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Microbubble Drag Reduction on an Axisymmetric Body under an Applied Axial Pressure Gradient

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Studies in Turbulence

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Abstract

The influence of both a favorable and unfavorable axial pressure gradient on the reduction of skin friction drag on a 87 mm diameter microbubble body has been studied at the 12-inch diameter water tunnel at ARL Penn State. The unfavorable gradient separated the flow at approach speeds above 4.6 m/s. The gas flow rate at which separation ensued was roughly independent of tunnel speed. The favorable pressure gradient was found to inhibit the drag reduction mechanism substantially.

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References

  1. Deutsch, S., Castano, J., “Microbubble Skin Friction Reduction on an Axisymmetric Body,” Physics of Fluids, 29,11,3590,1986.

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  2. Deutsch, S. and Pal, S., “Local Shear Stress Measurements on an Axisymmetric Body in a Microbubble Boundary Layer,” to appear in the December issue of the Physics of Fluids.

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  3. Madavan, N.K.,Deutsch, S., Merkle, C.L.,“Reduction of Turbulent Skin Friction by Microbubbles,” Physics of Fluids, 27,2,356,1984.

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  4. Madavan,N.K., Deutsch, S., Merkle, C.L.,“Measurements of Local Skin Friction in a Microbubble Modified Turbulent Boundary Layer,” Journal of Fluid Mechanics, 156,237,1985.

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  5. Pal, S., Merkle, C.L., Deutsch S.,“Bubble Characteristics and Trajectories in a Microbubble Boundary Layer,” Physics of Fluids,31,4,744,1988.

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Author information

Authors and Affiliations

  1. The Applied Research Laboratory, The Pennsylvania State University, State College, PA, Post Office Box 30, PA, USA, 16801

    Steven Deutsch & Henry Clark III

Authors
  1. Steven Deutsch
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  2. Henry Clark III
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Editor information

Editors and Affiliations

  1. Theoretical Flow Physics Branch, NASA Langley Research Center, 23665-5225, Hampton, Virginia, USA

    Thomas B. Gatski

  2. ICASE, NASA Langley Research Center, 23665-5225, Hampton, Virginia, USA

    Charles G. Speziale  & Sutanu Sarkar  & 

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© 1992 Springer-Verlag New York, Inc.

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Deutsch, S., Clark, H. (1992). Microbubble Drag Reduction on an Axisymmetric Body under an Applied Axial Pressure Gradient. In: Gatski, T.B., Speziale, C.G., Sarkar, S. (eds) Studies in Turbulence. Springer, New York, NY. https://doi.org/10.1007/978-1-4612-2792-2_41

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  • DOI: https://doi.org/10.1007/978-1-4612-2792-2_41

  • Publisher Name: Springer, New York, NY

  • Print ISBN: 978-1-4612-7672-2

  • Online ISBN: 978-1-4612-2792-2

  • eBook Packages: Springer Book Archive

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