Investigation on laminar convection heat transfer in fin-and-tube heat exchanger in aligned arrangement with longitudinal vortex generator from the viewpoint of field synergy principle |
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| Affiliation: | 1. State Key Laboratory of Multiphase Flow in Power Engineering, School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an City 710049, China;2. School of Environment and Chemical Engineering, Xi’an University of Engineering Science and Technology, Xi’an City 710048, China;1. Key Laboratory of Thermo-Fluid Science and Engineering of MOE, School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an, China;2. Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, IL, USA;1. School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China;2. Department of Mechanical Engineering, Shizuoka University, 3-5-1 Johoku, Hamamatsu 432-8561, Japan;1. School of Energy Science and Engineering, Harbin Institute of Technology, Harbin, 150001, China;2. Division of Heat Transfer, Department of Energy Sciences, Lund University, Lund, 22100, Sweden;1. Xidian-Ningbo Information Technology Institute, Xidian University, Xi’an 710071, China;2. School of Electromechanical Engineering, Xidian University, Xi’an 710071, China;3. Key Laboratory of Thermo-Fluid Science and Engineering of Ministry of Education, Xi’An Jiaotong University, Xi’an 710071, China;4. Department of Mechanical Engineering, University of Alberta, Edmonton, AB T6G 1H9, Canada |
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| Abstract: | 3-D numerical simulation results are presented for laminar flow heat transfer of the fin-and-tube surface with vortex generators. The effects of Reynolds number (from 800 to 2000), the attack angle (30° and 45°) of delta winglet vortex generator are examined. The numerical results are analyzed from the viewpoint of field synergy principle. It is found that the inherent mechanism of heat transfer enhancement by longitudinal vortex can be explained by the field synergy principle, the second flow generated by the vortex generators results in the reduction of the intersection angle between the velocity and fluid temperature gradient. In addition, the heat transfer enhancement of delta winglet with the attack angle of 45° is larger than that of 30°, while the delta winglet with the attack angle of 45° results in an increase of the pressure drop, however, the delta winglet with the attack angle of 30° results in a slight decrease. |
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