NDLI: Experimental and Computational Analyses of Pressure Differentials in Flexible Ducts With Different Bent Angles

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Ray, R. Taghavi Jin, Wonjin Mario, A. Medina
Copyright Year	2007
Abstract	A set of experimental analyses was conducted to determine static pressure drops inside non-metallic flexible, spiral wire helix core ducts, with different bent angles. In addition, Computational Fluid Dynamics (CFD) solutions were performed and verified by comparing them to the experimental data. The CFD computations were carried out to produce more systematic pressure drop information through these complex-geometry ducts. The experimental setup was constructed according to ASHRAE Standard 120-1999. Five different bent angles (0, 30, 45, 60, and 90 degrees) were tested at relatively low flow rates (11 to 89 CFM). Also, two different bent radii and duct lengths were tested to study flexible duct geometrical effects on static pressure drops. FLUENT 6.2, using RANS based two equations - RNG k-ε model, was used for the CFD analyses. The experimental and CFD results showed that larger bent angles produced larger static pressure drops in the flexible ducts. CFD analysis data were found to be in relatively good agreement with the experimental results for all bent angle cases. However, the deviations became slightly larger at higher velocity regimes and at the longer test sections. Overall, static pressure drop for longer length cases were approximately 0.01in.H2O higher when compared to shorter cases because of the increase in resistance to the flow. Also, the CFD simulations captured more pronounced static pressure drops that were produced along the sharper turns. The stronger secondary flows, which resulted from higher and lower static pressure distributions in the outer and inner surfaces, respectively, contributed to these higher pressure drops.
Sponsorship	Fluids Engineering Division
Starting Page	527
Ending Page	534
Page Count	8
File Format	PDF
ISBN	0791842894
DOI	10.1115/FEDSM2007-37652
e-ISBN	0791838056
Volume Number	Volume 2: Fora, Parts A and B
Conference Proceedings	ASME/JSME 2007 5th Joint Fluids Engineering Conference
Language	English
Publisher Date	2007-07-30
Publisher Place	San Diego, California, USA
Access Restriction	Subscribed
Subject Keyword	Water Computational fluid dynamics Ducts Wire Pressure Flow (dynamics) Geometry Simulation Pressure drop Computation Reynolds-averaged navier–stokes equations Experimental analysis Engineering simulation
Content Type	Text
Resource Type	Article

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