通过在闭式重力热管中加内置管，考察内置管对两相流及三相流体系传热性能的影响．结果表明：加入内置管后，等效对流传热系数、冷凝段对流传热系数较未加入内管时有所提高，而内置管对加热段的对流传热影响不明显；在具有内置管的体系中，当加入沙子的固含率达到2%以上时，等效对流传热系数较两相流体系有明显提高，最大增加了30.7%；随着加热功率的增大，两相流及三相流体系的等效对流传热系数增加．%To study the heat transfer performance of the two-phase closed thermosyphon and the three-phase closed thermosyphon,a special experimental system was designed by employing a vertical gravity thermosyphon with a built-in pipe. For the multiphase flow closed thermosyphon,the experimental results show that the equivalent convec-tive heat transfer coefficients and the heat transfer coefficients of condensation section increase when a built-in pipe is used,while the effect of the built-in pipe on heat transfer of the heating section convection can be neglected. When the solid holdup of sand is above 2%,the equivalent convective heat transfer coefficient is obviously higher than that of the two-phase flow system,and the maximum increase can reach 30.7%. The equivalent convective heat transfer coefficients increase with the rising of heating power for both two-phase and three-phase flow closed thermosyphons.
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