Experimental investigation of the flight of a sphere in weakly ionized air

Mishin, G. I.

doi:10.2514/6.1997-2298

Cited by 18 publications

(11 citation statements)

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“…Based on this, a model for the thermophoretic force was developed for a wide variety of Knudsen numbers as given by Eqs. (31)(32)(33). This model agrees well with resolved-surface simulations and experimental data while tending to the correct theoretical limits, but does not account for heat or mass transfer effects.…”

Section: Discussionsupporting

confidence: 77%

Compressibility and Rarefaction Effects on Drag of a Spherical Particle

2008

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A review of compressibility and rarefaction effects on spherical particle drag was conducted based on existing experimental data, theoretical limits, and direct simulation Monte Carlo method results. The data indicated a nexus point with respect to effects of Mach number and Knudsen number. In particular, it was found that a single drag coefficient (of about 1.63) is obtained for all particle conditions when the particle Reynolds number is about 45, and is independent of compressibility or rarefaction effects. At lower Reynolds numbers, the drag is dominated by rarefaction, and at higher Reynolds numbers, it is dominated by compressibility. The nexus, therefore, allows construction of two separate models for these two regimes. The compression-dominated regime is obtained using a modification of the Clift-Gauvin model to specifically incorporate Mach number effects. The resulting model was based on a wide range of experimental data and showed superior prediction robustness compared with previous models. For the rarefaction-dominated regime, the present model was constructed to directly integrate the theoretical creeping flow limits, including the incompressible continuum flow limit (Stokes drag), the incompressible weak rarefaction limit (Basset-Knudsen correction), and the incompressible free-molecular flow limit (Epstein theory). Empirical correlations are used to extend this model to finite particle Reynolds numbers within the rarefaction-dominated regime.

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Section: Discussionsupporting

confidence: 77%

Compressibility and Rarefaction Effects on Drag of a Spherical Particle

2008

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“…Given this fact, we cannot claim that we have presented the complete picture of diffusion in NiAl, even though we believe that the most important mechansims have been captured. The ongoing molecular-dynamics simulations 46 have only revealed three types of Ni vacancy jumps: NNN jumps, ͓110͔ 6JCs implemented by three two-atom transitions, and two-atom ͓111͔ jumps. The latter are short-lived and reverse after less than a picosecond.…”

Section: Discussionmentioning

confidence: 99%

“…46 An additional verification is essential since NEB calculations are based on a choice of the initial and final states of every atomic transition. The NEB method, therefore, can never guarantee that some unanticipated transitions are not missed in the calculations.…”

Section: Discussionmentioning

confidence: 99%

Evaluation of diffusion mechanisms in NiAl by embedded-atom and first-principles calculations

2003

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“…The hypersonic flight literature documents a number of efforts to develop such analyses, including those for aerodynamics (References [7,8]) and propulsion (References [9,10]). Meanwhile, several more efforts seek experimental solutions, as described in References [11][12][13][14]. Yet Blankson et al discuss the "inability of ground facilities to generate hypersonic test data at real flight conditions for validating design tools" [15].…”

Section: Figurementioning

confidence: 99%

A Bayesian Approach to Non-Deterministic Hypersonic Vehicle Design

Mantis

Mavris

2001

SAE Technical Paper Series

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Affordable, reliable endo-and exoatmospheric transportation, for both the military and commercial sectors, grows in importance as the world grows smaller and space exploration and exploitation increasingly impact our daily lives. However, the impact of disciplinary, operational, and technological uncertainties inhibit the design of the requisite hypersonic vehicles, an inherently multidisciplinary and non-deterministic process. Without investigation, these components of design uncertainty undermine the designers' decision-making confidence.

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Experimental investigation of the flight of a sphere in weakly ionized air

Cited by 18 publications

References 0 publications

Compressibility and Rarefaction Effects on Drag of a Spherical Particle

Compressibility and Rarefaction Effects on Drag of a Spherical Particle

Evaluation of diffusion mechanisms in NiAl by embedded-atom and first-principles calculations

A Bayesian Approach to Non-Deterministic Hypersonic Vehicle Design

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