Abstract
An experimental method to study the concentration of micron-sized aerosols in a low-frequency sound field was developed. The physical mechanism for acoustic aerosol concentration in a low-frequency sound field is the asymmetric Stokes drag which has been predicted to exceed the effects of radiation pressure for typical aerosol sizes [Meegan and Ilinskii, J. Acoust. Soc. Am. 114, 2387 (2003)]. Related experiments were conducted in which 5 micron aerosol was drawn through a small duct that was driven in a transverse resonant mode with peak sound pressure levels of greater than 150 dB re 20 microPascals and frequencies in the range 1 to 10 kHz. The aerosol stream was illuminated by a laser sheet through the transparent walls of the duct in order to visualize (by video) the effects of the sound field. The experiments confirm the basic feature of the asymmetric Stokes drag model—specifically, the aerosol is observed to concen- trate along acoustic velocity nodes. Ongoing experiments to quantify the level of concentration will be described. [Work supported by RDECOM.]
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