The influence of a drag reducing polymer additive in water
on radiated flow noise was experimentally determined. The test
facility was a rotating cylinder mounted in the center of a large
cylindrical tank which served as an echoic chamber for the sound
power measurements. Sound power radiated from the boundary layer
of the rotating cylinder was measured for concentrations of 0, 10,
100, and 1000 ppmw of Polyox WSR 301 dissolved in the water. Sound
power reductions greater than 20 decibels were noted in a frequency
range of 20 to 100 kHz for a concentration of 1000 ppmw. Little
influence could be found in a frequency range of 1 to 20 kHz.
The effect of polymer additive on the drag coefficient of
a rotating cylinder is also shown.
Killen, John M.; Crist, Scott D..
The Effect of Dilute Solutions of Drag Reducing Polymers on Radiated Flow Noise.
St. Anthony Falls Laboratory.
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