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本文报道了用Ｎ—甲基吡咯烷酮（Ｃ５Ｈ９ＮＯ３）为工质以光滑管与三维内翅片管为管壳制成的两相闭式逆流热虹吸管的传热特性。实验结果表明在工作温度为２２０～３５０℃，热负荷为８．２～１７．３ｋＷ／ｍ２范围内光滑热虹吸管蒸发段与凝结段换热系数的积分平均值分别约为１７００Ｗ／ｍ２·℃和１６００Ｗ／ｍ２·℃。由于三维翅片的强化传热作用，使三维内翅片热虹吸管蒸发段与凝结段换热系数分别比光滑管增大了２０％～４０％和７０％～１６０％。实验表明Ｎ—甲基吡咯烷酮综合传热性能优于萘，可望作为中温热管工质使用。
In this paper, the heat transfer characteristics of a two-phase closed countercurrent thermosyphon with N-methyl pyrrolidone (C5H9NO3) as working medium in the form of a smooth tube and a three-dimensional inner finned tube are reported. The experimental results show that the integral average values of the heat transfer coefficient between the evaporating section and the condensing section of the smooth thermosyphon at the working temperature of 220 ~ 350 ℃ and the heat load of 8.2 ~ 17.3kW / m2 are about 1700W / m2 · ℃ and 1600W / m2 · ℃. Due to the enhanced heat transfer of the three-dimensional fin, the heat transfer coefficients of the evaporating section and the condensing section of the three-dimensional inner fin thermosyphon are respectively increased by 20% -40% and 70% -160% compared with the smooth tubes. Experiments show that N-methyl pyrrolidone heat transfer performance superior to naphthalene, is expected to be used as a medium temperature heat pipe refrigerant.