凹凸管传热与流阻性能的数值模拟  

Numerical Simulation of the Heat Transfer and Flowing Resistance Performances of Concavo-Convex Tube

作　　者：张亚君[1] 邢华伟[1] 邓先和[1] 

机构地区：[1]华南理工大学教育部传热强化与过程节能重点实验室,广东广州510640

出　　处：《华南理工大学学报（自然科学版）》2005年第2期29-33,共5页Journal of South China University of Technology(Natural Science Edition)

基　　金：国家重点基础研究发展规划项目(G2000026300)

摘　　要：利用Fluent数值模拟软件,对凹凸管进行了流动和传热的三维数值模拟,得到了 管内的流动速度分布及温度分布,并将模拟结果与光滑管的结果进行了对比.结果表明, 在相同的流动速度下,凹凸管的阻力系数及传热膜系数都大于光滑管,且阻力系数之比随 雷诺数的增大而增大,而传热膜系数之比随雷诺数的增大而减小.在本数值模拟范围内, 雷诺数由2757.76增大到13788.79时,阻力系数之比由5.5308增大到8.3663,传热膜 系数之比则由2.289减小到1.585.综合评价结果表明,凹凸管的综合性能在低速时能得 到明显改善,说明凹凸管特别适合低速流时的强化传热.A 3-D numerical simulation of the flow and heat transfer process in a concavo-convex tube was carried out by using the Fluent Software. Thus, the velocity and temperature distributions inside the tube were obtained. By the comparison between the simulated results of the concavo-convex tube with those of the smooth tube, it is indicated that the resistance coefficient and the heat transfer coefficient of the concavo-convex tube are much larger than those of the smooth tube, and that, comparing the concavo-convex tube with the smooth tube, the resistance coefficient ratio increases with an increasing Reynolds number, while the heat transfer coefficient ratio decreases. It is also shown that, in the simulation range, when Reynolds number ranges from 2757.76 to 13788.79, the resis-tance coefficient ratio and the heat transfer coefficient ratio respectively vary from 5.5308 to 8.3663 and from 2.289 to 1.585. The overall evaluation affirms that the integrate property of the concavo-convex tube obviously improves at a lower velocity, which means that the concavo-convex tube is adaptive to the heat transfer enhancement at lower velocity.

关 键 词：凹凸管 传热 流阻 综合性能 数值模拟 

分 类 号：TQ021.3[化学工程]