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Flow and Heat-transfer Characteristics of Finned Tube Heat Exchanger with Arc Delta Winglets

SU Shi-chuan,LI Guang-chen,CHEN Ming-hua,ZHANG Xu,WANG Hao-dong(School of Energy and Power Engineering,Jiangsu University of Science and Technology,Zhenjiang 212003,China)  
3D numerical simulations were performed to investigate the flow and heat transfer coupling characteristics of finned tube heat exchangers with arc or straight delta-winglet vortex generators.Results show that when the Re is in 500-5 000,both the arc and straight delta winglets can enhance the heat transfer of heat exchanger.The enhancement effect of arc delta winglet is slightly weaker than the straight one,but its flow resistance is obviously smaller.In comparison with straight delta-winglet exchanger,the comprehensive performance of arc delta-winglet exchanger is 7.3%-11.5% and 8.2%-9.5% higher respectively in the case of aligned and staggered arrangement of heat-exchanger tube.The vortex generator can enable fluid to generate a velocity component perpendicular to the fin direction and improve the cooperativity between velocity filed and temperature field,and therefore the heat-transfer performance is enhanced.
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