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中文摘要：
针对蛇形管内的汽液两相流进行了可视化观测，发现弯头处相变主要发生在弯头内侧。通过对局部弯头液相的流动与换热进行数值模拟可以发现，弯头内速度场的重新分布是形成内外两侧换热非均匀性的主因，并且利用内外两侧壁面的核化条件以及温度分布对实验现象进行了分析和认识。
英文摘要：
A series of visual experiments were conducted for liquid-vapor two-phase flow in hairpin tubes, and it was observed that most of the nucleation sites located at the outer tube wall of the bend. From the simulation, it was concluded that the uneven velocity distribution in the bend induced the heat transfer heterogeneity. Furthermore, the nucleation of both inner and outer tube wall of the bend and the wall temperature distribution were discussed to understand the physical phenomena.
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