Deformation of a viscoelastic coating under the action of convective pressure fluctuations

Kulik, V. M.; Rodyakin, S. V.; Lee, Inwon; Chun, Ho Hwan

doi:10.1007/s00348-005-0947-y

Cited by 19 publications

(16 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This requirement contradicts the condition of large interaction between coating and flow. Kulik et al 6 made an estimation of deformation parameters for a "hard" compliant coating with the modulus of elasticity greater than 1 MPa. It was estimated that the displacement of the coating surface is essentially less than the thickness of the viscous sublayer.…”

Section: Introductionmentioning

confidence: 99%

Wave properties of coating for skin friction reduction

Kulik

Lee

2008

Physics of Fluids

Self Cite

View full text Add to dashboard Cite

Toward the understanding of the drag reduction mechanism, theoretical as well as experimental investigations have been made of the wave properties of compliant coatings such as the wave velocity and the decay parameters. The compliant coating consisted of a homogeneous layer of viscoelastic material attached to a rigid substrate. Based on two-dimensional elastic wave analysis, wave properties such as the dispersion of wave velocity, the ratio between the amplitudes of two wave components, and decay characteristics have been calculated as a function of Poisson's ratio and the loss tangent . It was found that the wave parameters are strongly affected by Poisson's ratio . A new experimental technique is devised for direct measurement of the wave parameters of the coating. The wave velocity and the rate of decay were measured based on the amplitude and phase of coating deformation with varying distances from the excitation point. Two kinds of silicon rubber were tested in the frequency range from 500 to 1200 Hz. Comparison of the present two-dimensional model with the conventional local deformation model was made. Two conditions ͑time factor and space factor͒ for drag reduction were drawn to maximize the interaction between the coating and the turbulent flow. These conditions suggest a certain optimum region in the coordinates of the flow velocity and the coating thickness.

show abstract

Section: Introductionmentioning

confidence: 99%

Wave properties of coating for skin friction reduction

Kulik

Lee

2008

Physics of Fluids

Self Cite

View full text Add to dashboard Cite

show abstract

“…The proposed method of optimizing the characteristics of the coating is based on the analyses of both its response to an external forcing (Duncan et al 1985;Kulik et al 2005a;Kulik et al 2005b;Kulik et al 2008) and the generation of turbulence at the compliant surface (Semenov 1996;Semenov 2009) and requires that the interaction between the flow and the coating is maximum. the resonant frequency of the coating is in a certain frequency range.…”

Section: Prediction Of Drag Reductionmentioning

confidence: 99%

“…However, in the frequency range of the coating and flow interaction (in the vicinity of the resonant frequency of the coating) the speed of its movement may be comparable with the turbulent velocity fluctuations near the wall (Kulik et al 2005a;Kulik et al 2005b).…”

Section: Prediction Of Drag Reductionmentioning

confidence: 99%

“…On the other hand, Kulik et al (2005a) concluded that the coating deformation is maximized when the wavelength of pressure fluctuations convecting with velocity U c is equal to the wavelength of surface. Hence, a drag reduction would be expected when an optimal interaction of the coating with the flow occurs with the following conditions temporal factor : coincidence of the resonant frequencies in Eq.…”

Section: Prediction Of Drag Reductionmentioning

confidence: 99%

See 1 more Smart Citation

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

Бойко¹,

Kulik²,

Hu³

et al. 2011

International Journal of Naval Architecture and Ocean Engineeri

Self Cite

View full text Add to dashboard Cite

show abstract

“…Viscoelastic properties of polymeric materials are required in various scientific and engineering applications such as polymer science [1,2], attenuation of sound and vibration [3] and skin friction reduction using compliant coating [4]. For relatively slow processes with characteristic frequencies less than 1 Hz, the materials are characterized usually in terms of relaxation time, which describes a transient response to the excitations on the sample.…”

Section: Introductionmentioning

confidence: 99%

Numerical estimation of dynamic behavior of viscoelastic elastomer specimen

et al. 2008

Self Cite

View full text Add to dashboard Cite

Dynamic deformation behavior of a cylindrical specimen made of viscoelastic elastomers was investigated numerically by solving the two-dimensional elastic wave equations. In order to enhance the accuracy of the viscoelastic property calculations, a pseudospectral analysis of two-dimensional elastic wave equation was employed. This allowed us to exclude the use of the form factor derived from the conventional one-dimensional model. Using the present method, an assessment of the conventional form factor concept was attempted. The present two-dimensional method was then utilized to predict a forced vibration response of the elastomer samples under periodic excitation. Obtained numerical results were compared with those using the simplest one-dimensional model. Applicable range of the form factor was examined. Empirical formulas to correct static and dynamic form factors for elastic deformation mode, which are suitable for engineering applications, are suggested.

show abstract

Deformation of a viscoelastic coating under the action of convective pressure fluctuations

Cited by 19 publications

References 6 publications

Wave properties of coating for skin friction reduction

Wave properties of coating for skin friction reduction

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

Numerical estimation of dynamic behavior of viscoelastic elastomer specimen

Contact Info

Product

Resources

About