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International Journal of Civil, Mechanical and Energy Science

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

Author(s):

Ali Alabdalah, Lubna Wnos

Keywords:

secondary flow, 90-degree elbow, CFD.

Abstract:

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.

ijaers doi crossrefDOI:

10.22161/ijcmes.64.1

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References:

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