Optimization of the angle of attack of delta-winglet vortex generators in a plate-fin-and-tube heat exchanger |
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| Authors: | A. Lemouedda M. Breuer E. Franz T. Botsch A. Delgado |
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| Affiliation: | 1. Department of Process Engineering, Georg-Simon-Ohm University of Applied Sciences, Wassertorstr. 10, D-90489 Nürnberg, Germany;2. Institute of Fluid Mechanics, Friedrich-Alexander University of Erlangen-Nürnberg, Cauerstr. 4, D-91056 Erlangen, Germany;3. Department of Fluid Mechanics, Institute of Mechanics, Helmut-Schmidt-University Hamburg, Holstenhofweg 85, D-22043 Hamburg, Germany;1. School of Chemical, Petroleum, and Gas Engineering, Semnan University, Semnan 35131-19111, Iran;2. Materials and Energy Research Center (MERC), Karaj, Iran;1. Central Mechanical Engineering Research Institute (CSIR), Durgapur 713209, India;2. Department of Mechanical Engineering, National Institute of Technology, Durgapur 713209, India;3. Department of Mechanical Engineering, Jadavpur University, Kolkata 700032, India;1. Ghent University, Department of Flow, Heat and Combustion Mechanics, Sint-Pietersnieuwstraat 41, 9000 Gent, Belgium;2. NV Bekaert SA, Bekaertstraat 2, 8550 Zwevegem, Belgium |
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| Abstract: | Delta-winglet vortex generators (VGs) are known to enhance the heat transfer between the energy-carrying fluid and the heat transfer surfaces in plate-fin-and-tube banks. In this study optimal angles of attack of the delta-winglets are investigated based on the Pareto optimal strategy. The optimization process combines a CFD analysis, genetic algorithms and the response surface methodology. The angle of attack of a pair a delta-winglet-type VGs mounted behind each tube is varied between β = ?90° and +90°. Three circular tube rows with inline and staggered tube arrangements are investigated for Reynolds numbers from 200 to 1200 (based on the inlet height and inlet velocity). The flow structure and heat transfer behavior is analyzed in detail for certain cases and the staggered and the inline tube arrangements are compared. Finally, for each of these arrangements the optimal sets of angles of attack for different Reynolds numbers are presented. |
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