A Study of Sphere Drag in the Transition from Continuum to Free Molecular Flow PDF Download
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Author: K. S. Hadjimichalis
Publisher:
ISBN:
Category :
Languages : en
Pages : 145
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Book Description
Author: K. S. Hadjimichalis
Publisher:
ISBN:
Category :
Languages : en
Pages : 145
Get Book Here
Book Description
Author: K. S. Hadjimichalis
Publisher:
ISBN:
Category :
Languages : en
Pages : 144
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Book Description
Author: A. B. Bailey
Publisher:
ISBN:
Category :
Languages : en
Pages : 97
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Book Description
A comprehensive set of measurements was made in a ballistic range which permits the sphere drag coefficient to be derived with an uncertainty of approximately +2 or -2 percent in the flight regime 0.1
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 296
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Book Description
Author: George J. Maslach
Publisher:
ISBN:
Category : Air resistance
Languages : en
Pages : 40
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Book Description
Author: Y. Y. Lin Wang
Publisher:
ISBN:
Category :
Languages : en
Pages : 100
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Book Description
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: David L. Whitfield
Publisher:
ISBN:
Category :
Languages : en
Pages : 45
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Book Description
Results are presented of sphere drag measurements made in the free-molecular and transitional flow regimes. The drag data were obtained using a drag balance and the free-flight technique. Conditions for which measurements were made are given. An analysis of the drag on a sphere in rarefied flow is also presented, and the results are compared with experimental data and other theories. The analytical results well predict the trend of the experimental data in the transition regime and remain valid at Knudsen numbers for which previous theories are not applicable. (Author).
Author: David J. Masson
Publisher:
ISBN:
Category : Atmospheric density
Languages : en
Pages : 38
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Book Description
Author: Robert M. L. Baker
Publisher:
ISBN:
Category :
Languages : en
Pages : 25
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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.
