摘要
采用Fluent数值模拟了带凹坑的蛇形翅片扁管换热器空气侧的流动与换热。研究表明:与平直翅片相比较,凹坑对空气的流动产生了很大的扰动,采用凹坑翅片可以显著增强换热效果;在雷诺数Re=520~1 400的范围内,凹坑翅片与平直翅片相比其平均努塞尔数Nu_m增加了18%~24%,同时凹坑翅片比平直翅片的阻力系数f增加17%~28%;在雷诺数Re相同的条件下,随着凹坑半径R(0.8~1.8 mm)的逐渐增大,努塞尔数Nu_m和阻力系数f也逐渐增加;在同功耗条件下,与平直翅片相比较,采用带凹坑的翅片可以获得更佳的传热效果。
The air flow and heat transfer characteristics of the channels which formed by flat tube and the dimpled fin were studied numerically by Fluent. The results show that the heat transfer with dimpled fin is significally enhanced compared with plane fin because of the disturbing of dimple. For Reynolds number between 520 and 1304,the nusselt numbers of dimpled fin are enhanced18%~24%,while the friction factors are increased 17%~28%. The Nusselt numbers and the friction factors of the dimpled fin case are larger than that of the plain fin case at the same Re.The Nusselt number and he friction factor of the dimpled fin was increased with the increase of the dimple radius(0.8~1.8 mm) at the same Re.The dimpled fin is acquired more heat transfer efficiency with the same power consumption.
出处
《节能》
2020年第6期91-94,共4页
Energy Conservation
基金
2019年度广西高校中青年教师科研基础能力提升项目(项目编号:2019KY1566)。
关键词
翅片管换热器
凹坑翅片
数值模拟
换热特性
fin tube heat exchange
dimple radius
numerical simulation
heat transfer characteristics
