In order to study the performance of heat exchangers in tube side swirl enhancement,a swirl element suitable for gas flow was designed and installed at the inlet of the tube side heat exchange tube of the heat exchanger.Through RNG k-ε A numerical study was conducted on the model to investigate the conditions of different swirl structures and inlet flow rates of 30～50 m3/h for heat exchangers,and the simulation results were used for the design of heat exchangers and the construction of experimental systems.The results showed that the addition of swirl elements could make the flow tend to be uniform and enter each heat exchange tube.The swirl element significantly improved the velocity near the wall of the heat exchange tube,and the overall heat transfer coefficient increased by 76.1%～135.9%,with a pressure drop increase of about 5.7%～19.5%.The addition of swirl elements enabled the heat exchanger to achieve a higher heat transfer coefficient with minimal pressure loss.The spiral angles(14 °,18 °,26 °),lengths(32 mm,48 mm,64 mm),and blade widths(8 mm,10 mm,12 mm)were analyzed.The optimal performance of the heat exchanger was achieved,When α= 18 °,L=48 mm,and W=10 mm.
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