Ablation of silicate particles in high-speed continuum and transition flow with application to the collection of interplanetary dust particles

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Ablation, Dust Collectors, Glass, Interplanetary Dust, Silicates, Transition Flow, Continuum Flow, Electron Microscopy, Molecular Flow, Slip Flow, Spectrum Analysis

Scientific paper

The ablative deceleration of spheres in the continuum and slip regimes is studied using spherical 7.1-micron-diam soda-lime glass particles launched from vacuum at about 4500 m/sec speed through a 13-micron-thick plastic film into a capture chamber containing Xe at 0.1 or 0.2 atm pressure and 295 K temperature. The results of SEM examinations of the collected ablated particles showed that the ratio of the ablated-particle radius (Rf) to the initial radius (R0) increased with gas pressure (from Rf/R0 about 0.67 at 0.1 atm, to about 0.88 at 0.2 atm). A model was developed to describe the ablation and deceleration of spheres in high-speed continuum and slip flow. The pressure dependence predicted by the model agreed with experimental results.

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