Experimental determination and computational fluid dynamics predictions of pressure loss in close-coupled elbows (RP-1682)

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Abstract

An experimental program was implemented to study pressure losses in HVAC duct systems associated with 305 mm (12 in.) diameter close-coupled round five-gore elbows. The goal of this program was to experimentally verify a computational fluid dynamics model to accurately predict pressure losses in order to design duct systems more effectively. The results of this study showed that the loss coefficient increased as a function of separation distance between the elbows in a Z-configuration and decreased in a U-configuration. For both 305 mm (12 in.) and 203 mm (8 in.) diameter elbows, power law expressions correlating the combination loss coefficient data as a function of intermediate length for close-coupled elbows arranged in a Z-configuration or a U-configuration were presented. Computational fluid dynamics modeling with enhanced wall treatment using the k-ϵ method was generally able to correctly predict elbow loss coefficients with an error of less than 15%.

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Salehi, M., Idem, S., & Sleiti, A. (2017). Experimental determination and computational fluid dynamics predictions of pressure loss in close-coupled elbows (RP-1682). Science and Technology for the Built Environment, 23(7), 1132–1141. https://doi.org/10.1080/23744731.2016.1268904

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