摘要
为了研究螺旋扭曲扁管管外强化换热性能,采用周期性边界条件对螺旋扭曲扁管管外层流流动与换热性能进行了数值模拟和理论分析,并且与圆管进行比较。通过建立不同规格的螺旋扭曲扁管换热器几何模型,得出螺旋扭曲扁管的长短轴比a/b越大、螺距s越小,其管外传热性能就越好,强化传热综合性能评价因子就越大,与此同时,其流动阻力也会增大。随着Re数的增大,强化传热综合性能增强,但趋势变缓。该研究结果对螺旋扭曲扁管换热器的设计有一定的参考价值。
In order to research the heat transfer performance outside the twisted oval tube, the theoretical analysis and numerical simulation were performed for the periodically fully developed fluid flow and heat transfer of the laminar flow outside the twisted oval tube with periodic boundary condition. Different specifications geometric models of twisted oval tubes including the aspect ratio a/b and the pitch s were established to analyze the performance outside the tube. The results show that the heat transfer performance of twisted oval tube increase with the increasing of a/b and decreasing of s, and the flow resistance will also increase. The heat transfer performance of twisted oval tube increases with the increasing of the reynolds number, and the trend slows down. The results have a certain reference value for the design of twisted oval tube exchanger.
出处
《轻工机械》
CAS
2016年第6期15-20,共6页
Light Industry Machinery
关键词
螺旋扭曲扁管
层流
周期性边界条件
评价因子
强化传热
twisted oval tube
laminar flow
periodic boundary condition
evaluation criterion
heat transfer enhancement
