管内内插双斜杆的强化传热数值模拟及结构优化研究  

Numerical Studies on Heat Transfer Performance and Structure Optimisation for Tube Inserted With Double Diagonal Rod

作　　者：周路遥[1] 贾晖[1] 刘伟[1] 

机构地区：[1]华中科技大学能源与动力工程学院,湖北武汉430074

出　　处：《工程热物理学报》2013年第5期957-960,共4页Journal of Engineering Thermophysics

基　　金：国家重点基础研究发展计划资助项目(No.2013CB228302);国家自然科学基金资助项目(No.51036003);教育部博士点基金资助项目(No.20100142110037)

摘　　要：本文采用数值计算的方法,以水为流动介质,对管内插双斜杆的强化传热管进行流动与传热特征分析。结果表明,插入双斜杆导致换热管内的流体在流体核心及边界区域内同时扰动,并且形成双层的纵向旋流,因此能够有效提升换热管的换热综合性能(相对于光管,努塞尔数Nu增加4 5到6 4倍,阻力f增大2到5倍)。In this paper, a three-dimensional analysis on heat transfer and fluid flow of a tube inserted with double diagonal rod is performed by numerical simulation. Results indicated that the perturbation occurs both at the boundary and the core area of the fluid when the flow through the tube. The diag- onal rod caused a double-deck longitudinal vortex formation which significantly improved the overall heat transfer performance of the tube. Compared with the smooth tube, an increase of 4.5 to 6.4 times for Nusselt number （Nu） as well as an augmentation of 2 to 5 times for flow resistance f were obtained.

关 键 词：双斜杆 数值模拟 强化传热 纵向旋流 

分 类 号：TK124[动力工程及工程热物理—工程热物理]