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Keywords: friction factor
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Journal Articles
Article Type: Research-Article
J. Fluids Eng. May 2022, 144(5): 051403.
Paper No: FE-21-1287
Published Online: January 12, 2022
..., for Reynolds numbers between 190 and 22,000. Specialized instrumented rods were utilized to measure the local pressure drop and estimate the subchannels' friction factor. Three interior subchannels, one edge subchannel, and one corner subchannel were selected to study the effects of location and flow regimes...
Journal Articles
Article Type: Research-Article
J. Fluids Eng. November 2020, 142(11): 111211.
Paper No: FE-20-1180
Published Online: September 4, 2020
... subchannels of typical wire-wrapped assemblies with subsequent total or partial blockage of subchannel coolant flow. A test campaign was conducted to study the effects of localized blockages on the bundle averaged friction factor of a tightly packed wire-wrapped rod bundle. Blockages were installed within...
Journal Articles
Article Type: Research-Article
J. Fluids Eng. May 2019, 141(5): 051201.
Paper No: FE-18-1312
Published Online: November 8, 2018
...Navid Azizi; Reza Homayoon; Mahmoud Reza Hojjati Determination of friction factor (f) in pipe flow is necessary for various applications dealing with fluid flow. The Colebrook–White equation is the most accepted technique for the f-values estimation in turbulent flow. The biggest problem...
Journal Articles
Article Type: Technical Briefs
J. Fluids Eng. July 2013, 135(7): 074501.
Paper No: FE-12-1250
Published Online: May 17, 2013
..., 2013. Assoc. Editor: Mark F. Tachie. 18 05 2012 19 12 2012 Since the pressure losses in corrugated pipe flows are very high, their friction factor was investigated experimentally. Results of measurements of friction factor in laminar to turbulent transition zone of water flow...
Journal Articles
Article Type: Research-Article
J. Fluids Eng. March 2013, 135(3): 031201.
Paper No: FE-11-1252
Published Online: February 22, 2013
... (especially Mr. Joe Flenniken) at the Well Construction Technology Center of the University of Oklahoma for their assistance in the experimental work. Nomenclature A 1 , B 1 = constants in Eq. (10) d = pipe inside diameter (cm) f = Fanning friction factor (dimensionless) h...
Journal Articles
Article Type: Research-Article
J. Fluids Eng. December 2012, 134(12): 121202.
Published Online: November 20, 2012
... manuscript received August 3, 2012; published online November 20, 2012. Assoc. Editor: Frank C. Visser. 11 03 2012 03 08 2012 Turbulent flow in d-type corrugated pipes of various aspect ratios has been numerically investigated in terms of flow pattern and friction factor, for Reynolds...
Journal Articles
Article Type: Fundamental Issues And Canonical Flows
J. Fluids Eng. June 2012, 134(6): 061201.
Published Online: June 11, 2012
... or double-trapezoidal duct, m D diameter of circular duct, m D h hydraulic diameter = 4 A / P , m f Fanning friction factor =  τ / ( 1 2 ρ w ¯ 2 ) L channel length, m L arbitrary length scale of cross section, m N...
Journal Articles
Article Type: Research Papers
J. Fluids Eng. March 2011, 133(3): 031102.
Published Online: March 16, 2011
... ) f friction factor f (   ) probability density function h microchannel depth ( μ m ) H roughness height ( μ m ) l microchannel length ( μ m ) L e entrance length ( μ m...
Journal Articles
Article Type: Research Papers
J. Fluids Eng. August 2010, 132(8): 081101.
Published Online: August 2, 2010
... to correlate data from the small laboratory-scale tubing and large field-scale pipes. Correlation to predict Fanning friction factor of SB fluids in coiled tubing as a function of Deborah number and fluid flow behavior index is presented. Correlation is validated by comparing predictions with the experimental...
Journal Articles
Article Type: Research Papers
J. Fluids Eng. July 2010, 132(7): 071304.
Published Online: July 22, 2010
...-phase flow pressure loss friction factor slug flow experimental model Limited information is available and reported in the published literature on the hydrodynamics of two-phase, air-water flow in hydraulic structures such as pressurized flow tunnels and pipes, culverts, sewer pipes...
Journal Articles
Article Type: Research Papers
J. Fluids Eng. October 2009, 131(10): 101201.
Published Online: September 17, 2009
... solved with slip boundary conditions. The numerical methodology is based on the control volume scheme. Numerical results reveal that the compressibility effect increases the velocity gradient near the wall and the friction factor. On the other hand, the increment of velocity gradient near the wall leads...
Journal Articles
Article Type: Research Papers
J. Fluids Eng. July 2009, 131(7): 071202.
Published Online: June 16, 2009
... range of Reynolds numbers. Nikuradse’s data have become the metric by which theories are established and have also been the subject of intense scrutiny. Several subsequent experiments reported friction factors as much as 5% lower than those measured by Nikuradse, and the authors of those reports...
Journal Articles
Article Type: Research Papers
J. Fluids Eng. June 2009, 131(6): 061203.
Published Online: May 13, 2009
...Atakan Avci; Irfan Karagoz In this paper, we propose a novel explicit equation for friction factor, which is valid for both smooth and rough wall turbulent flows in pipes and channels. The form of the proposed equation is based on a new logarithmic velocity profile and the model constants...
Journal Articles
Article Type: Research Papers
J. Fluids Eng. May 2009, 131(5): 051301.
Published Online: April 10, 2009
...Shu-Qing Yang The mean velocity profile and friction factor in turbulent flows with polymer additives are investigated using Prandtl’s mixing-length theorem. This study reveals that the mixing-length theorem is valid to express the drag-reducing phenomenon and that the presence of polymer additives...
Journal Articles
Article Type: Research Papers
J. Fluids Eng. November 2008, 130(11): 111201.
Published Online: September 22, 2008
... ∗ = r i r o . laminar flow microchannel flow non-Newtonian flow pipe flow non-Newtonian flow power law fluid friction factor noncircular ducts laminar flow microchannels The present work is concerned with the prediction of pressure drop in noncircular ducts...
Journal Articles
Article Type: Research Papers
J. Fluids Eng. April 2008, 130(4): 041105.
Published Online: April 4, 2008
...Peter Vassallo; Paul Symolon Friction factor data for adiabatic cross flow of water in a staggered tube array were obtained over a Reynolds number range (based on hydraulic diameter and gap velocity) of about 10,000–250,000. The tubes were 12.7 mm ( 0.5 in. ) outer diameter in a uniformly spaced...
Journal Articles
Article Type: Technical Papers
J. Fluids Eng. October 2007, 129(10): 1255–1267.
Published Online: May 16, 2007
...Noor Afzal The friction factor data from transitional rough test pipes, from the measurements of Sletfjerding and Gudmundsson (2003, “Friction Factor Directly From Roughness Measurements,” J. Energy Resour. Technol. 125, pp. 126–130) , have been analyzed in terms of directly measurable roughness...
Journal Articles
Article Type: Technical Papers
J. Fluids Eng. October 2007, 129(10): 1268–1276.
Published Online: April 11, 2007
...Chungpyo Hong; Yutaka Asako; Stephen E. Turner; Mohammad Faghri Poiseuille number, the product of friction factor and Reynolds number (fRe) for quasi-fully-developed gas microchannel flow in the slip flow regime, was obtained numerically based on the arbitrary-Lagrangian-Eulerian method. Two...