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Estimation of acoustic forces on submicron aerosol particles in a standing wave field
KTH, School of Engineering Sciences (SCI), Mechanics.ORCID iD: 0000-0002-4171-5091
KTH, School of Engineering Sciences (SCI), Mechanics. Polytechnique Montreal, Department of Mechanical Engineering, Montreal, Quebec, Canada.
2018 (English)In: Aerosol Science and Technology, ISSN 0278-6826, E-ISSN 1521-7388, Vol. 52, no 1, p. 57-68Article in journal (Refereed) Published
Abstract [en]

The net acoustic force acting on submicron particles suspended in a gas and exposed to a standing wave field is investigated as a function of particle size, by measuring both the aerosol number density and size distribution in a flow-through resonator. By taking into account all contributions relevant to the net force, this experimental study provides a first estimate for the acoustic radiation force in a size range where molecular effects are expected to be significant. The experiment consists of an electrostatic transducer generating a standing wave in the 50–80 kHz frequency range, with the submicron aerosol particles concentrated at pressure antinodes located across the height of a rectangular channel. A section of the flow is sampled isokinetically and analyzed using a Scanning Mobility Particle Sizer (SMPS), while the nodal patterns are visualized simultaneously using light scattering. The net acoustic force is calculated from their measured displacement along the axis of the 1D standing wave field. The component of this force resulting from radiation pressure is estimated by subtracting contributions from other forces. The results provide the first experimental estimation of the size dependence of the acoustic contrast factor for submicron aerosol particles, demonstrating the possibility of performing acoustic separation for diameters as small as 150 nm. Copyright © 2018 American Association for Aerosol Research. 

Place, publisher, year, edition, pages
Taylor and Francis Inc. , 2018. Vol. 52, no 1, p. 57-68
Keywords [en]
Aerosols, Atmospheric movements, Elastic waves, Light scattering, Particle size, Radiation effects, Shape memory effect, Acoustic radiation force, Acoustic separation, Electrostatic transducers, Experimental estimations, Rectangular channel, Scanning mobility particle sizer, Standing-wave field, Sub-micron particles, Acoustics, aerosol, Article, conceptual framework, force, priority journal, radiation
National Category
Mechanical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-223182DOI: 10.1080/02786826.2017.1383968ISI: 000427366900007Scopus ID: 2-s2.0-85032340108OAI: oai:DiVA.org:kth-223182DiVA, id: diva2:1186378
Funder
Swedish Research CouncilEU, FP7, Seventh Framework Programme
Note

Export Date: 13 February 2018; Article; CODEN: ASTYD; Correspondence Address: Robert, E.; Polytechnique Montréal Département de génie mécanique, C.P. 6079, succ. Centre-Ville Montréal, Canada; email: etienne.robert@polymtl.ca. Funding Agency KTH Linne FLOW Center , QC 20180228

Available from: 2018-02-28 Created: 2018-02-28 Last updated: 2018-04-04Bibliographically approved

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Imani Jajarmi, Ramin

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