A Computational Analysis of Flow Development Through a Constant Area S-Duct

A. K. Biswas(1*), Prasanta K. Sinha(2), A. N. Mullick(3), B. Majumdar(4)

(1) Department of Mechanical Engineering, National Institute of Technology, Durgapur – 713 212, India
(2) Department of Mechanical Engineering, Durgapur Institute of Advanced Technology & Mangt., Durgapur, India
(3) Department of Mechanical Engineering, National Institute of Technology, Durgapur – 713 212, India
(4) Department of Power Engineering, Jadavpur University, Kolkata Jadavpur, India
(*) Corresponding author


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Abstract


In the present investigation the distribution of wall static pressure and mean velocity are experimentally studied on a S-shape constant area rectangular curved duct of 45°/45° angle of turn with an aspect ratio of 2.0.  The experiment is carried out at mass averaged mean velocity of 40m/s. The velocity distribution shows the bulk flow shifting from outer wall to the inner wall in the first half and from inner wall to the outer wall in the second half along the flow passage of sigmoid duct is very instinct. Due to the imbalance of centrifugal force and radial pressure gradient, secondary motions in the form of counter rotating vortices have been generated within the curved duct. The experimental results then were numerically validated with the help of Fluent, which shows a good agreement between the experimental and predicted results.
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Keywords


Constant Area S-Duct; Secondary Motion; Wall Pressure; k-ε Model; Fluent Solver

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