Experiments on the effects of aging on compliant coating drag reduction

Bandyopadhyay, Promode R.; Henoch, Charles; Hrubes, J. Dana; Semenov, B. N.; Amirov, A. I.; Kulik, V. M.; Malyuga, A. G.; Choi, Kwing-So; Escudier, M. P.

doi:10.1063/1.2008997

Cited by 32 publications

(12 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…31 First, selected an approximate linear scatter near the yield point from the tensile strength test. Second, calculated stress (d) and strain (e) according to equations (2) and (3) using these scatter points. Third, plotted strainstress scatter diagrams and performed linear fitting.…”

Section: Tensile Testmentioning

confidence: 99%

“…Most of the researches have focused on the mechanism of skin elasticity [1][2][3][4] and special skin structure 5,6 to control the fluid medium. Some research also indicates that boundary heating mechanism by the dolphin's skin reduces the viscosity of the fluid, which leads to drag reduction, because there is a 9°C difference in temperature between the dolphin's skin and the boundary layer fluid when a dolphin is swimming at high speed.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Aluminum nitride–filled elastic silicone rubber composites for drag reduction

Tian

Wang

Jin

et al. 2017

Advances in Mechanical Engineering

View full text Add to dashboard Cite

This study presents aluminum nitride/silicone rubber composite as a drag reduction material, inspired by the boundary heating drag reduction mechanism of dolphin skin. Aluminum nitride was added as a thermal conductive filler at weight fractions of 16.67, 21.05, and 28.57 wt% to pristine silicone rubber. Tests of the thermal conductivity and tensile properties showed that the thermal conductivity of all three aluminum nitride/silicone rubber composites were increased 27.9%, 41.4%, and 43.7% than that of the pristine silicone rubber, and the elastic modulus of the composites was increased with the aluminum nitride content. Droplet velocity testing, which can reflect the drag reduction mechanism of the heating boundary controlled by the aluminum nitride/silicone rubber composites, was performed between all three aluminum nitride/silicone rubber composites and pristine silicone rubber. The results showed that the droplet velocity of all three aluminum nitride/silicone rubber composites were higher than pristine silicone rubber, implying that the composites had a drag-reducing function. In terms of the drag-reducing mechanism, the heat conductivity performance of the aluminum nitride/silicone rubber accelerates the heat transfer between the aluminum nitride/silicone rubber composite surface and droplet. The forces between the molecules and droplet dynamic viscosity are reduced, which result in drag reduction. The application of aluminum nitride/silicone rubber composite to control fluid medium will have important value for fluid machinery.

show abstract

Section: Tensile Testmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Aluminum nitride–filled elastic silicone rubber composites for drag reduction

Tian

Wang

Jin

et al. 2017

Advances in Mechanical Engineering

View full text Add to dashboard Cite

show abstract

“…The slip of a liquid on a solid wall occurs in many engineering situations such as lubrication [1], the flow on porous media [2], coating [3] and particle aggregation [4] and so on. Recently, its use to reduce the frictional drag has drawn attention in the miniaturized devices in which the critical dimension reaches to micro and nano scale [5].…”

Section: Introductionmentioning

confidence: 99%

Frictional drag reduction in microchannel using slip on convex air bubbles naturally formed in a specifed a cavity

Kwon

Kim

Park

et al. 2011

2011 16th International Solid-State Sensors, Actuators and Microsystems Conference

View full text Add to dashboard Cite

This paper presents the reduction of frictional drag by using the slip on the interface of convex air bubble. The visualization shows that the convex bubbles formed naturally in the hydrophobic cavity array positioned along a microchannel with time. The size of the bubbles depended on the size of the cavity size. The velocity distribution was also displayed by using a micro-PIV measurement. Then, the volume flow rate and the momentum were examined by increasing inlet flow rate for the different sizes of microbubble. The maximum reduction of frictional drag of 52 % was obtained.

show abstract

“…The dynamic properties of these materials such as modulus of elasticity and loss tangent as functions of frequency are of primary importance in designing such devices. In addition, it has been recently reported that information on the dynamic properties is crucial in optimizing design parameters of the compliant coating for the reduction of turbulent flow skin friction [3].…”

Section: Introductionmentioning

confidence: 99%

Measurement of Dynamic Properties of Viscoelastic Materials

et al. 2008

Self Cite

View full text Add to dashboard Cite

An improved method to measure the dynamic viscoelastic properties of elastomers is proposed. The method is based on the analysis of forced oscillation of a cylindrical sample loaded with an inertial mass. No special equipment or instrumentation other than the ordinary vibration measurement apparatus is required. Upper and lower surfaces of the viscoelastic material sample were bonded to a load disc and a rigid base plate, respectively. The rigid base plate was subject to forced oscillations driven by a vibration exciter. Two accelerometers were attached to monitor the displacement of the base plate and the load disc. The recorded magnitude ratio and the phase difference between the load disc and the base plate vibrations represent the axial, dynamic deformation of the sample. The data are sufficient to obtain the dynamic properties of the sample, oscillation properties of vibration exciter, whereas the sensitivity of gauges having no effect on the calculation results. For accurate calculation of the properties, a two-dimensional numerical model of cylindrical sample deformation was used. Therefore, a form factor, which takes into account the sample sizes in one-dimensional models, is not required in this method. Typical measurement of the viscoelastic properties of a silicone rubber Silastic® S2 were measured over the frequency range from 10 Hz to 3 kHz under deformations (ratio of vibration magnitude to sample thickness) from 10 −4 % to 5%. It was shown that the modulus of elasticity and the loss tangent fall on a single curve when the ratio of load mass to sample mass changed from 1 to 20. When the sample diameter was varied from 8 to 40 mm, the modulus of elasticity fall on the same curve, but the loss tangent curves showed some degree of scatter. Studied temperature dependence and nonlinear behavior of viscoelastic properties is found not to be associated with this effect.

show abstract

Experiments on the effects of aging on compliant coating drag reduction

Cited by 32 publications

References 20 publications

Aluminum nitride–filled elastic silicone rubber composites for drag reduction

Aluminum nitride–filled elastic silicone rubber composites for drag reduction

Frictional drag reduction in microchannel using slip on convex air bubbles naturally formed in a specifed a cavity

Measurement of Dynamic Properties of Viscoelastic Materials

Contact Info

Product

Resources

About