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Viscous Drag Reduction Using Hydrophobic Surface

Award Information
Agency: Department of Defense
Branch: Navy
Contract: N00014-06-M-0193
Agency Tracking Number: N064-024-0034
Amount: $96,437.00
Phase: Phase I
Program: STTR
Solicitation Topic Code: N06-T024
Solicitation Number: N/A
Solicitation Year: 2006
Award Year: 2006
Award Start Date (Proposal Award Date): 2006-08-01
Award End Date (Contract End Date): 2007-05-31
Small Business Information
3252 Holiday Court Suite 115
La Jolla, CA 92037
United States
DUNS: 969813278
HUBZone Owned: No
Woman Owned: No
Socially and Economically Disadvantaged: No
Principal Investigator
 Sheldon Schultz
 (858) 638-0315
Business Contact
 David Schultz
Title: Vice-President
Phone: (858) 638-0315
Research Institution
 Kenny Breuer
184 Hope St
Providence, RI 02912
United States

 (401) 863-2870
 Nonprofit College or University

It has been shown that hydrophobic surfaces can reduce skin-friction drag in micro-fluidic devices. During Phase I research, we will fabricate and test a high performance durable hydrophobic surface coating created by a simple, cost-effective, and environmentally friendly method. This coating could have significant effects on skin-friction drag reduction and/or transition delay in boundary layers. This surface modification on Navy vessels and underwater munitions would enable significantly reduced cost of operation and increased performance. We will estimate and characterize the required properties, such as the slip length, of the hydrophobic surfaces in these preliminary analyses and demonstrate the desired effect using numerical simulations and small-scale laboratory experiments. Based on the coatings fabrication design developed in Phase I, during Phase II we will fabricate a hydrophobic surface large enough to cover a substantial part of the model vessel (surface ships or submersibles) and directly test drag reduction in tow tank and/or water-tunnel experiments.BENEFITS: The major goal of this research plan is to develop hydrophobic surface coatings that reduce the transition to turbulence, turbulent skin friction and turbulent pressure fluctuations that occur at the ship-water interface during motion. These coatings would be widely applicable for use on surface ships, underwater transport vehicles and munitions and have considerable benefit by increasing vehicular performance. Reduction of the turbulent skin friction would enable increases in overall top speeds as well as enhancing effective range. The ability to delay the onset of transition to turbulence would also have similar effects by reducing the total vehicle drag. Reduction of turbulent skin friction would have major economic implications, particularly for cargo transport. Drag reduction would result in significantly reduced fuel consumption, thus leading to lower shipping costs, and providing tremendous benefit both to military and commercial water transport systems.

* Information listed above is at the time of submission. *

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