Turbulent Flow of Power-Law Fluids Through Circular Pipes

AIAA Journal ◽  
2002 ◽  
Vol 40 (1) ◽  
pp. 181-185
Author(s):  
Z. U. A. Warsi
Keyword(s):  
Turbulent Flow ◽  
Power Law ◽  
Circular Pipes ◽  
Power Law Fluids

CFD and Experimental Studies of Yield Power-Law Fluids in Turbulent Pipe Flow

2018 ◽  
Author(s):  
Abdalsalam Ihmoudah ◽  
M. A. Rahman ◽  
Stephen D. Butt
Keyword(s):  
Turbulent Flow ◽  
Power Law ◽  
Pressure Loss ◽  
Xanthan Gum ◽  
Newtonian Fluids ◽  
Turbulent Pipe Flow ◽  
Flow Loop ◽  
Horizontal Pipe ◽  
Cfd Models ◽  
Power Law Fluids

The transport of Non-Newtonian fluids through pipelines and mud circulation in wellbores often occur in turbulent flow regimes. In this study, experiments and computational fluid dynamics (CFD) models are used to examine the influence of yield power law (YPL) fluid rheological properties on pressure loss in the flow loop in turbulent flow. Three Non-Newtonian fluids at different concentrations of Xanthan gum solutions (0.05%, 0.10% and 0.15%, by weight) are studied at flow rates ranging between 400 and 800 L/min. A fully instrumented flow loop system was used, consisting of three main sections of different inclinations: 5 m long horizontal, 5 m vertical, and 3 m inclined 45° test section. Additionally, CFD codes of ANSYS CFX 17.2 are examined and compared to experimental results. These models are based on the Reynolds Averaged Navier-Stokes (RANS) equations. The comparison is done with the results of these investigations, based on vertical and horizontal pipe frictional pressure drops. The results show that the gap between experimental and CFD models has been increased in comparison with increase concentration Xanthan gum solution at the same density of fluids. Specifically, pressure loss rises with rises in the consistency index, k and flow behaviour index, However, rises in yield stress τ0 showed less impacts on frictional pressure losses. Given these simulation outcomes, it is clear that pressure drop in the Non-Newtonian fluid in one phase flow can be more accurately predicted by used the Reynolds-Stress Models (RSM) more than Eddy-viscosity models.

Skin friction of power law fluids in turbulent flow over a flat plate

AIChE Journal ◽  
1966 ◽  
Vol 12 (4) ◽  
pp. 637-641 ◽  
Author(s):  
A. T. McDonald ◽  
Harry Brandt
Keyword(s):  
Turbulent Flow ◽  
Flat Plate ◽  
Skin Friction ◽  
Power Law ◽  
Power Law Fluids

Turbulent Flow of Power-Law Fluids

1975 ◽  
Vol 101 (7) ◽  
pp. 885-900
Author(s):  
Abdul I. Y. Mohammed ◽  
Narendra N. Gunaji ◽  
Phillip R. Smith
Keyword(s):  
Turbulent Flow ◽  
Power Law ◽  
Power Law Fluids

Modeling Turbulent Flow of Non-Newtonian Fluids Using Generalized Newtonian Models

2015 ◽  
Author(s):  
Majid Bizhani ◽  
Ergun Kuru
Keyword(s):  
Turbulent Flow ◽  
Turbulence Model ◽  
Power Law ◽  
Pressure Loss ◽  
Fluid Dynamic ◽  
Turbulence Models ◽  
Velocity Profiles ◽  
Newtonian Fluids ◽  
Generalized Newtonian Fluid ◽  
Power Law Fluids

Computational Fluid Dynamic (CFD) is used to model turbulent flow of non-Newtonian polymeric fluids in concentric annulus. The so called Generalized Newtonian Fluid (GNF) approach is used. Four turbulence models are tested. Applicability of each model in predicting turbulent flow of non-Newtonian fluids in annulus is assessed by comparing results of pressure loss and or velocity profiles with experimental data. The first tested model is a modified version of Lam-Bremhorst k–ε turbulence model. The modification was originally developed to model flow of power law fluids in smooth circular pipes. Results of simulation study showed that this model significantly overestimates the pressure losses. Two k–ε closure type turbulence models, one developed to model turbulent flow of Herschel-Buckley and the other for power law fluids, are shown to fail in predicting turbulent flow of polymer solutions. One of the models contains a damping function which is analyzed to show its inadequacy in damping the eddy viscosity. The last tested model is a one layer turbulence model developed for predicting turbulent flow in annular passages. The model has an adjustable parameter, which is shown to control the slope of velocity profiles in the logarithmic region. It is demonstrated that if the model constant is selected carefully, the model accurately predicts pressure loss and velocity profiles.

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