摘要
以螺旋翅片强化定形机热管换热器为研究对象,使用Fluent软件对空气侧流动与传热过程进行数值计算,对比分析了螺旋翅片管、平直翅片管和光管的传热性能,得到了螺旋翅片厚度、间距、横向管间距对热管管束性能的影响结果。计算分析入口风速为2~8 m/s、翅片间距为3~6 mm、翅片厚度为0.8~1.2 mm、横向管间距为50~90 mm的不同参数组合模型的努塞尔数Nu、欧拉数Eu、综合评价因子j/f。结果表明:新风入口速度增大,Nu与j/f减小,Eu增大,换热器换热性能下降,所受阻力增大,因此入口风速不宜过大;螺旋翅片的强化换热效果最好,综合评价因子j/f比平直翅片、光管提高了9.27%、202.30%;在一定范围内,减小翅片厚度和横向管间距能够提升换热器的换热性能,翅片间距为5 mm时热管管束综合性能最好。
The heat pipe heat exchanger of the spiral fin strengthening setting machine was chosen as the research object,and the flow and heat transfer process on the air side were numerically calculated by using Fluent software.The heat transfer performance of spiral fin tube,flat fin tube and smooth tube was compared and analyzed to obtain the influence factors of properties of heat pipe bundle such as the thickness,spacing,and transverse tube spacing of spiral fins.The Nusselt number Nu,Euler number Eu and comprehensive evaluation factor j/f of different parameter combination models with an inlet wind speed of 2~8 m/s,fin spacing of 3~6 mm,fin thickness of 0.8~1.2 mm and transverse spacing of 50~90 mm were calculated and analyzed.The results show that with the increase of inlet velocity of fresh air,Nu and j/f decrease,Eu increases,heat transfer performance of the heat exchanger decreases,and the resistance increases.Therefore,inlet wind speed should not be too high.The enhanced heat transfer effect of spiral fin is the best,and the comprehensive evaluation factor j/f is increased by 9.27% and 202.30% compared with that of flat fin and smooth tube.In a certain range,the property of the heat exchanger can be improved by reducing the fin thickness and transverse tube spacing.The comprehensive performance of heat pipe bundles is the best when the fin spacing is 5 mm.
作者
宋磊
刁永发
戴家傲
SONG Lei;DIAO Yongfa;DAI Jiaao(College of Environmental Science and Engineering,Donghua Univeristy,Shanghai 201620,China)
出处
《染整技术》
CAS
2023年第2期36-43,共8页
Textile Dyeing and Finishing Journal
关键词
热管换热器
螺旋翅片
空气侧
传热特性
阻力特性
heat pipe heat exchanger
spiral fin
air side
heat transfer performance
resistance characteristics
