Resistance of a plane plate in a turbulent flow of weak polymer solution

1979 ◽  
Vol 36 (1) ◽  
pp. 4-8
Author(s):  
Yu. F. Ivanyuta ◽  
L. A. Chekalova
Keyword(s):  
Turbulent Flow ◽  
Polymer Solution ◽  
Plane Plate

Heterogeneous Drag Reduction Concepts and Consequences

1998 ◽  
Vol 120 (4) ◽  
pp. 818-823 ◽  
Author(s):  
Klaus W. Hoyer ◽  
Albert Gyr
Keyword(s):  
Flow Field ◽  
Turbulent Flow ◽  
Drag Reduction ◽  
Polymer Solution ◽  
Large Scale ◽  
Scale Interaction ◽  
Polymer Molecules ◽  
Pipe Flows ◽  
Heterogeneous Drag Reduction ◽  
Turbulent Flow Field

This paper deals with the nature of the heterogeneous drag reduction which occurs in turbulent pipe flows when a concentrated polymer solution is injected into the pipe center. According to earlier concepts, the achieved drag reduction is due to a direct, large-scale interaction of the viscoelastic polymer thread with the turbulent flow field. The authors prove that the heterogeneous drag reduction originates exclusively from agglomerates of dissolved polymer molecules present in the flow.

The Reduced Drag of Polymer Solutions in Turbulent and Transient Laminar Shear Flows

1973 ◽  
Vol 95 (1) ◽  
pp. 23-28 ◽  
Author(s):  
R. J. Hansen
Keyword(s):  
Turbulent Flow ◽  
Polymer Solution ◽  
Constant Velocity ◽  
Random Function ◽  
Polymer Solutions ◽  
Unusual Behavior ◽  
Infinite Extent ◽  
The Mean ◽  
Flow Drag ◽  
Laminar Shear

The laminar flow of a polymer solution near a flat plate of infinite extent is investigated theoretically for three cases: (a) the plate is impulsively started and moves in its own plane with a constant velocity; (b) it executes linear harmonic oscillations in its own plane; (c) its motion in this plane is a random function of time. In each case the mean square value of the drag exerted on the plate by the polymer solution is predicted to be less than that by a Newtonian fluid of the same viscosity and density. The results are combined with a simple model for the turbulent boundary layer, and a number of experimentally observed characteristics of the turbulent flow drag reduction phenomenon are predicted. The merits of this transient shear explanation for the unusual behavior of polymer solutions in turbulent flow are compared to those of previously offered hypotheses.

Vortex deformation and turbulent energy of polymer solution in a two-dimensional turbulent flow

2020 ◽  
Vol 285 ◽  
pp. 104385
Author(s):  
Ruri Hidema ◽  
Kengo Fukushima ◽  
Ryohei Yoshida ◽  
Hiroshi Suzuki
Keyword(s):  
Turbulent Flow ◽  
Polymer Solution ◽  
Turbulent Energy ◽  
Two Dimensional

Drag of a plane plate in a stream of a polymer solution having variable concentration

1975 ◽  
Vol 9 (1) ◽  
pp. 47-51 ◽  
Author(s):  
V. A. Ioselevich ◽  
V. N. Pilipenko
Keyword(s):  
Polymer Solution ◽  
Variable Concentration ◽  
Plane Plate
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