Motion of tracer particles in supersonic flows

Factors that may act on particle motion in highspeed flow are investigated. The classical expressions of drag coefficient Co for a sphere are reviewed. Then, a drag expression is proposed, extending Cunningham's method to higher velocities and Knudsen numbers. This law, valid from continuum to...

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Bibliographic Details
Published in:Experiments in fluids 1999, Vol.26 (4), p.288-296
Main Authors: TEDESCHI, G, GOUIN, H, ELENA, M
Format: Article
Language:English
Subjects:
Compressible flows
shock and detonation phenomena
Exact sciences and technology
Fluid dynamics
Free molecular flows
Fundamental areas of phenomenology (including applications)
Instrumentation for fluid dynamics
Physics
Rarefied gas dynamics
Slip flows
Supersonic and hypersonic flows
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Summary:Factors that may act on particle motion in highspeed flow are investigated. The classical expressions of drag coefficient Co for a sphere are reviewed. Then, a drag expression is proposed, extending Cunningham's method to higher velocities and Knudsen numbers. This law, valid from continuum to free molecule conditions for Re up to 200 and M up to 1 (where Re and M are, respectively, the Reynolds and Mach numbers based on relative velocity), is used to compare calculated and experimental values of the drag coefficient, as well as the particle velocities across an oblique shock wave. Calculated results are found to be in agreement with experiments. (Author)
ISSN:0723-4864
1432-1114
DOI:10.1007/s003480050291