JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE) ›› 2010, Vol. 40 ›› Issue (2): 143-148.

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3D numerical simulation of fluid flow and heat transfer in a circular tube with edge-fold-twisted-tape inserts


CUI Yong-zhang1,2, TIAN Mao-cheng1, LI Guang-peng2   

  1. 1. School of Energy ＆ Power Engineering, Shandong University, Jinan 250061, China;
    2. School of Thermal Engineering, Shandong Jianzhu University, Jinan 250101, China
  • Received:2009-08-09 Online:2010-04-16 Published:2009-08-09

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Abstract:

A 3D numerical simulation was carried out to study the fluid flow and heat transfer enhancement characteristics of flue inside a circular tube with spiral-twisted-tape(STT) and edge fold-twisted tape(ETT)  inserts. An enhanced wall treatment, a differential formula for the effective viscosity to account for the low Reynolds number effects and modification for moderate swirling flow were adopted. Rearranged from 2300 to 5000, the Nu of tube with STT inserts is 21%～24％ higher than that of   circular tube， and the Nu of tube with ETT inserts is 25%～32％ higher than that of the circular tube. The pressure drop of the tube with ETT inserts is from 12Pa to 57Pa, which is 10%～18％ higher than that of STT inserts. The thermalhydraulic performance of ETT is from 120％ to 126％. The heat enhancement reasons of ETT inserts is the characteristic of periodic velocity increases and decreases within an edgefold length.

Key words:  edgefold-twisted-tape inserts, spiral-twisted-tape inserts, numerical simulation, heat transfer enhancement

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