In this paper, three-dimensional numerical simulations with renormalization-group (RNG) model are performed for the air-side heat transfer and fluid flow characteristics of wavy fin-and-tube heat exchanger with delta winglet vortex generators. The Reynolds number based on the tube outside diameter varies from 500 to 5000. The effects of different geometrical parameters with varying attack angle of delta winglet (, , and ), tube row number (2–4), and wavy angle of the fin are examined. The numerical results show that each delta winglet generates a downstream main vortex and a corner vortex. The longitudinal vortices are disrupted by the downstream wavy trough and only propagate a short distance along the main flow direction but the vortices greatly enhance the heat transfer in the wake region behind the tube. Nusselt number and friction factor both increase with the increase in the attack angle , and the case of has the maximum value of . The effects of the tube row number on Nusselt number and friction factor are very small, and the heat transfer and fluid flow become fully developed very quickly. The case of has the minimum value of Nusselt number, while friction factor always increases with the increase in wavy angle. The application of delta winglet enhances the heat transfer performance of the wavy fin-and-tube heat exchanger with modest pressure drop penalty.
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September 2009
This article was originally published in
Journal of Heat Transfer
Research Papers
Numerical Study of Flow and Heat Transfer Enhancement by Using Delta Winglets in a Triangular Wavy Fin-and-Tube Heat Exchanger
Liting Tian,
Liting Tian
State Key Laboratory of Multiphase Flow in Power Engineering, School of Energy and Power Engineering,
Xi’an Jiaotong University
, Xi’an 710049, China
Search for other works by this author on:
Yaling He,
Yaling He
State Key Laboratory of Multiphase Flow in Power Engineering, School of Energy and Power Engineering,
e-mail: yalinghe@mail.xjtu.edu.cn
Xi’an Jiaotong University
, Xi’an 710049, China
Search for other works by this author on:
Pan Chu,
Pan Chu
State Key Laboratory of Multiphase Flow in Power Engineering, School of Energy and Power Engineering,
Xi’an Jiaotong University
, Xi’an 710049, China
Search for other works by this author on:
Wenquan Tao
Wenquan Tao
State Key Laboratory of Multiphase Flow in Power Engineering, School of Energy and Power Engineering,
Xi’an Jiaotong University
, Xi’an 710049, China
Search for other works by this author on:
Liting Tian
State Key Laboratory of Multiphase Flow in Power Engineering, School of Energy and Power Engineering,
Xi’an Jiaotong University
, Xi’an 710049, China
Yaling He
State Key Laboratory of Multiphase Flow in Power Engineering, School of Energy and Power Engineering,
Xi’an Jiaotong University
, Xi’an 710049, Chinae-mail: yalinghe@mail.xjtu.edu.cn
Pan Chu
State Key Laboratory of Multiphase Flow in Power Engineering, School of Energy and Power Engineering,
Xi’an Jiaotong University
, Xi’an 710049, China
Wenquan Tao
State Key Laboratory of Multiphase Flow in Power Engineering, School of Energy and Power Engineering,
Xi’an Jiaotong University
, Xi’an 710049, ChinaJ. Heat Transfer. Sep 2009, 131(9): 091901 (8 pages)
Published Online: June 22, 2009
Article history
Received:
April 22, 2008
Revised:
April 15, 2009
Published:
June 22, 2009
Citation
Tian, L., He, Y., Chu, P., and Tao, W. (June 22, 2009). "Numerical Study of Flow and Heat Transfer Enhancement by Using Delta Winglets in a Triangular Wavy Fin-and-Tube Heat Exchanger." ASME. J. Heat Transfer. September 2009; 131(9): 091901. https://doi.org/10.1115/1.3139106
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