摘要
利用Fluent软件,在矩形翅片椭圆管尺寸给定的情况下,对椭圆管几何中心发生偏置的管外空气侧层流流动与换热进行数值研究,分析偏置距离与椭圆管短轴半径之比Δx/b和空气流速u对翅片管空气侧换热和流动的影响。结果表明,在计算的u范围内,随着u的增加,努赛尔数Nu逐渐增加,Δx/b=0. 5的翅片管努赛尔数Nu比Δx/b=-0. 5的翅片管增大约4. 83%~8. 7%;阻力系数f的变化不是特别显著,Δx/b=0. 5的翅片管阻力系数f比Δx/b=-0. 5的翅片管增加约4. 0%。就翅片效率而言,Δx/b=-0. 5时翅片的效率最高;就散热量而言,Δx/b=0. 5的翅片管比Δx/b=-0. 5的翅片管散热量增大2. 36%~4. 43%。
With the help of Fluent software,the laminar flow and heat transfer in the air side of a rectangular finned elliptical tube with offset geometric center were numerically studied. The effects of the ratio of offset distance to the radius of the elliptical tube short axis(Δx/b) and air velocity( u) on the heat transfer and flow in the air side of the finned tube were analyzed. The results show that the Nusselt number( Nu) increased gradually with the increase of u,and the convective heat transfer characteristic number( Nu) of the finned tube with Δx/b = 0. 5 was increased by about 4. 83%~ 8. 7% compared with that of the finned tube with Δx/b =-0. 5. The variation of the drag coefficient( f) was not particularly significant,and the drag coefficient( f) of the finned tube with Δx/b = 0. 5 was increased by about 4. 0% compared with that of the finned tube with Δx/b =-0. 5. In terms of fin efficiency,the fin efficiency was the highest when Δx/b =-0. 5. In terms of heat dissipation,the fin tube with Δx/b = 0. 5 had an increase of 2. 36%~ 4. 43% in heat dissipation compared with the fin tube with Δx/b =-0. 5.
作者
万长园
陈富强
马理强
Wan Changyuan;Chen Fuqiang;Ma Liqiang(North University of China Shuozhou,Shuozhou 036000,China)
出处
《压力容器》
北大核心
2019年第8期38-43,共6页
Pressure Vessel Technology
基金
山西省重点研发计划工业项目(201703D121009)
关键词
椭圆翅片管
翅片效率
偏置
数值模拟
散热量
elliptical finned tube
fin efficiency
offset
numerical simulation
heat dissipation
