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The Effect of Micro bubbles and Bulbous Bow on the Aerodynamic Efficiency of a Boat

The Effect of Micro bubbles and Bulbous Bow on the Aerodynamic Efficiency of a Boat. Harry Kucharczyk. Need. $438 Million spent on annual boating fuel (Lipton 95) 99.8% of goods are transported by ships Carbon Dioxide emissions continue to rise. www.unido-ichet.org. Knowledge Base.

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The Effect of Micro bubbles and Bulbous Bow on the Aerodynamic Efficiency of a Boat

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  1. The Effect of Micro bubbles and Bulbous Bow on the Aerodynamic Efficiency of a Boat Harry Kucharczyk

  2. Need • $438 Million spent on annual boating fuel (Lipton 95) • 99.8% of goods are transported by ships • Carbon Dioxide emissions continue to rise www.unido-ichet.org

  3. Knowledge Base Bulbous Bow • Reduces shock wave • Decrease in friction drag http://www.globalsecurity.org www.marinefirefighting.com

  4. Knowledge Base Micro Bubbles • Inserted in the boundary layer • Decreased viscosity and density of the fluid www.impactlab.com

  5. Literature Review • McCormick and Bhattchara (73)- injected hydrogen micro bubbles into the turbulent boundary layer • Madavan (84)- location and distribution of bubbles are essential • Kato (94)- determined reduced skin friction drag by 80% through the use of micro bubbles • Kodama (00)- performed experiments in a water tunnel with microbubbles generated in an air injection chamber by injecting air through a porous plate

  6. Do Ability • Water Tunnel is accessible in the lab • Boat has already been constructed • Bulbous bow can easily be inserted into the boat • Microbubbles can be made through a simple fish tank bubbler

  7. Purpose • Examine the skin friction drag reduction with the use of active and passive flow control

  8. Bibliography • Lipton, Douglas W., and Scott Miller. "Recreational Boating in Maryland: An Economic Impact Study, 1993-1994." 6 Mar. 1995. Maryland Marine Trades Conference. • http://www.me.berkeley.edu/~liepmann/assets/papavasiliou_transducers01.pdf • http://darwin.wcupa.edu/~biology/fish/pubs/pdf/ISSDR(drag%20reduction).pdf • http://www.its.caltech.edu/~ferrante/PAPERS/Navigator-2006-af-se.pdf • http://www.nmri.go.jp/turbulence/PDF/Kato.pdf

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