K-1221 PIV Measurement of a Drag Reducing Polymer Solution Flow

2001 ◽  
Vol II.01.1 (0) ◽  
pp. 105-106
Author(s):  
Fumihiko Mikami ◽  
Atsushi Sasada ◽  
Nobuhide Nishikawa
Keyword(s):  
Polymer Solution ◽  
Solution Flow ◽  
Piv Measurement ◽  
Drag Reducing Polymer

Concentration dependent changes of apparent slip in polymer solution flow

1990 ◽  
Vol 34 (2) ◽  
pp. 223-244 ◽  
Author(s):  
H. Müller‐Mohnssen ◽  
D. Weiss ◽  
A. Tippe
Keyword(s):  
Polymer Solution ◽  
Solution Flow ◽  
Apparent Slip

Velocity measurements made with a laser dopplermeter on the turbulent pipe flow of a dilute polymer solution

1972 ◽  
Vol 51 (4) ◽  
pp. 673-685 ◽  
Author(s):  
M. J. Rudd
Keyword(s):  
Polymer Solution ◽  
Velocity Component ◽  
Pipe Flow ◽  
Viscous Sublayer ◽  
Turbulent Pipe Flow ◽  
Velocity Measurements ◽  
Velocity Fluctuations ◽  
Conventional Models ◽  
Drag Reducing Polymer ◽  
Spanwise Velocity

This paper presents some new measurements which have been made on a drag-reducing polymer solution in pipe flow. A novel type of laser dopplermeter, which has been developed by the author, is briefly described and the measurements which have been obtained are given. These results and their implications are then discussed in terms of conventional models for turbulent flow in a pipe. These suggest that the polymer has very little effect upon the turbulent core of the flow, but thickens and stabilizes the viscous sublayer. The turbulent intensity inside the sublayer is unchanged but, owing to its thickening, the velocity fluctuations just outside are greater. There is not a general suppression of turbulence within the sublayer although well inside the sublayer the spanwise velocity component is found to be reduced.

Drag Reducing Polymer in Helicoidal Flow

1981 ◽  
Vol 103 (4) ◽  
pp. 491-496 ◽  
Author(s):  
J. T. Kuo ◽  
L. S. G. Kovasznay
Keyword(s):  
Drag Reduction ◽  
Polymer Solution ◽  
Ph Value ◽  
Flow Behavior ◽  
Superposition Principle ◽  
Polymer Concentration ◽  
Second Phase ◽  
Additional Parameter ◽  
Solution Flow ◽  
Screw Pump

A novel flow configuration was explored for the study of the behavior of drag reducing polymers. A screw pump consisting of a smooth cylinder and a concentrically placed screw was used to create a strongly three-dimensional but essentially laminar flow. In the first phase of the study, the static pressure head developed by the screw pump was measured as a function of polymer concentration (polyox 10 to 100 ppm in water). A large increase of the developed head was observed that behaved in an analogous manner to drag reduction as far as concentration and straining of the polymer solution was concerned. In the second phase of the study, a new apparatus was constructed and the additional parameter of a superimposed through flow was included and the degree of failure of the superposition principle was established. Sensitivity of the phenomenon to chemicals like HCl, HNO3, and NaOH in the polymer solution was also studied. When the effect of these chemicals on the polymer solution flow behavior was presented in terms of the pH value of the polymer solution, it showed a similar trend to those observed in drag reduction.

Power-law polymer solution flow in a converging annular spinneret: Analytical approximation and numerical computation

AIChE Journal ◽  
2011 ◽  
Vol 58 (1) ◽  
pp. 122-131 ◽  
Author(s):  
Kuo-Lun Tung ◽  
Yu-Ling Li ◽  
Che-Chia Hu ◽  
Yu-Shao Chen
Keyword(s):  
Polymer Solution ◽  
Numerical Computation ◽  
Power Law ◽  
Analytical Approximation ◽  
Solution Flow

Experimental Study on Two-Oscillating Grid Turbulence With Polymer Additives

2015 ◽  
Author(s):  
Yue Wang ◽  
Wei-Hua Cai ◽  
Tong-Zhou Wei ◽  
Lu Wang ◽  
Feng-Chen Li
Keyword(s):  
Polymer Solution ◽  
Viscous Dissipation ◽  
Newtonian Fluid ◽  
Coherent Structures ◽  
Dissipation Rate ◽  
Close Relation ◽  
Space Distribution ◽  
Polymer Additives ◽  
Grid Turbulence ◽  
Solution Flow

In order to investigate the polymer effect on grid turbulence, the experiments study on grid turbulence has been built based on Particle Image Velocimetry. The Newtonian fluid flow and 200ppm polymer solution flow in grid turbulence were carried out at different grid oscillating frequency, such as 5Hz, 7.5Hz, 10Hz and 12.5Hz. The experimental results show that the viscous dissipation rate and vortex vector ωz is smaller and more regular in space distribution in polymer solution case at grid oscillating frequency with 5Hz. It indicates that the existence of polymer additives inhibits enormously the viscous dissipation rate and vortex vector, but this phenomenon can be attenuated with the increase of grid oscillating frequency. From this result, it shows that there exists a critical Reynolds number for the inhibition of polymer effect, which is the same as that in turbulent channel flows with polymers. Then, proper orthogonal decomposition (POD) has been used to extract coherent structures in grid turbulence. It is found that it needs 24 and 4 POD eigenfunctions to examine coherent structure in the Newtonian fluid and the polymer solution cases respectively at grid oscillating frequency with 10Hz. It suggests that the coherent structures can be inhibited due to the existence of polymers so as to the flow field to be more regular. But, with the increase of grid oscillating frequency, the number of POD eigenfunctions for the Newtonian fluid case and the polymer solution case respectively are approaching the same. Through this analysis, it can be also seen that the inhibition effect of polymers is close relation with the grid oscillating frequency.

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