CAJ | 학술논문

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．
통과재폐식중력열관중가내치관，고찰내치관대량상류급삼상류체계전열성능적영향．결과표명：가입내치관후，등효대류전열계수、냉응단대류전열계수교미가입내관시유소제고，이내치관대가열단적대류전열영향불명현；재구유내치관적체계중，당가입사자적고함솔체도2%이상시，등효대류전열계수교량상류체계유명현제고，최대증가료30.7%；수착가열공솔적증대，량상류급삼상류체계적등효대류전열계수증가．
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.