缩放平行板间插入旋流片的复合强化传热  

Compound Heat Transfer Enhancement by Parallel Converged-Diverged Plate Inserted with Twisted Tapes

作　　者：何兆红[1] 邓先和[1] 管志樟[1] 李志武[1] 

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

出　　处：《华南理工大学学报（自然科学版）》2009年第12期53-57,共5页Journal of South China University of Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(20776046)

摘　　要：为了研究新型换热器——矩形管束换热器的传热性能,通过在缩放平行板间插入一组旋流片来研究旋流片下游的传热与流阻,并与光滑平行板、无旋流片缩放平行板的传热效果进行比较.实验结果表明:在实验范围内(19000<Re<44000),缩放平行板间插入旋流片时,随着旋流片下游距离的增大,其局部努赛尔数和阻力系数减小,而强化传热综合因子先增大后减小;当Re为19071、旋流片下游距离为140mm时,强化传热综合因子达到最大值,比光滑平行板和无旋流片缩放平行板的传热性能分别提高15%和9%左右,说明缩放平行板复合旋流片有较好的强化传热效果。In order to analyze the heat transfer performance of a new type of heat exchanger, namely, the rectangular tube-bundle heat exchanger, the characteristics of heat transfer and flow resistance of two parallel converged-diverged plates inserted with twisted tapes were experimentally investigated, and the results were then compared with those of smooth plates as well as with those of the parallel converged-diverged plates without twisted tapes. It is found that, when the Reynolds number varies from 19000 to 44000, both the local Nusselt number and the friction factor decrease with the increase of the distance from the tape tail, while the efficiency index of heat transfer enhancement first increases and then decreases; and that, when the Reynolds number is 19071 and the distance from the tape tail is 140mm, the efficiency index reaches the maximum, which is 15% and 9% higher respectively than that of the smooth plates and that of the parallel converged-diverged plates without twisted tapes. It is thus concluded that the parallel converged-diverged plates inserted with twisted tapes greatly enhance the heat transfer.

关 键 词：复合强化传热 矩形管束换热器 缩放平行板 旋流片 

分 类 号：TK124[动力工程及工程热物理—工程热物理]