Tests of spheres with reference to Reynolds number, turbulence, and surface roughness

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Description

The behavior of the Reynolds Number of the sphere is explained (in known manner) with the aid of the boundary-layer theory. Rear spindles may falsify, under certain conditions, the supercritical sphere drag, while suspension wires in the space behind the sphere leave no traceable influence. The critical Reynolds Number of the sphere was arrived at by an unconventional method; that is, by determining the critical wind speed at which the static pressure at the back of the sphere is the same as that of the undisturbed flow. The method makes it possible to interpret the critical Reynolds Number with only ... continued below

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Hoerner, S October 1, 1935.

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This report is part of the collection entitled: National Advisory Committee for Aeronautics Collection and one other and was provided by UNT Libraries Government Documents Department to Digital Library, a digital repository hosted by the UNT Libraries. It has been viewed 151 times , with 9 in the last month . More information about this report can be viewed below.

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  • Main Title: Tests of spheres with reference to Reynolds number, turbulence, and surface roughness
  • Series Title: NACA Technical Memorandums

Description

The behavior of the Reynolds Number of the sphere is explained (in known manner) with the aid of the boundary-layer theory. Rear spindles may falsify, under certain conditions, the supercritical sphere drag, while suspension wires in the space behind the sphere leave no traceable influence. The critical Reynolds Number of the sphere was arrived at by an unconventional method; that is, by determining the critical wind speed at which the static pressure at the back of the sphere is the same as that of the undisturbed flow. The method makes it possible to interpret the critical Reynolds Number with only one test station.

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  • : 93R23560
  • URL: http://hdl.handle.net/2060/19930094640 External Link
  • Report No.: NACA-TM-777
  • Center for AeroSpace Information Number: 19930094640
  • Archival Resource Key: ark:/67531/metadc63443

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National Advisory Committee for Aeronautics Collection

The National Advisory Committee for Aeronautics (NACA) was a U.S. federal agency founded on March 3, 1915 to undertake, promote, and institutionalize aeronautical research. On October 1, 1958 the agency was dissolved, and its assets and personnel transferred to the newly created National Aeronautics and Space Administration (NASA).

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Creation Date

  • October 1, 1935

Added to The UNT Digital Library

  • Nov. 17, 2011, 5:13 p.m.

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  • Feb. 6, 2017, 3:57 p.m.

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Hoerner, S. Tests of spheres with reference to Reynolds number, turbulence, and surface roughness, report, October 1, 1935; (digital.library.unt.edu/ark:/67531/metadc63443/: accessed December 11, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.