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Explosion dust particle size measurements.

R G Pinnick, G Fernandez, B D Hinds

    Applied Optics
    |January 1, 1983
    PubMed
    Summary
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    High explosive detonations create bimodal dust size distributions, with larger particles dominating mass loading. This dust exhibits near-neutral extinction coefficients, crucial for understanding atmospheric effects.

    Area of Science:

    • Atmospheric science
    • Explosives engineering
    • Particle physics

    Background:

    • Detonation of high explosives generates significant dust clouds.
    • Understanding the properties of this dust is critical for predicting its atmospheric impact.

    Purpose of the Study:

    • To measure the size and concentration of dust particles from high explosive detonations.
    • To determine the optical properties, specifically extinction coefficients, of the generated dust.

    Main Methods:

    • In situ measurements using Knollenberg light-scattering counters and optical array probes.
    • Analysis of dust particle size distributions and mass loadings.
    • Calculation of extinction coefficients using measured size distributions and refractive indices.

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    Main Results:

    • Dust size distributions were consistently bimodal with mass mean radii of approximately 7 and 70 micrometers.
    • Peak aerosol mass loadings ranged from 0.05 to 10 g/m³.
    • Predicted extinction coefficients were nearly neutral (wavelength independent) and agreed with transmission measurements.

    Conclusions:

    • The study characterized explosive-generated dust, revealing a bimodal size distribution.
    • The dust's optical properties suggest near-neutral extinction, impacting atmospheric transmission.
    • Measured and predicted extinction coefficients align, validating the dust characterization methods.