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Particle Number Reduction in Automotive Exhausts by Controlled Grouping
KTH, School of Industrial Engineering and Management (ITM), Centres, Competence Center for Gas Exchange (CCGEx).
KTH, School of Industrial Engineering and Management (ITM), Centres, Competence Center for Gas Exchange (CCGEx).
KTH, School of Industrial Engineering and Management (ITM), Centres, Competence Center for Gas Exchange (CCGEx).
2018 (English)In: SAE technical paper series, ISSN 0148-7191, Vol. 2018-AprilArticle in journal (Refereed) Published
Abstract [en]

Particulate emissions from internal combustion engines is a well-known issue with direct implications on air quality and human health. Recently there is an increased concern about the high number of ultrafine particles emitted from modern engines. Here we explore a concept for grouping these particles, reducing their total number and shifting the relative size distribution towards fewer larger particles. Particles having a non-zero relaxation time may be manipulated to yield regions of high particle concentration, accommodating agglomeration, when introduced into an oscillating flow field. The oscillating flow field is given by simple periodic geometrical changes of the exhaust pipe itself. It is discussed how the shape of these geometrical changes and also the engine pulses effect the grouping behavior for different size particles, including when Brownian motion becomes relevant. Simulations are performed using a bespoke 1D-model sufficient for the basic parameter studies of the concept given here. 

Place, publisher, year, edition, pages
SAE International , 2018. Vol. 2018-April
Keywords [en]
Air engines, Air quality, Brownian movement, Flow fields, Automotive exhaust, Basic parameters, Different sizes, Geometrical changes, Grouping behaviors, Particle concentrations, Particle numbers, Ultrafine particle, Oscillating flow
National Category
Mechanical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-227477DOI: 10.4271/2018-01-0330Scopus ID: 2-s2.0-85045519854OAI: oai:DiVA.org:kth-227477DiVA, id: diva2:1206216
Conference
10 April 2018 through 12 April 2018
Note

Conference code: 134884; Export Date: 9 May 2018; Conference Paper. QC 20180516

Available from: 2018-05-16 Created: 2018-05-16 Last updated: 2018-05-16Bibliographically approved

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  • apa
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