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Numerical Simulation and Flow Analysis of a 90-Degree Elbow( Vol-6,Issue-4,July 2020 )


Ali Alabdalah, Lubna Wnos


secondary flow, 90-degree elbow, CFD.


Enhancing the heat transfer by using of curved has a great importance now adays, because the fluid dynamics inside curved tubes offer certain advantages over the straight tubes. The curved shape of tube causes the flowing fluid to experience centrifugal force which depends on its local axial velocity of the fluid particle. Due to boundary layer, the fluid particles flowing close to the tube wall have a lower velocity with respect to the fluid flowing in the core of the tube thus they are subject to a lower centrifugal force. This causes the fluid from the core region is pushed outwards forming a pair of recirculating counter-rotating vortices called secondary flow which enhances fluid mixing and thus heat transfer when compared to that in a straight tube. The aim of this work is to simulate the fluid flow in a 90-degree elbow with CFD analysis using NX-10 software. The temperature contours, static pressure contours and velocity vectors were plotted using NX-10. This contours have been analyzed and discussed to find out when the stream passing from the straight to the curved portion of the pipe is accompanied by an increase of the pressure at the outer wall and a decrease at the inner wall, and by a corresponding a decrease of the stream velocity at the outer wall and an increase at the inner wall.

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[1] Al-Rafai WN, Tridimas Y D, Woolley NH (1990). A study of turbulent flows in pipe bends. Journal of Mechanical Engineering Science 204:399-408.
[2] Hellstrom LHO, Sinha A, Smits AJ (2011). Visualizing the very-large-scale motions in turbulent pipe flow. Physics of Fluids 23:011703.
[3] Weske JR, (1948). Experimental Investigation of Velocity Distributions Downstream of Single Duct Bends. NACA TN-1471, USA.
[4] Yadav MS (2013). Interfacial Area Transport across Vertical Elbows in Air-water Two-phase Flow. Ph. D thesis, PSU, USA
[5] L. Zhi, M. Xianju, and L. Shaofeng (2008). Theoretic research on elbow ducts based on the N-S equation. Journal of Hebei Polytechnic University, vol. 30, no. 1, pp. 41–45.
[6] Hoyas.S.C , and Alabdalah.A , Erasmus Mundus Partnership -Action 2 Lot -Syria “integrated studies for Syrian and European universities” grant agreement nuber 2014-0845001 - 001/, CFD Simulations of burners 23\08\2015-20\06\2016