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The Influence of Air Flow Velocity and Particle Size on the Collection Efficiency of Electrostatic Aerosol Samplers
KTH, School of Engineering Sciences (SCI), Mechanics, Fluid Physics.ORCID iD: 0000-0002-4171-5091
KTH, School of Electrical Engineering (EES), Micro and Nanosystems.ORCID iD: 0000-0001-6915-257X
(Stanford university)
KTH, School of Electrical Engineering (EES), Micro and Nanosystems.ORCID iD: 0000-0001-8248-6670
Show others and affiliations
(English)Manuscript (preprint) (Other academic)
Keyword [en]
ESP, aerosol
National Category
Fluid Mechanics and Acoustics
Research subject
Engineering Mechanics
Identifiers
URN: urn:nbn:se:kth:diva-196855OAI: oai:DiVA.org:kth-196855DiVA: diva2:1049344
Funder
Swedish Research CouncilEU, FP7, Seventh Framework Programme, 604244
Note

QC 20161124

The research presented here has received funding from he KTH Linné FLOW Center, the Swedish Research Council (VR) and the European Unions Seventh Framework Programme (FP7) under Grant Agreement No. 604244 (Norosensor). 

Available from: 2016-11-24 Created: 2016-11-24 Last updated: 2016-11-24Bibliographically approved
In thesis
1. Acoustic separation and electrostatic sampling of submicron particles suspended in air
Open this publication in new window or tab >>Acoustic separation and electrostatic sampling of submicron particles suspended in air
2016 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

We investigate experimentally the effects of acoustic forces on submicron aerosol in a channel flow. This technique can potentially overcome some of the limitations of conventional separation systems and provide advanced manipulation capabilities such as sorting according to size or density. The theoretical framework for acoustophoresis at such small length scales where molecular effects are expected to be significant is still incomplete and in need of experimental validation. The main objectives of this thesis are to identify the physical limitations and capabilities of acoustophoretic manipulation for submicron aerosol particles.

Two sets of experiments were carried out: first, qualitative results revealed that acoustic manipulation is possible for submicron particles in air and that the acoustic force follows the trend expected by theoretical models developed for particles in inviscid fluids. The acoustic force on submicron particles was estimated in a second set of measurements performed with quantitative diagnostic tools. Comparison of these results with available theoretical models for the acoustic radiation forces demonstrates that for such small particles additional forces have to be considered. At submicron length scales, the magnitude of the forces observed is orders of magnitude higher than the predictions from the inviscid theory.

One potential application for acoustophoresis is specifically investigated in this thesis: assist electrostatic precipitation (ESP) samplers to target very small aerosols, such as those carrying airborne viruses. To identify the shortcomings of ESP samplers that acoustophoresis should overcome, two ESP designs have been investigated to quantify capture efficiency as a function of the particle size and of the air velocity in a wind tunnel. The results reveal that both designs have limitations when it comes to sampling submicron aerosol particles. When exposed to polydispersed suspensions they behave as low-pass filters.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2016. 77 p.
Series
TRITA-MEK, ISSN 0348-467X
Keyword
Acoustic, separation, acoustophoresis
National Category
Fluid Mechanics and Acoustics
Research subject
Engineering Mechanics
Identifiers
urn:nbn:se:kth:diva-196857 (URN)978-91-7729-221-0 (ISBN)
Public defence
2016-12-16, D3, Lindstedsvägen 5, Stockholm, 10:15 (English)
Opponent
Supervisors
Note

QC 20161125

Available from: 2016-11-25 Created: 2016-11-24 Last updated: 2016-11-25Bibliographically approved

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