矩形偏心翅片椭圆管流动与换热的数值研究

摘要

采用Fluent软件，在进口空气流速v＝0．5~4．0 m/s下，对不同波纹倾角(θ＝0°、θ＝5°、θ＝10°、θ＝15°、θ＝18°)的矩形偏心波纹翅片椭圆管换热器翅片间的流动与换热规律进行了三维数值模拟，分析了不同雷诺数Re和波纹倾角θ对矩形偏心波纹翅片椭圆管换热器的翅片表面平均努塞尔数Nu、压差损失Δp以及翅片管综合换热性能因子j/f的影响.研究结果表明：矩形偏心平直翅片椭圆管的综合换热性能最佳；适当增加翅片前端迎风侧波纹倾角，减小翅片后部区域波纹倾角，可同时起到增强换热、减少阻力损失的双重作用.%Three dimensional numerical simulation on heat and mass transfer of rectangular eccentric corru-gated fin-and-oval tube heat exchangers with different corrugated inclination angles (θ=0°,θ=5°,θ=10°,θ=15°,θ=18°)and inlet air velocities (from 0.5 m/s to 4.0 m/s)was performed by the FLUENT soft-ware.The effects Reynolds number (Re)and corrugated inclination angle (θ)on average Nusselt number (Nu)of the rectangular eccentric corrugated fin-and-oval tube heat exchanger surface,differential pressure lossΔP and finned tube heat transfer performance influence factor j/f were analyzed.The results show that:the comprehensive heat transfer performance of the rectangular eccentric plate-fin-and-oval tube heat exchanger is the best;properly increasing the front windward corrugated inclination angle and reducing the rear area corrugated inclination angle of the corrugated fin can enhance the heat transfer and reduce the re-sistance loss at the same time.