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A low-cost solid aerosol generator of high stability.

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Bibliographic Details
Title: A low-cost solid aerosol generator of high stability.
Authors: Ward, R. X.1 (AUTHOR), Hack, M.1 (AUTHOR), McNeill, V. F.1 (AUTHOR) vfm2103@columbia.edu
Source: Aerosol Science & Technology. Jan2026, Vol. 60 Issue 1, p70-79. 10p.
Subjects: Surface area, Continuous flow reactors, Frequencies of oscillating systems, Nanostructured materials, Stability (Mechanics), Aerosols, Subwoofers, Solids
Abstract: A technique to aerosolize granular solid materials, first proposed by Weyel et al. (1984), is presented and characterized. A low-frequency audio speaker (subwoofer) is used to drive the airborne dispersion and entrainment of solid nanopowders into a continuous flow reactor. Surface area (SA) concentrations exceeding 10,000 μ m2 cm − 3 at the outlet of the generator can be generated stably on the order of hours ( ≈ 2% variation in SA concentration). Variation of the subwoofer's driving frequency between 40 and 100 Hz shows a surface area production maximum between 70 and 80 Hz, likely due to the resonance of the rubber dam upon which the feedstock rests. Reproducible control over the surface area is achievable in replicate trials of the same frequency, though some day-to-day output variability exists. Stable generation of particle surface area is achievable for over 6 h, a desirable outcome for experiments in a variety of contexts, in particular for steady-state flow reactors. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:A technique to aerosolize granular solid materials, first proposed by Weyel et al. (1984), is presented and characterized. A low-frequency audio speaker (subwoofer) is used to drive the airborne dispersion and entrainment of solid nanopowders into a continuous flow reactor. Surface area (SA) concentrations exceeding 10,000 μ m2 cm − 3 at the outlet of the generator can be generated stably on the order of hours ( ≈ 2% variation in SA concentration). Variation of the subwoofer's driving frequency between 40 and 100 Hz shows a surface area production maximum between 70 and 80 Hz, likely due to the resonance of the rubber dam upon which the feedstock rests. Reproducible control over the surface area is achievable in replicate trials of the same frequency, though some day-to-day output variability exists. Stable generation of particle surface area is achievable for over 6 h, a desirable outcome for experiments in a variety of contexts, in particular for steady-state flow reactors. [ABSTRACT FROM AUTHOR]
ISSN:02786826
DOI:10.1080/02786826.2025.2568021