Volume 30 Issue 11
Nov.  2015
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LIU Xi-yue, ZHANG Jing-zhou, LI Gang-tuan, KANG Yong. Model experiment on pressure drop and thermal efficiency of double U-shaped tubes heat exchanger[J]. Journal of Aerospace Power, 2015, 30(11): 2592-2599. doi: 10.13224/j.cnki.jasp.2015.11.005
Citation: LIU Xi-yue, ZHANG Jing-zhou, LI Gang-tuan, KANG Yong. Model experiment on pressure drop and thermal efficiency of double U-shaped tubes heat exchanger[J]. Journal of Aerospace Power, 2015, 30(11): 2592-2599. doi: 10.13224/j.cnki.jasp.2015.11.005

Model experiment on pressure drop and thermal efficiency of double U-shaped tubes heat exchanger

doi: 10.13224/j.cnki.jasp.2015.11.005
  • Received Date: 2014-09-11
  • Publish Date: 2015-11-28
  • Pressure drop and thermal efficiency of double U-shaped tube heat exchanger, especially the effects of tube cross-sectional shape and heat exchanger inclined angle, were experimentally investigated in a low-speed wind tunnel. The results show that the internal pressure drop for the elliptical tube heat exchanger is bigger than the circular tube heat exchanger under the same averaged flow velocity inside the U-shaped tube. The difference between two different heat exchangers is more obvious under higher flow velocity inside the U-shaped tube. For the external flow, the pressure drop is significantly increased with the increase of the heat exchanger's inclined angle. Under small inclined angle, the external flow pressure drop for the elliptical tube heat exchanger is somewhat higher than the circular tube heat exchanger. However, the pressure drop outside the elliptical tube heat exchanger is significantly lower than the circular tube heat exchanger under big inclined angle. The overall heat transfer coefficient of heat exchanger with 30 degree inclination is about 50% higher than that with 10 degree. Under the density flow ratio of 0.4, the thermal efficiency of elliptical tube heat exchanger is increased about 6% in relative to the circular tube heat exchanger.

     

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