..., 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...

... 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...

...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...

...://www.ppgem.ct.utfpr.edu.br/lacit/publicacoes/congressos/2008ENCIT-Numerical%20Simulation%20of%20Turbulent%20Flow%20in%20Corrugated%20Pipes.pdf [7] Pisarenko , M. , Van der Linden , B. , Tijsseling , A. , Ory , E. , and Dam , J. , 2011 , “ Friction Factor Estimation for Turbulent Flows in Corrugated...

... envelope can be used to evaluate drag reduction characteristics of SB fluids. surfactant straight tubing coiled tubing friction factor drag reduction MDR asymptote The term surfactant is derived from the words surface-active agent. A surface-active agent is a chemical that tends...

... 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...

.... The dimensionless mean wall shear stress is presented graphically and appears more general and reasonable to reflect the fluid flow physical behavior than the traditional Moody diagram. 24 01 2011 18 04 2012 11 06 2012 11 06 2012 turbulent flow pressure drop friction factor...

... – 295 . 10.1115/1.2820647 Wu , H. Y. , and Cheng , P. , 2003 , “ Friction Factors in Smooth Trapezoidal Silicon Microchannels With Different Ratios ,” Int. J. Heat Mass Transfer 0017-9310 , 46 ( 14 ), pp. 2519 – 2525 . 10.1016/S0017-9310(03)00106-6 Hao , P. F. , He...

... 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...

... of nonaerated flow Δ P pressure loss α void fraction β relative discharge defined as Q a / Q w ε pipe absolute roughness φ phase concentration λ friction coefficient λ 0 friction factor of single phase...

... 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...

... 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...

...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...

...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...

... 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 for non-Newtonian power law fluids. Much...

...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...

...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...

...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...