波纹翅片板翅式换热器换热与阻力性能

Heat transfer and resistance performance of wavy-plate-fin heat exchanger

为研究翅片结构对波纹翅片板翅式换热器换热与阻力性能的影响规律,在模化实验验证的基础上,对21种波纹翅片的性能进行数值模拟。结果表明:翅高h≤10 mm时,其对换热与阻力性能影响较小;翅高h>10 mm时,随h增大,换热性能先提高(Re=1500、5000时分别提高3.54%、5.98%)后降低(Re=1500、5000时分别降低4.2%、5.95%),阻力性能先降低(Re=1500、5000时分别降低2.83%、5.65%)后提高(Re=1500、5000时分别提高2.99%、3.98%)。随翅片间距s增大,换热性能在低雷诺数时降低(Re=1500时降低16.02%),在高雷诺数时提高(Re=5000时提高6.83%),阻力性能降低(Re=1500、5000时分别降低151.6%、73.87%)。随翅片振幅2 A增大,换热性能提高(Re=1500、5000时分别提高49.29%、34.43%),阻力性能降低(Re=1500、5000时分别降低201.18%、146.2%)。随波长L增大,换热性能降低(Re=1500、5000时分别降低45.92%、51.73%),阻力性能提高(Re=1500、5000时分别提高78.51%、85.3%)。获得了传热因子j、摩擦因子f与翅片结构参数及雷诺数Re的关联式。

In order to study the effects of fin height(h),fin spacing(s),wavy fin amplitude(2 A)and wave length(L)on heat transfer and resistance performance of wavy fins in plate-fin heat exchangers,numerical simulation on 21 types of wavy fins was carried out and validation was done through model test.The results show that when h≤10 mm,the changes of heat transfer performance and resistance performance are little with h;when h>10 mm increase of h leads to the first increase(by 3.54%at Re=1500,5.98%at Re=5000)and then decrease(by 4.2%and 5.95%at Re=1500,5000)of heat transfer performance,and the first decrease(by 2.83%and 5.65%at Re=1500,5000)and then increase(by 2.99%and 3.98%at Re=1500,5000)of resistance performance.As s increases,heat transfer performance decreases(by 16.02%at Re=1500)at low Reynolds Numbers,and increases(by 6.83%at Re=5000)at high Reynolds Numbers,while resistance performance decreases(by 151.6%and 73.87%at Re=1500,5000).As 2 A increases,heat transfer performance increases(by 49.29%and 34.43%at Re=1500,5000)and resistance performance decreases(by 201.18%and 146.2%at Re=1500,5000).As L increases,heat transfer performance decreases(by 45.92%and 51.73%at Re=1500,5000)and resistance performance increases(by 78.51%and 85.3%at Re=1500,5000).The correlation of colburn factor(j)and fanning friction factor(f)with structural parameters and Reynolds numbers is proposed.