Physics of sub-micron cosmic dust particles

Details Physics of sub-micron cosmic dust particles Physics of sub-micron cosmic dust particles

Oct 1974

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974trw..rept.....r&link_type=abstract

Final Report TRW Systems Group, Redondo Beach, CA.

Physics

Cosmic Dust, Micrometeoroids, Argon, Heat Transfer, Oxygen, Radiation Counters

Scientific paper

Laboratory tests with simulated micrometeoroids to measure the heat transfer coefficient are discussed. Equations for ablation path length for electrically accelerated micrometeoroids entering a gas target are developed which yield guidelines for the laboratory measurement of the heat transfer coefficient. Test results are presented for lanthanum hexaboride (LaB6) microparticles in air, argon, and oxygen targets. The tests indicate the heat transfer coefficient has a value of approximately 0.9 at 30 km/sec, and that it increases to approximately unity at 50 km/sec and above. Test results extend to over 100 km/sec. Results are also given for two types of small particle detectors. A solid state capacitor type detector was tested from 0.61 km/sec to 50 km/sec. An impact ionization type detector was tested from 1.0 to 150 km/sec using LaB6 microparticles.

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