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Numerical Study of Heat Transfer Enhancement in Solar Air Heater Duct Fitted with Delta Winglets
The paper brings Numerical study of thermal performance of solar air heater channel in which delta winglet type vortex generators with and without holes punched on it are attached. Delta winglet type vortex generators having holes punched onto it are fitted in an array having 5 pair in one row, having 3 such rows starting at the entry of test section. With pitch of 60mm.Deltawinglet pair have an attack angle of 30 degrees, with height of winglet equal to half of duct height The study is carried out for Reynolds’s No in the range of 5000 to 25000 by changing airflow rate.in the test section with its upper channel wall provided with a uniform heat flux. Results are then compared with that of duct mounted with delta winglet without holes. Thermal performance is evaluated by analyzing both friction factor and Nussult’s number using R L Webb’s correlation for surfaces with roughness. Numerical simulation is done using Ansys fluent software. Analysis findings says that use of winglets brings enhancement in the heat transfer and thus increases the thermal performance. Arrangement of winglets also influences the performance. Improvements in design and performance can be brought by using winglets with different attack angles and span length.
Delta Winglet, Longitudinal Vortices, Thermal Enhancement Factor, Vortex Generator
- Gulshan S, Kasana KS. Thesis on computation of heat transfer augmentation in a plate-fin heat exchanger using rectangular / delta wing.
- Ferrouillat S, Tochon P, Garnier C, Peerhossaini H. Intensification of heat transfer and mixing in multifunctional heat exchangers by artificially generated stream wise vorticity. Applied Thermal Engineering. 2006; 26(16).
- Biswas G, Torii K, Fujii D, Nishino K. Numerical and experimental determination of flow structure and heat transfer effects of longitudinal vortices in a channel flow. International Journal of Heat and Mass Transfer. 1996; 39:3441–51.
- Biswas G, Deb P, Biswas S. Generation of longitudinal streamwise vortices: A device for improving heat exchanger design. Journal of Heat Transfer. 1994; 116:588–97.
- Tiggelbeck S, Mitra NK, Fiebig M. Comparison of wing type vortex generators for heat transfer enhancement in channel flows. Transactions of the ASME. 1994; 116:880–5.
- Fiebig M. Vortices, generators, and heat transfer. Transactions of Institute of Chemical Engineers. 1998; 76(Part-A):108–23.
- Chen Y, Fiebig M, Mitra NK. Heat transfer enhancement of a finned oval tube with punched longitudinal vortex generators in line. International Journal of Heat and Mass Transfer. 1998 Oct; 41(24):4151–66.
- Wang JS, Tang JJ, Zhang JF. Mechanism of heat transfer enhancement of semi-ellipse vortex generator. Chinese Journal of Mechanical Engineering. 2006; 42(5):160–4.
- Yadav AS, Bhagoria JL. Heat transfer and fluid flow analysis of solar air heater: A review of CFD approach. Renewable & Sustainable Energy Reviews. 2013; 23:60–79.
- Kamboj R, Dhingra S. CFD simulation of heat transfer enhancement by plain and curved winglet type vertex generators with punched holes. International Journal of Engineering Research and General Science. 2014 Jun–Jul; 2(4).
- Zhou GB, Ye QL. Experimental investigations of thermal and flow characteristics of curved trapezoidal-winglet type vortex generators. Applied Thermal Engineering. 2012; 37:241–8.
- Skullong S, Promvonge P. Experimental investigation on turbulent convection in solar air heater channel fitted with delta winglet vortex generator. Fluid Dynamics and Transport Phenomena Chinese Journal of Chemical Engineering. 2014; 22(1):1–10. DOI: 10.1016/S10049541(14)60030-6.
- Wu JM, Tao WQ. Numerical study on laminar convection heat transfer in a rectangular channel with longitudinal vortex generator. Part A: Verification of field synergy principle. International Journal of Heat and Mass Transfer. 2008; 51:1179–91.
- Webb RL, Eckert RG. Application of rough surfaces to heat exchanger design. International Journal of Heat and Mass Transfer. 1972; 15:1647–58.
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