The flow of a dilute cationic surfactant solution past a circular cylinder

2001 ◽  
Vol 30 (4) ◽  
pp. 410-417 ◽  
Author(s):  
C. Bergins ◽  
M. Nowak ◽  
M. Urban
Keyword(s):  
Circular Cylinder ◽  
Cationic Surfactant ◽  
Surfactant Solution

Drag Reduction of the Flow Past a Circular Cylinder in Surfactant Solution

2001 ◽  
Author(s):  
Satoshi Ogata ◽  
Keizo Watanabe
Keyword(s):  
Circular Cylinder ◽  
Drag Reduction ◽  
Sodium Salicylate ◽  
Tap Water ◽  
Pressure Coefficient ◽  
Surfactant Solution ◽  
Reduction Ratio ◽  
Number Range ◽  
Surfactant Solutions ◽  
Maximum Drag Reduction

Abstract The flow around a circular cylinder in surfactant solution was investigated experimentally by measurement of the pressure and velocity profiles in the Reynolds number range 6000 < Re < 50000. The test surfactant solutions were aqueous solutions of Ethoquad O/12 (Lion Co.) at concentrations of 50, 100 and 200 ppm, and sodium salicylate was added as a counterion. It was clarified that the pressure coefficient of surfactant solutions in the range of 10000 < Re < 50000 at the behind of the separation point was larger than that of tap water, and the separation angle increased with concentration of the surfactant solution. The velocity defect in surfactant solutions behind a circular cylinder was smaller than those in tap water. The drag coefficients of a circular cylinder in surfactant solutions were smaller than those of tap water in the range 10000 < Re < 50000, and no drag reduction occurred at Re = 6000. The drag reduction ratio increased with increasing concentration of surfactant solution. The maximum drag reduction ratio was approximately 35%.

Surfactant Effects on Picloram Adsorption by Soils

Weed Science ◽  
1976 ◽  
Vol 24 (6) ◽  
pp. 549-552 ◽  
Author(s):  
J. D. Gaynor ◽  
V. V. Volk
Keyword(s):  
Organic Matter ◽  
Cationic Surfactant ◽  
Anionic Surfactant ◽  
Organic Matter Content ◽  
Clay Content ◽  
Surfactant Solution ◽  
Matter Content ◽  
Adsorption Sites ◽  
Surfactant Solutions ◽  
Extractable Al

The effects of soil organic matter, clay, extractable Al, cation exchange capacity, and pH on the adsorption of picloram (4-amino-3,5,6-trichloropicolinic acid) from aqueous and surfactant solutions were investigated. Linear adsorption isotherms for the soils were obtained with the Freundlich equation. Of the five soil properties investigated, Freundlich K values correlated with extractable Al and clay content. Picloram adsorption from aqueous solutions and from the non-ionic and anionic surfactant solutions was greater on the soils at pH 5 than at pH 7. The anionic surfactant competed with picloram for adsorption sites on the soils at pH 5. Picloram adsorption from solutions containing 0.1 and 1% cationic surfactant was greater than that from aqeuous and anionic and nonionic surfactant solutions. Picloram adsorption from the 10% cationic surfactant solution was similar on soils with pH 5 and 7 and increased with decreased organic matter content.

K-1216 Drag reduction of a circular cylinder in surfactant solution

2001 ◽  
Vol II.01.1 (0) ◽  
pp. 95-96
Author(s):  
Satoshi OGATA ◽  
Keizo WATANABE ◽  
Shinobu MATSUDA
Keyword(s):  
Circular Cylinder ◽  
Drag Reduction ◽  
Surfactant Solution

scholarly journals Adsorption Mechanism of a Cationic Surfactant on Textiles in Excess Anionic Surfactant Solution

1987 ◽  
Vol 36 (1) ◽  
pp. 38-41
Author(s):  
Osamu OKUMURA ◽  
Hirofumi KANAO ◽  
Shigeru YANABA ◽  
Kentaro KIYAMA
Keyword(s):  
Cationic Surfactant ◽  
Anionic Surfactant ◽  
Adsorption Mechanism ◽  
Surfactant Solution
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