Experimental investigation of one-layer viscoelastic coatings action on turbulent friction and wall pressure pulsations

Kulik, V. M.; Poguda, I. S.; Semenov, B. N.

doi:10.1007/978-94-011-3526-9_14

Cited by 21 publications

(18 citation statements)

References 10 publications

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“…Therefore, the results from these experiments [95][96][97][98] were inconclusive in proving that DR achieved by Kramer [94] is irreproducible. In 1991, Kulik et al [103] used the optimum compliant surfaces produced by Semenov [104] in their experimental work. They reported a successful turbulent DR in a lake and their experimental results were validated by Choi et al [105].…”

Section: Compliant Surfacesmentioning

confidence: 99%

Reviews on drag reducing polymers

Tiong

Perumal

2015

Korean J. Chem. Eng.

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Polymers are effective drag reducers owing to their ability to suppress the formation of turbulent eddies at low concentrations. Existing drag reduction methods can be generally classified into additive and non-additive techniques. The polymer additive based method is categorized under additive techniques. Other drag reducing additives are fibers and surfactants. Non-additive techniques are associated with the applications of different types of surfaces: riblets, dimples, oscillating walls, compliant surfaces and microbubbles. This review focuses on experimental and computational fluid dynamics (CFD) modeling studies on polymer-induced drag reduction in turbulent regimes. Other drag reduction methods are briefly addressed and compared to polymer-induced drag reduction. This paper also reports on the effects of polymer additives on the heat transfer performances in laminar regime. Knowledge gaps and potential research areas are identified. It is envisaged that polymer additives may be a promising solution in addressing the current limitations of nanofluid heat transfer applications.

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Section: Compliant Surfacesmentioning

confidence: 99%

Reviews on drag reducing polymers

Tiong

Perumal

2015

Korean J. Chem. Eng.

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“…The experiments were carried out in the saline lake Issyk-Kool, where 2.1 m-long, 0.175 m-diameter streamline body of revolution was towed by the tow boat with speed U 0 = 6-15 m/s. This model (see Figure 2) was described in details formerly by Kulik et al [16,36]. It was equipped (in the middle of its length) with 0.66 m-long "floating" surface element for measuring the skin-friction drag.…”

Section: Experimental Conditionsmentioning

confidence: 99%

“…Compliant surface reacts on long-wave disturbances. According to the estimation of the interference theory of Semenov [15] and experimental data of Kulik et al [16] the real viscoelastic coating is deformed by the pressure wave with length more than one thousand viscous scales. Viscous scale is ν/υd, where friction velocity is υd=(τw/ρ)0.5, ρ and ν are density and viscosity of flow, and τ w is friction stress on a wall (Hinze [17]).…”

Section: Some Notes On Investigation Outlooksmentioning

confidence: 99%

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The Combination of Polymer, Compliant Wall, and Microbubble Drag Reduction Schemes

Semenov

2011

Advances in Mechanical Engineering

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“…The stiff compliant coating was introduced relatively recently; Kulik et al (1991) reported about 20% drag reduction with a model towed in a natural water basin at velocities 10 -20 m/s. The same coating was subsequently tested in a cavitation tunnel by Choi et al (1997) and found to be result in drag reduction of about 7% at velocities 1~5 m/s.…”

Section: Introductionmentioning

confidence: 99%

Verification of drag-reduction capabilities of stiff compliant coatings in air flow at moderate speeds

Бойко

Kulik

et al. 2011

International Journal of Naval Architecture and Ocean Engineeri

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Skin frictional drag reduction efficiency of "stiff" compliant coating was investigated in a wind tunnel experiment. Flat plate compliant coating inserts were installed in a wind tunnel and the measurements of skin frictional drag and velocity field were carried out. The compliant coatings with varying viscoelastic properties had been prepared using different composition. In order to optimize the coating thickness, the most important design parameter, the dynamic viscoelastic properties had been determined experimentally. The aging of the materials (variation of their properties) during half a year was documented as well. A design procedure proposed by Kulik et al. (2008) was applied to get an optimal value for the coating thickness. Along with the drag measurement using the strain balance, velocity and pressure were measured for different coatings. The compliant coatings with the thickness h = 7mm achieved 4~5% drag reduction within a velocity range 30~40 m/s. The drag reduction mechanism of the attenuation of turbulence velocity fluctuations due to the compliant coating was demonstrated. It is envisioned that larger drag reduction effect is obtainable at higher flow velocities for high speed trains and subsonic aircrafts.

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Experimental investigation of one-layer viscoelastic coatings action on turbulent friction and wall pressure pulsations

Cited by 21 publications

References 10 publications

Reviews on drag reducing polymers

Reviews on drag reducing polymers

The Combination of Polymer, Compliant Wall, and Microbubble Drag Reduction Schemes

Verification of drag-reduction capabilities of stiff compliant coatings in air flow at moderate speeds

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