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Flow and heat transfer performance of double U-shaped-tubes modeled heat exchanger
Received date: 2015-01-12
Revised date: 2015-02-26
Online published: 2015-03-11
In order to investigate the flow and heat transfer performances of double U-shaped-tubes modeled heat exchanger, model experiments were conducted in a low-speed high-temperature wind tunnel and numerical calculations were also conducted using Fluent-CFD software. The effects of tube cross-sectional shape and heat exchanger inclined angle on the pressure drop and recuperator effectiveness were obtained. The results show that the internal pressure drop for the elliptic-tube heat exchanger is increased by about 50%-60% relative to the circular-tube heat exchanger at the same averaged flow velocity inside the U-shaped tube. For the external flow, the pressure drop is significantly increased as the increase of heat exchanger inclined angle. At inclined angle of 30°, the pressure drop outside the elliptic-tube heat exchanger is significantly lower than that of the circular-tube heat exchanger with approximately 50% decrease. As the heat exchanger inclined angle increases, the recuperator effectiveness is significantly improved. By comparison with the effect of inclined angle, the tube shape has a weak influence on the recuperator effectiveness. The internal flow entering-gathering mode has moderate effect on the recuperator effectiveness of U-shaped-tubes heat exchanger.
LIU Xiyue , ZHANG Jingzhou , LI Gangtuan , KANG Yong . Flow and heat transfer performance of double U-shaped-tubes modeled heat exchanger[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2015 , 36(12) : 3832 -3842 . DOI: 10.7527/S1000-6893.2015.0053
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