The pressure drop across sharp-angled miter elbows connecting straight circular pipes is studied in a bespoke experimental facility by using water and air as working fluids flowing in the range of bulk Reynolds number . To the best of our knowledge, the dependence on the Reynolds number of the pressure drop across the miter elbow scaled by the dynamic pressure, i.e., the pressure-loss coefficient , is reported herein for the first time. The coefficient is shown to decrease sharply with the Reynolds number up to about and, at higher Reynolds numbers, to approach mildly a constant , which is about 20% lower than the currently reported value in the literature. We quantify this relation and the dependence between and the straight-pipe friction factor at the same Reynolds number through two new empirical correlations, which will be useful for the design of piping systems fitted with these sharp elbows. The pressure drop is also expressed in terms of the scaled equivalent length, i.e., the length of a straight pipe that would produce the same pressure drop as the elbow at the same Reynolds number.
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June 2018
Research-Article
Pressure-Loss Coefficient of 90 deg Sharp-Angled Miter Elbows
Wameedh T. M. Al-Tameemi,
Wameedh T. M. Al-Tameemi
Department of Mechanical Engineering,
University of Sheffield,
Sheffield S1 4ET, UK;
University of Sheffield,
Sheffield S1 4ET, UK;
Reconstruction and Projects Office,
Ministry of Higher Education and
Scientific Research,
Baghdad, Iraq
e-mail: wtal-tameemi1@sheffield.ac.uk
Ministry of Higher Education and
Scientific Research,
Baghdad, Iraq
e-mail: wtal-tameemi1@sheffield.ac.uk
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Pierre Ricco
Pierre Ricco
Department of Mechanical Engineering,
University of Sheffield,
Sheffield S1 4ET, UK
e-mail: p.ricco@sheffield.ac.uk
University of Sheffield,
Sheffield S1 4ET, UK
e-mail: p.ricco@sheffield.ac.uk
Search for other works by this author on:
Wameedh T. M. Al-Tameemi
Department of Mechanical Engineering,
University of Sheffield,
Sheffield S1 4ET, UK;
University of Sheffield,
Sheffield S1 4ET, UK;
Reconstruction and Projects Office,
Ministry of Higher Education and
Scientific Research,
Baghdad, Iraq
e-mail: wtal-tameemi1@sheffield.ac.uk
Ministry of Higher Education and
Scientific Research,
Baghdad, Iraq
e-mail: wtal-tameemi1@sheffield.ac.uk
Pierre Ricco
Department of Mechanical Engineering,
University of Sheffield,
Sheffield S1 4ET, UK
e-mail: p.ricco@sheffield.ac.uk
University of Sheffield,
Sheffield S1 4ET, UK
e-mail: p.ricco@sheffield.ac.uk
Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received August 26, 2017; final manuscript received December 12, 2017; published online January 30, 2018. Assoc. Editor: Moran Wang.
J. Fluids Eng. Jun 2018, 140(6): 061102 (7 pages)
Published Online: January 30, 2018
Article history
Received:
August 26, 2017
Revised:
December 12, 2017
Citation
Al-Tameemi, W. T. M., and Ricco, P. (January 30, 2018). "Pressure-Loss Coefficient of 90 deg Sharp-Angled Miter Elbows." ASME. J. Fluids Eng. June 2018; 140(6): 061102. https://doi.org/10.1115/1.4038986
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