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Experiments on the effects of aging on compliant coating drag reduction
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10.1063/1.2008997
/content/aip/journal/pof2/17/8/10.1063/1.2008997
http://aip.metastore.ingenta.com/content/aip/journal/pof2/17/8/10.1063/1.2008997

Figures

Image of FIG. 1.
FIG. 1.

Rate of change in modulus of elasticity due to aging of coating material polydimethylsiloxane. The symbols are derived from the data in Refs. 17 (open triangle and square) and 25 (filled diamond and open circle; see text). The solid line is a proposed aging equation , where is the modulus of elasticity in megapascals and is the age in days.

Image of FIG. 2.
FIG. 2.

Rate of change in loss tangent due to aging of coating material polydimethylsiloxane. The symbols are derived from the data in Refs. 17 (diamond and square) and 25 (open circle and triangle; see text). The solid line shows a proposed aging equation , where is the loss factor and is the age in days.

Image of FIG. 3.
FIG. 3.

Compliant coating water tunnel model. The drag transducer (DVRT) for the floating section was installed later inside the model.

Image of FIG. 4.
FIG. 4.

(Color). The NUWC model with a compliant coating installed in the MIT water tunnel.

Image of FIG. 5.
FIG. 5.

LDV measurements of mean velocity profiles in the boundary layer in wall layer scales in the base line noncoated case in NUWC measurements.

Image of FIG. 6.
FIG. 6.

Coefficient of friction as a function of Reynolds number for all base line data and comparison to Blasius (laminar) (lowest line) and Prandtl–Von Karman (turbulent) (uppermost line) relations (Refs. 27 and 29). The base lines represent uncoated wall measurements between sets of coated measurements.

Image of FIG. 7.
FIG. 7.

NUWC drag transducer (DVRT) calibration in situ. Linearity is maintained for drag values below that for a flow speed of .

Image of FIG. 8.
FIG. 8.

Comparison of friction velocities from mean velocity profiles, just downstream of the floating section, with those from drag measurements over the floating section. The solid line indicates a perfect correlation. Freestream velocities are 2.42, 4.31, and for the three data points shown. Uncertainties are not increasing as the speed is halved and drag becomes one-fourth.

Image of FIG. 9.
FIG. 9.

(Color). Measurements of drag reduction of compliant coatings carried out during after manufacture. The shaded rectangles , the single box indicated by the dashed lines , and the funnel shape enclosed by the chain link show uncertainties in the UK, Russian, and NUWC measurements, respectively.

Image of FIG. 10.
FIG. 10.

(Color). Measurements of drag reduction of compliant coatings carried out during after manufacture. The shaded rectangles , the single box indicated by the dashed lines , and the funnel shape enclosed by the chain link show uncertainties in the UK, Russian, and NUWC measurements, respectively.

Image of FIG. 11.
FIG. 11.

(Color). Measurements of drag reduction of compliant coatings carried out during days after manufacture. The shaded rectangles , the single box indicated by the dashed lines , and the funnel shape enclosed by the chain link show uncertainties in the UK, Russian, and NUWC measurements, respectively.

Tables

Generic image for table
Table I.

Material properties of present compliant coatings. Elasticity and loss tangent are quoted for quasiequilibrium values at . Coating thickness in Russian tests: in materials N2F, N3Ar, and N5.

Generic image for table
Table II.

Boundary layer parameters in the NUWC experiments.

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/content/aip/journal/pof2/17/8/10.1063/1.2008997
2005-08-18
2014-04-23
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Experiments on the effects of aging on compliant coating drag reduction
http://aip.metastore.ingenta.com/content/aip/journal/pof2/17/8/10.1063/1.2008997
10.1063/1.2008997
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