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

Rulison, Aaron J. and Flagan, Richard C. and Ahrens, Thomas J. and Miller, Wayne F. (1991) Ablation of silicate particles in high-speed continuum and transition flow with application to the collection of interplanetary dust particles. Astrophysical Journal, 371 (1). pp. 432-442. ISSN 0004-637X. doi:10.1086/169905.

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A model for the ablation and deceleration of spheres in continuum and slip flow is presented. Experiments were conducted in which initially spherical 7.1 micron diameter soda-lime glass particles were launched from vacuum at ~4500 m s^(-1) through a 0.5 mil (13 micron) plastic film into a capture chamber containing xenon at 0.1 and 0.2 atm and 295 K. Samples of ablated particles were collected and inspected using scanning electron microscopy (SEM). It was found that the ratio of the ablated particle radius (R_f) to the initial radius (R_0) depends on the gas pressure such that at 0.1 atm, R_f/R_0 = 0.67 ± 0.08, and at 0.2 atm, R_f/R_0 = 0.88 ± 0.08. The model agrees with these results if the heat of ablation Q is set to 1.5 ± 0.2 MJ kg^(-1). This value of Q approximately corresponds to the energy needed to raise the particle temperature from 295 to 1300 K, the working point of soda-lime glass. This indicates that the mechanism of ablation is melting and blowing of material from the particle's surface.

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Flagan, Richard C.0000-0001-5690-770X
Additional Information:© 1991 American Astronomical Society. Provided by the NASA Astrophysics Data System. Received 1990 May 25; accepted 1990 September 26. We thank W. Logsden, B. Langedyk, and J. Vongraey at NASA-Ames Research Center and B. Barber at the California Institute of Technology for technical assistance. This research was supported in part by NASA grant NAGW1941, National Science Foundation grant number CTS-8813006, and the California Institute of Technology. Contribution # 4870, Division of Geological and Planetary Sciences.
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Subject Keywords:interplanetary medium - laboratory spectra
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Caltech Division of Geological and Planetary Sciences4870
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:50776
Deposited By: Tony Diaz
Deposited On:24 Oct 2014 18:09
Last Modified:10 Nov 2021 19:00

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