Polymer/riblet combination for hydrodynamic skin friction reduct

Details Polymer/riblet combination for hydrodynamic skin friction reduct Polymer/riblet combination for hydrodynamic skin friction reduct

1992-05-28

1995-08-29

Swinehart, Edwin L.

Ships

Building

Antifriction surfaces

244130, B64C 138

Patent

active

054450950

ABSTRACT:
A process for reducing skin friction and inhibiting the effects of liquid turbulence in a system involving the flow of a liquid along the surface of a body, e.g. a marine vehicle, includes injecting a drag reducing polymer into the valleys of adjacent, evenly spaced, longitudinal grooves extending along the length of the surface of the body, so that the rate of diffusion of the polymer from individual grooves into the liquid flow is predictably controlled by the groove dimensions. When the polymer has diffused over the tips of the grooves into the near wall region of the boundary layer, the polymer effectively reduces the turbulent skin friction. A substantial drag reducing effect is achieved with less polymer than must be used to lower skin friction when the surface of the body is smooth.

REFERENCES:
patent: 3016865 (1962-01-01), Eichenberger
patent: 3732839 (1973-05-01), Schuster et al.
patent: 4650138 (1987-03-01), Grose
patent: 4753401 (1988-06-01), Bechert
patent: 4932612 (1990-06-01), Blackwelder et al.

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