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Turbulence measurements of drag reducing surfactant systems

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Abstract

LDA measurements were made of mean velocity and of turbulence intensity in a 39.4mm diameter tube, the first measurements in three directions on drag reducing surfactant solutions (0.05% and 0.1% Habon G). Drag reduction exceeded the predictions of the Virk maximum drag reduction asymptote and elastic sublayer mean velocity profiles are steeper than the profile proposed by Virk for maximum drag reducing asymptote solutions. Axial turbulence intensities for Habon G solutions are higher than those for water near the wall, lower in most of the outer region and about the same at the center. Tangential and radial turbulence intensities are lower than those for water.

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Abbreviations

D :

tube diameter

f :

friction factor

\(\frac{{\Delta P}}{l}\) :

pressure gradient

Re :

Reynolds number

r :

distance from tube center

R :

tube radius

u′ z , u′ r and u′ ϕ :

fluctuating velocity in the axial, radial and tangential directions

u z :

mean local axial velocity

u max :

mean velocity at tube center

ū :

bulk mean velocity

u + :

dimensionless velocity

u * :

friction velocity

x :

distance from the wall

y + :

dimensionless distance from the wall

ϱ :

density

δ :

thickness of wall layer

η :

viscosity

τ w :

wall shear stress

subscript s :

refers to surfactant solution flow

subscript w :

refers to water flow

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Authors and Affiliations

  1. Institute of Hydrodynamics, 166-12 Praha, 6, Czech Republic

    Zdenek Chara, Miroslav Severa & Jiri Myska

  2. Department of Chemical Engineering, Ohio State University, 43210, Columbus, Ohio, USA

    Jacques L. Zakin

Authors
  1. Zdenek Chara
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  2. Jacques L. Zakin
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  3. Miroslav Severa
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  4. Jiri Myska
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Chara, Z., Zakin, J.L., Severa, M. et al. Turbulence measurements of drag reducing surfactant systems. Experiments in Fluids 16, 36–41 (1993). https://doi.org/10.1007/BF00188503

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  • DOI: https://doi.org/10.1007/BF00188503

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