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TECHNICAL PAPERS

Direct Design of Ducts

[+] Author and Article Information
A. Ashrafizadeh, G. D. Raithby, G. D. Stubley

Department of Mechanical Engineering, University of Waterloo, Waterloo, ON N2L 3G1, Canada

J. Fluids Eng 125(1), 158-165 (Jan 22, 2003) (8 pages) doi:10.1115/1.1514201 History: Received September 05, 2001; Revised June 04, 2002; Online January 22, 2003
Copyright © 2003 by ASME
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References

Figures

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Categorization of ducts
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A 90 deg curved nozzle. Calculated (solid curves) and target (dashed curves) wall velocities are shown in (b).
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A 90 deg curved diffuser. Calculated (solid curves) and target (dashed curves) wall velocities are shown in (b).
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Coarse mesh showing initial and final node locations
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Definition sketch showing spines used for grid generation
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Validation using the Stanitz’ elbow problem. Initial guessed shape (a), initial wall velocity (b), and designed shape (c) for TVD in (d). Dashed line in (c) is Stanitz’ solution, 4.
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Design of a straight nozzle. Initial guessed shape (a) and initial wall velocity (b). (c) and (e) are designed shapes for the TVDs in (d) and (f), respectively.
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Design of a straight diffuser. Initial guessed shape (a) and initial wall velocity (b). (c) and (e) are designed shapes for the TVDs in (d) and (f), respectively.
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Design of a 90 deg curved nozzle. Initial guessed shape (a), initial wall velocity (b), and designed shape (c) for TVD in (d).
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Design of a 90 deg uniform elbow. Initial guessed shape (a), initial wall velocity (b) and designed shape (c) for TVD in (d).
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Design of a 90 deg curved diffuser. Initial guessed shape (a), initial wall velocity (b), and designed shape (c) for TVD in (d).
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Design of a contracting S-bend. Initial guessed shape (a), initial wall velocity (b), and designed shape (c) for TVD in (d).
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Design of an expanding S-bend. Initial guessed shape (a), initial wall velocity (b), and designed shape (c) for TVD in (d). Data in (d) are from 3.

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