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Convection Enhancement Using Composite Vortex Generator | ||
| AUT Journal of Mechanical Engineering | ||
| مقاله 10، دوره 6، شماره 1، خرداد 2022، صفحه 149-164 اصل مقاله (2.02 M) | ||
| نوع مقاله: Research Article | ||
| شناسه دیجیتال (DOI): 10.22060/ajme.2021.20158.5992 | ||
| نویسندگان | ||
| S. A. Gandjalikhan Nassab* ؛ M Moein Addini | ||
| Department of Mechanical Engineering, Shahid Bahonar University of Kerman, Kerman, Iran | ||
| چکیده | ||
| This paper presents an original concept of using a composite flexible flapping vortex generator mounted on a heat sink fin for air side heat transfer augmentation. The main aim is to combine the advantages of hard and soft winglets in a composite one for having the highest possible enhancement. The proposed composite vortex generator, which is made with a thin elastic sheet is responsible for enhancing heat transfer and mixing quality performances in laminar convection air flow in a heat sink. The merged vortical structures due to oscillation by winglet swept out the thermal boundary layer and enhance thermal mixing between the fluid near the heated fin and the channel core flow. This novel concept is demonstrated using numerical simulation of the flow field with considering a two-way strongly coupled fluid-solid interaction approach in transient condition. The set of governing equations including, the continuity, momentum, and energy for a 2-D forced convection air flow are solved by the finite element method using the COMSOL Multi-Physics. The present findings show 148%, 116%, and 121% increases in the cooling rate by the composite and the two hard and soft homogeneous winglets, respectively. Numerical results are validated against the numerical data reported in the literature. | ||
| کلیدواژهها | ||
| Convection augmentation؛ Composite vortex generator؛ Flapping mode؛ Heat sink | ||
| مراجع | ||
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[1] A. Beskok, M. Raisee, B. Celik, B. Yagiz, M. Cheraghi, Heat transfer enhancement in a straight channel via a rotationally oscillating adiabatic cylinder, International Journal of Thermal Sciences, 58 (2012) 61-69.
[2] J. Shi, J. Hu, S.R. Schafer, C.-L. Chen, Numerical study of heat transfer enhancement of channel via vortex-induced vibration, Applied Thermal Engineering, 70(1) (2014) 838-845.
[3] J.S. Go, Design of a microfin array heat sink using flow-induced vibration to enhance the heat transfer in the laminar flow regime, Sensors and Actuators A: Physical, 105(2) (2003) 201-210.
[4] C.B. Allison, B.B. Dally, Effect of a delta-winglet vortex pair on the performance of a tube–fin heat exchanger, International Journal of Heat and Mass Transfer, 50(25) (2007) 5065-5072.
[5] S. Ali, C. Habchi, S. Menanteau, T. Lemenand, J.-L. Harion, Three-dimensional numerical study of heat transfer and mixing enhancement in a circular pipe using self-sustained oscillating flexible vorticity generators, Chemical Engineering Science, 162 (2017) 152-174.
[6] Z. Li, X. Xu, K. Li, Y. Chen, G. Huang, C.-l. Chen, C.-H. Chen, A flapping vortex generator for heat transfer enhancement in a rectangular airside fin, International Journal of Heat and Mass Transfer, 118 (2018) 1340-1356.
[7] S. Ali, S. Menanteau, C. Habchi, T. Lemenand, J.-L. Harion, Heat transfer and mixing enhancement by using multiple freely oscillating flexible vortex generators, Applied Thermal Engineering, 105 (2016) 276-289.
[8] R.K.B. Gallegos, R.N. Sharma, Heat transfer performance of flag vortex generators in rectangular channels, International Journal of Thermal Sciences, 137 (2019) 26-44.
[9] J.B. Lee, S.G. Park, B. Kim, J. Ryu, H.J. Sung, Heat transfer enhancement by flexible flags clamped vertically in a Poiseuille channel flow, International Journal of Heat and Mass Transfer, 107 (2017) 391-402.
[10] S.G. Park, Heat transfer enhancement by a wall-mounted flexible vortex generator with an inclination angle, International Journal of Heat and Mass Transfer, 148 (2020) 119053.
[11] P. Le Tallec, J. Mouro, Fluid structure interaction with large structural displacements, Computer Methods in Applied Mechanics and Engineering, 190(24) (2001) 3039-3067.
[12] W.B. Zimmerman, Multiphysics modeling with finite element methods, World Scientific Publishing Company, 2006.
[13] O.C. Zienkiewicz, R.L. Taylor, P. Nithiarasu, J. Zhu, The finite element method, McGraw-hill London, 1977.
[14] R. Gopalkrishnan, M.S. Triantafyllou, G.S. Triantafyllou, D. Barrett, Active vorticity control in a shear flow using a flapping foil, Journal of Fluid Mechanics, 274 (1994) 1-21.
[15] S. Ali, C. Habchi, T. Lemenand, J.-L. Harion, Towards self-sustained oscillations of multiple flexible vortex generators, Fluid Dynamics Research, 51(2) (2019) 025507. | ||
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