Improvement of drag reduction prediction in viscoelastic pipe flows using proper low-Reynoldsk-εturbulence models

2019 ◽  
Vol 516 ◽  
pp. 412-422 ◽  
Author(s):  
Ehsan Rasti ◽  
Farhad Talebi ◽  
Kiumars Mazaheri
Keyword(s):  
Drag Reduction ◽  
Pipe Flows

On the link between experimentally‐measured turbulence quantities and polymer‐induced drag reduction in pipe flows

AIChE Journal ◽  
2019 ◽  
Vol 65 (9) ◽  
Author(s):  
Victor Voulgaropoulos ◽  
Ivan Zadrazil ◽  
Niccolò Le Brun ◽  
Alexander Bismarck ◽  
Christos N. Markides
Keyword(s):  
Drag Reduction ◽  
Pipe Flows ◽  
Induced Drag

DRAG REDUCTION IN TURBULENT PIPE FLOWS WITH POLYMER-POLYMER MIXTURES

2015 ◽  
Author(s):  
Gustavo Alonso Barrientos Sandoval ◽  
Edson José Soares ◽  
Fabricio Thomaz
Keyword(s):  
Drag Reduction ◽  
Polymer Mixtures ◽  
Pipe Flows

An experimental study of the drag reduction pipe flows with the addition of natural macromolecules

2019 ◽  
Vol 2019 (0) ◽  
pp. OS10-13
Author(s):  
Shinichirou YANASE ◽  
Eisuke YAMANE ◽  
Toshinori KOUCHI ◽  
Yasunori NAGATA ◽  
Kazunori YASUDA
Keyword(s):  
Experimental Study ◽  
Drag Reduction ◽  
Pipe Flows

DRAG REDUCTION BY A MIXTURE OF POLYMERS AND FIBERS EXTRACTED FROM OKRA PODS IN TURBULENT PIPE FLOWS

2016 ◽  
Author(s):  
Eduardo Coelho ◽  
Kelvin Barbosa ◽  
Edson Soares ◽  
Renato Siqueira
Keyword(s):  
Drag Reduction ◽  
Pipe Flows

CFD Modelling of Drag Reduction Effects in Pipe Flows

2003 ◽  
Author(s):  
Jukka Koskinen ◽  
Mikko Manninen ◽  
Timo Pattikangas ◽  
Villo Alopaeus ◽  
Kari I. Keskinen ◽  
...  
Keyword(s):  
Drag Reduction ◽  
Cfd Modelling ◽  
Pipe Flows

Simulating drag reduction phenomenon in turbulent pipe flows

2008 ◽  
Vol 35 (8) ◽  
pp. 609-613 ◽  
Author(s):  
M. Allahdadi Mehrabadi ◽  
K. Sadeghy
Keyword(s):  
Drag Reduction ◽  
Pipe Flows

Degradation effects of dilute polymer solutions on turbulent drag reduction in pipe flows

1995 ◽  
Vol 55 (1) ◽  
pp. 63-82 ◽  
Author(s):  
J. M. J. Toonder ◽  
A. A. Draad ◽  
G. D. C. Kuiken ◽  
F. T. M. Nieuwstadt
Keyword(s):  
Drag Reduction ◽  
Polymer Solutions ◽  
Turbulent Drag Reduction ◽  
Pipe Flows ◽  
Dilute Polymer Solutions ◽  
Turbulent Drag

A Turbulent Energy Model for Flows With Drag Reduction

1975 ◽  
Vol 97 (2) ◽  
pp. 234-241 ◽  
Author(s):  
S. Hassid ◽  
M. Poreh
Keyword(s):  
Drag Reduction ◽  
Turbulent Energy ◽  
Energy Model ◽  
Linear Polymers ◽  
Mean Velocity ◽  
Pipe Flows ◽  
Newtonian Flows ◽  
Damping Parameter ◽  
Variable Damping ◽  
Good Agreement

A simple turbulent energy model, based on an improved version of Wolfshtein’s model for Newtonian flows, with a variable damping parameter, is used to describe the effect of linear polymers on the velocity profile and the turbulent energy distribution in channel and pipe flows. Measured mean velocity profiles seem to be in good agreement with the model, which predicts as well the observed increase in turbulent energy near the wall in flows with drag reduction.

A tracer dispersion study of the drag-reduction effect in a turbulent pipe flow

1971 ◽  
Vol 47 (2) ◽  
pp. 209-230 ◽  
Author(s):  
A. W. Bryson ◽  
Vr. Arunachalam ◽  
G. D. Fulford
Keyword(s):  
Molecular Weight ◽  
Drag Reduction ◽  
Pipe Flow ◽  
Viscous Sublayer ◽  
Turbulent Pipe Flow ◽  
Reduction Mechanism ◽  
Response Curves ◽  
Pipe Flows ◽  
Tracer Dispersion ◽  
Reduction Effect

Remarkable differences in dispersion of a tracer material injected into turbulent pipe flows of water and water containing as little as 2·5 parts per million by weight of a soluble high-molecular-weight drag-reducing polyoxyethylene additive have been measured. Analysis of the tracer response curves in terms of a simple one-parameter model shows that the observed results are compatible with a drag-reduction mechanism based on thickening of the viscous sublayer adjoining the wall. Other experiments, reported briefly, suggest that polymer adsorption on to the wall is responsible for this thickening.

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