Apparatus to reduce skin friction drag on a marine vessel
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United States of America Patent
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Sep 24, 2013
Grant Date -
Nov 1, 2012
app pub date -
Jun 11, 2012
filing date -
Jan 10, 2008
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Abstract
An apparatus of reducing skin friction drag on a marine hull comprising imparting ultrasonically-induced cavitation at a boundary layer at the hull-water interface. The apparatus includes a sonification plate on at least a portion of a wettable area of the hull to establish a boundary layer interface between the sonification plate and the water medium, and an acoustic generator for energizing the sonification plate to produce microcavitation bubbles at the boundary layer interface whereby to alter the Reynolds number, kinematic viscosity, and coefficient of friction. The sonification plate is hermetically sealed and includes an array of ultrasonic transducers, which may be mounted on an interior or exterior surface of the hull. The energizing nucleates microcavitation bubbles upon entrained gases and/or particulate matter residing in the water medium.
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