摘要
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.
出处
《天津大学学报（自然科学与工程技术版）》
EI
CAS
CSCD
北大核心
2014年第10期928-933,共6页
Journal of Tianjin University：Science and Technology
基金
天津市科委重点资助项目(2009ZCKFGX01900)
天津农学院科学研究发展基金资助项目(2011N01)
关键词
内置管
多相流
强化传热
两相流闭式重力热管
三相流闭式重力热管
built-in pipe
multiphase flow
heat transfer enhancement
two-phase flow closed thermosyphon
three-phase flow closed thermosyphon
