翅片参数对开缝翅片管换热器换热与阻力性能的影响  

Effects of Fin Parameters on Heat Transfer and Resistance Characteristics of Slit Finned Tube Heat Exchangers

作　　者：李猛 袁益超[1] LI Meng;YUAN Yi-chao(Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering,University of Shanghai for Science and Technology,Shanghai,China,200093)

机构地区：[1]上海理工大学上海市动力工程多相流动与传热重点实验室,上海200093

出　　处：《热能动力工程》2020年第4期153-162,共10页Journal of Engineering for Thermal Energy and Power

摘　　要：在模化试验验证的基础上,通过数值模拟,获得了翅片间距Pf及开缝数量n_s对开缝翅片管换热器性能的影响规律:ns≤6时,翅片侧Nu和流动阻力均随着P_f增大而减小;ns>6时,翅片侧Nu随Pf增大先减小后增大,而阻力逐渐降低;Pf=3.51~3.97 mm时,随n_s增大,阻力逐渐增大,ns=4~6时,翅片侧Nu逐渐增大,ns=6~8时,翅片侧Nu变化较小;Pf=3.97~4.43 mm时,ns由4片增加至8片,翅片侧Nu和阻力均逐渐增大。根据不同结构的开缝翅片管换热器的综合流动换热性能,提出了Pf与ns的最佳组合。Based on the modeling test,numerical simulations have been carried out on effects of fin pitches Pf and number of slits ns on characteristics of slit finned tube heat exchangers.The results showed that for slit finned tube heat exchangers with ns less than or equal to 6 pieces,both Nu and flow resistance at fin-side decreased with the increase of Pf.When ns were greater than 6 pieces,Nu at fin-side declined first and was enhanced later by raising Pf.Meanwhile,Eu at fin-side gradually dwindled.For slit finned tube heat exchangers with Pf between 3.51-3.97 mm,Nu at fin-side increased when ns was enlarged from 4 to 6 pieces.However,the heat transfer characteristics did not significantly change when ns was increased from 6 to 8 pieces.For finned tube heat exchangers with Pf between 3.97-4.43 mm,the heat transfer and resistance characteristics increased as ns grew from 4 to 8 pieces.According to the comprehensive flow heat transfer performance of slit finned tube heat exchangers with different structures,the optimum combination of P_f and ns was put forward.

关 键 词：开缝翅片管换热器 模化试验 数值模拟 换热性能 阻力性能 

分 类 号：TK172[动力工程及工程热物理—热能工程]