Method for reducing dissipation rate of fluid ejected into boundary layer
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United States of America Patent
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Feb 26, 2002
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N/A
app pub date -
Oct 30, 2000
filing date -
Dec 31, 1998
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Abstract
Skin friction reduction on a surface moving relative to a fluid can be obtained by ejecting a polymer--water mixture/solution into the boundary layer. The efficacy of the ejected polymer--water mixture/solution is closely related to polymer dissipation out of the boundary layer and conditioning (i..e, lengthening, unwinding or stretching) of the polymer molecules by liquid shear forces immediately before ejection. The invention is a method for conditioning and ejecting a polymer--water mixture/solution that improves drag reduction characteristics of the mixture/solution and maintains the mixture/solution in the boundary layer for as long as possible. By improving the drag-reduction characteristics of the drag reducing substance mixture/solution and by extending the time it remains in the near-wall region, the ejector can increase the performance and reduce the volume and storage requirements of a drag-reduction system. The drag reducing substance may be formed of a mixture/aqueous solution of high molecular weight polymer, surfactant, gas microbubbles, or any combination thereof.
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