波纹翅片开设涡发生器强化传热数值模拟

Numerical Modelling on Heat Transfer Enhancement Performance of Wavy Fin-and-Tube Heat Exchanger Punched With Vortex Generator

在波纹翅片上开设矩形翼和组合翼纵向涡发生器,采用数值模拟的方法分析其强化换热特性,分析辅翼的几何尺寸,包括辅翼攻角、长度和宽度等对换热增强比Nu/Nu_0以及综合强化换热因子(Nu/Nu_0)/(f/f_0)^(1/3)的影响。结果发现:矩形翼和组合翼能显著增强波纹翅片的对流换热;由于开设纵向涡发生器后使流动阻力增加,综合强化换热因子小于换热增强比;组合翼的换热增强比和综合强化换热因子均大于矩形翼;对于组合翼,随着辅翼攻角、辅翼长度或辅翼宽度的增加,换热增强比和综合强化换热因子均增加。

The performance of heat transfer enhancement of wavy fin punched with rectangular winglet pairs （RWPs） or combined rectangular winglet pairs （CRWPs） were numerically analyzed. The influences of accessory wing attack angle, accessory wing length and accessory width of CRWP on the ratio of heat transfer enhancement, Nu/Nuo, and performance evaluation factor, （Nu/Nuo）/（f/fo）1/3, were examined. The modelling results showed that RWP and CRWP can effectively enhance the heat transfer of the wavy fin. The ratio of heat transfer enhancement is larger than the performance evaluation factor due to the increased flow resistance. The ratio of heat transfer enhancement and the performance evaluation factor of CRWP are larger than that of RWP. For CRWP, Nu/Nuo and （Nu/Nuo）/（f/fo）1/3 increase with the increases of the accessory wing attack angle, the accessory wing length or the accessory width.