Numerical studies on heat transfer and flow characteristics for laminar flow in a tube with multiple regularly spaced twisted tapes
Numerical studies on heat transfer and flow characteristics for laminar flow in a tube with multiple regularly spaced twisted tapes
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多条规则间隔扭带管内层流传热和流动特性的数值研究
DOI：
10.1016/j.ijthermalsci.2012.02.025
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发表时间：
2012-08
影响因子：
4.5
通讯作者：
Liu W
中科院分区：
文献类型：
--
作者：
Zhang X Y;Liu Z C;Liu W
提出了管芯流强化换热原理，以提高温度均匀性，降低流动阻力，不同于管边界流强化换热。本文模拟了三捻带和四捻带在管内引起的多纵向涡旋。为了了解雷诺数为300 ~ 1800的三捻带和四捻带管内热流和流体流动的物理行为，进行了数值模拟。结果表明，三捻带和四捻带的努塞尔数分别提高了171%和182%。三捻带和四捻带管的摩擦系数约为普通管的4.06-7.02倍。管的PEC从1.64到2.46不等。结果验证了芯流强化换热理论。通过物理量协同分析，探讨了强化传热的机理。计算了协同角β和θ，数值结果验证了对流换热流场中流体颗粒物理量之间的协同规律，可以指导优化设计。
The principle of heat transfer enhancement in the core flow of tube has been proposed to improve the temperature uniformity and reduce flow resistance, which is different from that of heat transfer enhancement in the boundary flow of tube. This article presents a simulation of multi-longitudinal vortices in a tube induced by triple and quadruple twisted tapes insertion. The simulation is conducted in order to gain an understanding of physical behavior of the thermal and fluid flow in the tube fitted with triple and quadruple twisted tapes for the Reynolds number from 300 to 1800. The obtained results show that, a maximum increase of 171% and 182% are observed in the Nusselt number by using triple and quadruple twisted tapes. And the friction factors of the tube fitted with triple and quadruple twisted tapes are around 4.06–7.02 times as that of the plain tube. The PEC of the tubes varies from 1.64 to 2.46. And the results verify the theory of the core flow heat transfer enhancement. Physical quantity synergy analysis is performed to investigate the mechanism of heat transfer enhancement. The synergy angles β and θ, are calculated, and the numerical results verify the synergy regulation among physical quantities of fluid particle in the flow field of convective heat transfer, which can guide us to get the optimum design.
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DOI：
10.1016/s0017-9310(02)00355-1
发表时间：
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影响因子：
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