JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE) ›› 2014, Vol. 44 ›› Issue (6): 90-94.doi: 10.6040/j.issn.1672-3961.0.2014.125

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Numerical study on the air motion of H-type finned tubes and heat transfer characteristics

WU Yanyan, SUN Fengzhong, LI Fei, CHEN Changxian   

  1. School of Energy and Power Engineering, Shandong University, Jinan 250061, Shandong, China
  • Received:2014-05-04 Revised:2014-09-30 Published:2014-05-04

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Abstract: In order to analyze H-type finned tubes in different arrangement modes numerically, flow and heat transfer numerical models of H-type finned tubes in different arrangement forms were established. The change rules of flow and heat transfer characteristics of two typical arrangements has been obtained. The result showed that the special groove structure of H-type finned tubes turned leeward side into vertical flushing flow field with obvious three-dimensional flow characteristics which had the functions of automatic cleaning and nearly gathering no dust. The heat transfer coefficient of staggered finned parent tubes was higher than that of the parent tubes arranged in equal interval. Additionally, the difference of heat transfer effect was increasingly obvious with the increase of speed. The influence of array pitch of tubes on the heat transfer coefficient of finned tubes was remarkably greater than that of row pitch. The increase of the array pitch of tubes lowered the average speed of air in flow channel, heat transfer coefficient and the loss of flow channel.

Key words: heat-transfer characteristic, array pitch, resistance characteristic, row pitch, H-type finned tube

CLC Number: 

  • TK222
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