Drag Coefficients of Microscopic Spheres in Free-molecule Flow PDF Download
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Author: A. S. Hersh
Publisher:
ISBN:
Category : Aerodynamics
Languages : en
Pages : 44
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Book Description
Author: A. S. Hersh
Publisher:
ISBN:
Category : Aerodynamics
Languages : en
Pages : 44
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Book Description
Author: A. S. Hersh
Publisher:
ISBN:
Category : Aerodynamics
Languages : en
Pages : 44
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Book Description
Author: John W. Boring
Publisher:
ISBN:
Category : Artificial satellites
Languages : en
Pages : 52
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Book Description
The drag coefficients for the Echo 1 and Explorer 24 spherical surfaces in an O environment were experimentally determined over an energy range of 4 to 200 eV. The experiment was performed by generating a beam of atomic oxygen ions of the proper energy, neutralizing a portion of the beam, and then allowing only the neutral O particles to strike a very sensitive torsion balance. The momentum transferred to the surface was determined from the deflection of the torsion balance. At the lower energies, the more intense ion beam had to be used instead of the neutral beam. The drag coefficients are found to be slightly greater than 2 at energies corresponding to satellite velocities.
Author: John Wayne Boring
Publisher:
ISBN:
Category :
Languages : en
Pages : 8
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Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 308
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Author: Y. Y. Lin Wang
Publisher:
ISBN:
Category :
Languages : en
Pages : 100
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The drag coefficient of an object moving in a rarefied gas can be expanded in terms of the inverse Knudsen number. In the reported equation one term represents the drag coefficient in the free molecular flow limit. It is shown that a second coefficient is determined by a set of well defined collision integrals associated with sequences of successive collisions among two molecules and the object. These collision integrals are evaluated for a disc and a sphere assuming that the gas molecules are reflected diffusively by the object. The molecules are treated as hard spheres and the drag coefficient is studied as a function of the velocity of the object. (Modified author abstract).
Author: John F. Wendt
Publisher:
ISBN:
Category :
Languages : en
Pages : 43
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A modulated force probe with a sensitivity in the microgram range was employed to measure the drag forces on spheres in the Mach 5 range with an R.M.S. error of + or - 1%. Flow properties in the free jet were used to calculate sphere drag coefficients. The resulting values cover the flow regimes from near-free-molecule to transitional. A correlation parameter - an 'effective' Knudsen number based on body-free stream molecular collisions - is shown to provide a reasonable correlation for a large variety of sphere drag measurements.
Author: United States. National Aeronautics and Space Administration. Scientific and Technical Information Division
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 436
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Author: United States. National Aeronautics and Space Administration Scientific and Technical Information Division
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 428
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Author: United States. Superintendent of Documents
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 1214
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