Acoustic separation and electrostatic sampling of submicron particles suspended in air

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Acoustic separation and electrostatic sampling of submicron particles suspended in air

Imani Jajarmi, Ramin (author): KTH,Strömningsfysik

Robert, Etienne (thesis advisor): Polytechnique Montreal, Dep. of Mechanical Engineering

Prahl Wittberg, Lisa, Docent, 1978- (thesis advisor): KTH,Strömningsfysik,Linné Flow Center, FLOW

Fuchs, Laszlo (thesis advisor): KTH,Strömningsfysik

Wiklund, Martin (thesis advisor): KTH,Biomedicinsk fysik och röntgenfysik

Engvall, Klas (thesis advisor): KTH,Kemisk teknologi

Hawkes, Jeremy (opponent)

Cervantes, Michel, Professor (opponent): Lulea tekniska universitet

Åbom, Mats, 1954- (opponent): KTH,Linné Flow Center, FLOW

Roditcheva, Olga, Dr. (opponent): Volvo Cars

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(creator_code:org_t)

ISBN 9789177292210
Stockholm : KTH Royal Institute of Technology, 2016
English 77 s.
Series: TRITA-MEK, 0348-467X

Related links:: https://kth.diva-por... (primary) (Raw object); show more...; https://urn.kb.se/re...; show less...

Doctoral thesis (other academic/artistic)

Abstract Subject headings

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.

Subject headings

TEKNIK OCH TEKNOLOGIER -- Maskinteknik -- Strömningsmekanik och akustik (hsv//swe)
ENGINEERING AND TECHNOLOGY -- Mechanical Engineering -- Fluid Mechanics and Acoustics (hsv//eng)

Keyword

Acoustic
separation
acoustophoresis
Engineering Mechanics
Teknisk mekanik

Publication and Content Type

vet (subject category)
dok (subject category)

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By the author/editor: Imani Jajarmi, R ...; Robert, Etienne; Prahl Wittberg, ...; Fuchs, Laszlo; Wiklund, Martin; Engvall, Klas; show more...; Hawkes, Jeremy; Cervantes, Miche ...; Åbom, Mats, 1954 ...; Roditcheva, Olga ...; show less...

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ENGINEERING AND TECHNOLOGY: ENGINEERING AND ...; and Mechanical Engin ...; and Fluid Mechanics ...

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