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International Journal of Fluid Mechanics Research
ESCI SJR: 0.206 SNIP: 0.446 CiteScore™: 0.9

ISSN Imprimer: 2152-5102
ISSN En ligne: 2152-5110

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International Journal of Fluid Mechanics Research

DOI: 10.1615/InterJFluidMechRes.v36.i4.60
pages 375-390

Flow Characteristics of Double Offset S-Shaped Circular Diffusing Duct

Rajesh K. Singh
Department of Applied Mechanics, IIT Delhi, New Delhi-110016
S. N. Singh
Department of Applied Mechanics, IIT Delhi Hauz Khas, New Delhi, India
V. Seshadri
Department of Applied Mechanics, IIT Delhi Hauz Khas, New Delhi, India

RÉSUMÉ

Effect of Reynolds number and horizontal offset for a fixed vertical offset has been investigated for a double offset S-shaped circular diffusing duct using a CFD code FLUENT. The investigations have been carried out for a fixed geometry using different turbulence models and it is observed that the RNG turbulence model gives the closest matching with experimental results. Investigations have shown that at high Reynolds numbers (≈ 106), there is no effect of Reynolds number on the performance of the diffuser. Secondary flow distribution has shown the formation of two pairs of contra rotating vortices at the exit plane and beyond. The core of the flow moves along the diagonal plane which is inclined to vertical axis at an angle determined by the magnitude of horizontal offset i. e. 15°/15° offset gives an angle of 30° whereas 30°/30° offset gives an angle of approximately 60°.


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