内置扭带管内湍流流动与传热数值模拟  

Numerical Simulation of Turbulent Fluid Flow and Heat Transfer in a Circular Tube with Twisted Tape Inserts

作　　者：吴金星[1] 王超[1] 王明强[1] 刘艳会[1] 李亚飞[1] 

机构地区：[1]郑州大学化工与能源学院,河南郑州450001

出　　处：《郑州大学学报（工学版）》2017年第3期10-14,共5页Journal of Zhengzhou University（Engineering Science）

基　　金：河南省重点科技攻关计划项目(132102210406);郑州市科技攻关计划项目(141PPTGG410)

摘　　要：为了提高内置扭带管的综合性能,开发了一种三边扭带,并对空管、普通扭带管、格栅扭带管及三边扭带管内流体流动与传热特性进行了数值模拟.以水为工质,采用RNG k-ε湍流模型,扭带扭率y=2.0,取Re=5 000~30 000,计算了扭带管内努赛尔数Nu、阻力系数f和综合性能评价因子η,与同工况下空管进行了对比.结果表明,相比于空管、普通扭带管和格栅扭带管,三边扭带管的综合性能较好,其η值比空管高出11.9%~33.2%.In order to improve the comprehensive performance of convection in tubes inserted with twisted tapes, in the developed 3-edge twisted tape, a simulation was carried out to examine the comprehensive char- acteristics of single phase convection in circular tubes inserted with twisted tapes, including typical twisted tape, grid spiral twisted tape and 3-edge twisted tape. With water as the working fluid, the behavior of fluid flow and heat transfer of these different types of twisted tapes with the same twist ratio y = 2.0 were studied. The RNG κ-ε turbulence model was chosen for the Reynolds number ranging from 5 000 to 30 000. The nus- selt number（Nu） , friction factor（f） and comprehensive performance evaluation factor（η） were calculated and compared with those of a plain tube in the same condition. The results showed that the comprehensive perform- ance of 3-edge twisted tape was better than plain tube, the tubes with typical twisted tape and grid spiral twis- ted tapes insert.

关 键 词：普通扭带 格栅扭带 三边扭带 强化换热 数值模拟 

分 类 号：TK172[动力工程及工程热物理—热能工程]