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Real Fluid Effects on an Accelerated Sphere Before Boundary-Layer Separation

Mellsen, S. B. and Waugh, J. G. and Ellis, A. T. (1966) Real Fluid Effects on an Accelerated Sphere Before Boundary-Layer Separation. In: Winter Annual Meeting and Energy Systems Exposition, November 27 - December 1, 1966, New York, NY.

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Studies were made on the apparent increase in mass on acceleration (added mass) of a sphere accelerated from rest and before boundary-layer separation, in cylinders of various diameters filled with water or oil. From a comparison of theoretical and experimentally obtained added masses, the following conclusions were drawn: In the absence of wall effects on the boundary layer, the wall shear stress over elements of the sphere can be approximated by the solution for the flat plate moving parallel to itself and the potential flow over the elements outside the boundary layer. The impulse on the elements is obtained by integration with respect to time, and the wall drag and drag impulse on the sphere by integration over the sphere surface. Good theoretical and experimental agreement obtains under the assumption that a mass of fluid, estimated from the wall drag impulse, is carried in the boundary layer and may be university distributed over the sphere.

Item Type:Conference or Workshop Item (Paper)
Additional Information:© 1966 ASME. Contributed by the Underwater Technology Division for presentation at the Winter Annual Meeting and Energy Systems Exposition, New York, N. Y., November 27-December 1, 1966, of The American Society of Mechanical Engineers. Manuscript received at ASME Headquarters, July 29, 1966. Paper No. 66-WA/UNT-6. The authors are indebted to Prof. A. J. Acosta for his many helpful suggestions in the conduct of the work. They are also indebted to Prof W. R. Smythe for providing valuable assistance in field theory, and to Prof. T. Y. Wu for many helpful discussions and review of the manuscript. This work was supported by the Department of the Navy , Bureau of Naval Weapons, Contract N600(l9)59368 to the California Institute of Technology and Task Assignment No. RRRE-04001/216-1/R009-0l-Ol to the U. S . Naval Ordnance Test Station, Pasadena, Calif.
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Department of the Navy, Bureau of Naval WeaponsN600(19)-596368
U. S. Naval Ordnance Test StationRRRE-04001/216-1/R009-01-01
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Hydrodynamics Laboratory193
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ID Code:49217
Deposited On:03 Sep 2014 23:42
Last Modified:03 Oct 2019 07:11

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