摘要
针对管内除垢与防垢及强化传热问题,对工程上应用较广的扭曲管、扭带管中旋流场内低浓度液固流场综合性能进行实验及模拟研究.结果表明,含粒子旋流场可提高流体湍流强度,与圆管相比,扭曲管和内插扭带圆管均有较好的旋流效果,相同Re下扭曲管的换热系数提高18.7%~30.1%,阻力系数提高13.1%~181.8%,综合性能评价因子平均提高15.5%,高于圆管和扭带管：而扭带管的换热系数比圆管提高5.6%~32.9%,阻力系数最高.对扭曲管内粒子传热性能进一步优化,模拟值与实验值的误差为10.7%~12%.旋流作用有利于提高液固流场的综合性能,但较高流速下该综合性能则逐渐降低.
Considering descaling, antiscaling and heat transfer problems in tubes, the widely used twisted and twisted tape inserted tubes were taken as object to study low concentration liquid-solid two-phase flow in rotational flow field on heat transfer. The results shows that the rotational flow field with particles can enhance the turbulence intensity of fluid, both twisted and twisted tape inserted tubes can achieve better rotational flow effect at the same Re, the heat exchange effect in twisted tube with particles is raised 18.7%~30.1% and the resistance coefficient 13.1%~ 181.8% compared with smooth circular tube, and its performance factor of combined evaluation is higher than the other heat transfer tubes over 15.5%. The heat exchange effect of twisted tape inserted tube with particles is raised 5.6%~32.9% over circular tube, and this tube has the highest resistance coefficient. Further experiment and optimization on the heat exchange effect of twisted tubes with particles show that the error range between the simulation and experimental results is 10.7%~12%. Rotational flow field can enhance the combined performance of liquid-solid two-phase flow, while increasing the flow rate will cause negative effect.
出处
《过程工程学报》
CAS
CSCD
北大核心
2013年第4期586-590,共5页
The Chinese Journal of Process Engineering
基金
湖南省自然科学基金资助项目(编号:11JJ9003)
湖南省教育厅青年基金资助项目(编号:06B024)
关键词
旋流场
液固两相流
数值模拟
综合性能
rotational flow field
liquid-solid two-phase flow
numerical simulation
combination property
