A study with particle-image velocimetry of the influence of drag-reducing polymers on the structure of turbulence

Warholic, M. D.; Heist, David; Katcher, Micah; Hanratty, Thomas J.

doi:10.1007/s003480100288

Cited by 116 publications

(109 citation statements)

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“…͑2.23͒. In this study, the experimental data collected by Warholic et al, 24,39 Harder and Tiederman, 20 and Ptasinski et al 40,41 will be used for the verification shown in Fig. 1.…”

Section: ͑226͒mentioning

confidence: 99%

“…Warholic et al 24 used a PIV system to experimentally investigate the effect of drag-reducing polymers on the structure of turbulence in a channel flow, under conditions of 43% and 55% DR. A solution of a copolymer of polyacrylamide and sodium acrylate ͑Percol 727͒ was injected through wall slots at the entrance to the channel, the polymer concentrations were 1.24 and 50 ppm, and the estimated D * were 1.7 and 1.95, respectively.…”

Section: ͑226͒mentioning

confidence: 99%

“…2͑a͒, the agreement between Eq. ͑2.24͒ and the measured fluctuating velocity in Newtonian fluid flow is investigated, and it includes the data from Warholic et al, 24,39 Harder and Tiederman, 20 and Hishida et al 45 It can be seen that like the mean velocity distributions discussed above, different experimenters obtained different profiles of fluctuating velocity, but all measured profiles can be roughly represented by Eq. ͑2.24͒, suggesting that Eq.…”

Section: -5mentioning

confidence: 99%

“…Warholic et al 24 applied PIV to a channel flow with polymer additives, and they found that the role of the wall in creating turbulence greatly diminishes at large drag reductions ͑LDRs͒. White et al 25 used PIV in a drag-reducing flat-plate boundary layer flow and found that a significant modification of the near-wall structure of turbulence with a coarsening of the low-speed velocity streaks and a reduction in the number and strength of near-wall vertical structures.…”

Section: Introductionmentioning

confidence: 99%

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Modeling of viscoelastic turbulent flow in channel and pipe

Yang

Dou

2008

Physics of Fluids

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This paper investigates turbulent flows with or without polymer additives in open channels and pipes. Equations of mean velocity, root mean square of velocity fluctuations, and energy spectrum are derived, in which the shear stress deficit model is used and the non-Newtonian properties are represented by the viscoelasticity ␣ * . The obtained results show that, with ␣ * increment, ͑1͒ the streamwise velocity fluctuations is increased, ͑2͒ the wall-normal velocity fluctuation is attenuated, ͑3͒ the Reynolds stress is reduced, and ͑4͒ there is a redistribution of energy from high frequencies to the low frequencies for the streamwise component, but dimensionless distribution over all frequencies almost remains the same as that in Newtonian fluid flows. Good agreement between the derived equations and experimental data in small drag-reduction regime is achieved, which indicates that the present model is workable for Newtonian/non-Newtonian fluid turbulent flows.

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“…͑2.23͒. In this study, the experimental data collected by Warholic et al, 24,39 Harder and Tiederman, 20 and Ptasinski et al 40,41 will be used for the verification shown in Fig. 1.…”

Section: ͑226͒mentioning

confidence: 99%

Section: ͑226͒mentioning

confidence: 99%

Section: -5mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Modeling of viscoelastic turbulent flow in channel and pipe

Yang

Dou

2008

Physics of Fluids

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“…Recent experimental results (Warholic et al 1999(Warholic et al , 2001) reveal that in the maximum drag reduction region the ejections from the wall are eliminated and the near-wall vortices that sustain turbulence in a Newtonian fluid are completely destroyed. Low-speed streamwise velocity streaks are essentially absent.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear travelling waves as a framework for understanding turbulent drag reduction

Li¹,

Li²,

Graham³

2006

J. Fluid Mech.

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Nonlinear traveling waves that are precursors to laminar-turbulent transition and capture the main structures of the turbulent buffer layer have recently been found to exist in all the canonical parallel flow geometries. We study the effect of polymer additives on these "exact coherent states" (ECS), in the plane Poiseuille geometry. Many key aspects of the turbulent drag reduction phenomenon are found, including: delay in transition to turbulence; drag reduction onset threshold; diameter and concentration effects. Furthermore, examination of the ECS existence region leads to a distinct prediction, consistent with experiments, regarding the nature of the maximum drag reduction regime. Specifically, at sufficiently high wall shear rates, viscoelasticity is found to completely suppress the normal (i.e. streamwise-vortex-dominated) dynamics of the near wall region, indicating that the maximum drag reduction regime is dominated by a distinct class of flow structures.

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Turbulence Structures in Drag-Reducing Surfactant Solution Flow

Wei

et al. 2012

Turbulent Drag Reduction by Surfactant Additives

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A study with particle-image velocimetry of the influence of drag-reducing polymers on the structure of turbulence

Cited by 116 publications

References 0 publications

Modeling of viscoelastic turbulent flow in channel and pipe

Modeling of viscoelastic turbulent flow in channel and pipe

Nonlinear travelling waves as a framework for understanding turbulent drag reduction

Turbulence Structures in Drag-Reducing Surfactant Solution Flow

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