause the increase in the thermal loading sharply. Due to the lack of driving force, the performance of conventional condenser deteriorates greatly under the small gravity environment, which leads to reduction in the service life of equipments. In this study, a passive con- denser, developed on basis of the phase separation concept, is utilized to improve the performance of the condensation heat transfer under the small gravity environment. As a result of the limitation of experiments, the mechanisms of heat transfer enhancement of the phase separation con- denser tube are revealed through numerical simulation based on the volume-of-fluid （VOF） method. The follow- ing conclusions could be obtained： （1） A novel phase dis- tribution of ＂gas near the tube wall and liquid in the tube core＂ is formed. The thin liquid film is indeed created after the flow pattern modulation by inserting mesh cylinder. （2） The condensation quantity for single bubble in the annular region increases about 16 times greater than that in the bare tube region in the case of Jl = 0.0574 m/s and Jg =0.0229 m/s. （3） Gas volume fraction affects the parameters of liquid film thickness, bubble length and liquid bridge length. The increase in the gas volume frac- tion results in the decrease in the evaluation index from 21.56 to 12.82. The evaluation index is defined as the ratio of the condensation quantities per unit tube length of the annular region and the bare tube region.