... Submersible Pump ,” M.S. thesis, Texas A&M University, College Station, TX. The Modified Affinity Law is further extended to include the effect of viscosity on power input and efficiency. The presented approach is a unique blend of affinity laws and friction loss modeling analogous...

...Tae Jin Kim; Ravitej Kanapuram; Arnav Chhabra; Carlos Hidrovo Microtextured superhydrophobic surfaces have shown potential in friction reduction applications and could be poised to make a significant impact in thermal management applications. The purpose of this paper is to account for the thermal...

...Noor Afzal Table 1 Roughness scale and friction factors in fully rough and transitional rough pipes Scale Friction factor for fully rough pipes Friction factor for transitional rough pipes implicit and approximate explicit expressions; ( j = 11 ) 1 Eq. R...

... the problem in a general porous medium for which both inertial and boundary-friction effects affect the flow and heat transfer physics. In order to serve this aim, the influence of Da, M, and F on the dimensionless velocity and temperature profiles, as well as Nusselt number, are investigated. 15 02...

... in the overlap region is carried out by the Izakson-Millikan-Kolmogorov hypothesis. The velocity profiles and skin friction are shown to be governed by universal log laws as well as by universal power laws, explicitly independent of surface roughness, having the same constants as a fully smooth surface wall jet...

...E. L. Amromin; B. Metcalf; G. Karafiath Friction on a surface covered by an air cavity is much less than friction in water but there is a resistance penalty caused by the cavity tail oscillations. Nevertheless, there is a method for designing the ship bottom form for suppressing these oscillations...

...Irfan Karagoz; Atakan Avci 09 10 2010 22 11 2010 01 02 2011 01 02 2011 friction pipe flow pipes turbulence The discussion made by Tajadura and Gonzales ( 1 ) necessitates the clarification of the comments about our paper ( 2 ). The same notation and comment...

...Rafael Ballesteros-Tajadura; José González This paper shows a comparison of the most classic and historical formulations to obtain the friction factor for cylindrical pipes with novel approaches. Although there has been some evolution of the expressions, basically, the ideas and results remain very...

.... A stress limiter in the form of Durbin’s T -limit modification for eddy-viscosity models is implemented for the k − ω model, and its effect on the computed surface pressures, skin friction, and surface flow features is assessed. Additionally, the effect of the T -limit modification on both the mean flow...

...Karen A. Flack; Michael P. Schultz A review of predictive methods used to determine the frictional drag on a rough surface is presented. These methods utilize a wide range of roughness scales, including roughness height, pitch, density, and shape parameters. Most of these scales were developed...

... of the valve overlap and that there are smooth pressure control characteristics in the range of the two notches. The VFS valve with a spool was shown to have an unavoidable and unique hysteresis, which is caused by the nonlinear electromagnetic forces at the end of strokes of the spool and by the friction...

... conservation equation in the entrainment and roller regions, and the energy conservation equation after the jump are corrected to account for friction. The streamwise coordinate is related to the increase in the density layer height through a linear expression derived from CFD calculations. Three regimes...

... that the entrance friction factor Reynolds product is of finite value and dependent on the Kn and tangential momentum accommodation coefficient but independent of the cross-sectional geometry. Slip flow and continuum flow in the hydrodynamic entrance of noncircular microchannels has been examined and a model...

... 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...

... such as sand, wax, debris, and corrosion products in pipe flows. The influence of duct cross section on dimensionless velocity profile, dimensionless pressure drop, and friction factor has been reported. Finally based on the analytical solutions three new correlations have been proposed for the product...

... 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...

..., void fraction, and friction pressure drop data obtained with the T-junction inlet were found to be significantly different from those obtained previously with a reducer inlet. For the T-junction inlet, the two-phase flow patterns in the microchannel were predominantly intermittent flows with short gas...

...Mohsen Akbari; David Sinton; Majid Bahrami Pressure driven liquid flow through rectangular cross-section microchannels is investigated experimentally. Polydimethylsiloxane microchannels are fabricated using soft lithography. Pressure drop data are used to characterize the friction factor over...