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Article: Collision frequencies between fractal aggregates and small particles in a turbulently sheared fluid

TitleCollision frequencies between fractal aggregates and small particles in a turbulently sheared fluid
Authors
KeywordsLatex
Microsphere
Airborne particle
Frequency analysis
Shear rate
Issue Date1997
PublisherAmerican Chemical Society. The Journal's web site is located at http://pubs.acs.org/est
Citation
Environmental Science And Technology, 1997, v. 31 n. 4, p. 1237-1242 How to Cite?
AbstractThree groups of aggregates with fractal dimensions of 1.89 ±0 0.06, 2.21 ± 0.06, and 2.47 ± 0.10 were generated by coagulation of latex microspheres (2.85 μm) in a Jartest (paddle-mixing) device. The collision rates between these fractal aggregates (200-1000 μm) and small (1.48 μm) particles were measured in the turbulent shear environment of the paddle mixer at mean shear rates of 2.1, 7.3, and 14.7 s-1. Collision frequencies were 5 orders of magnitude higher than predicted by a curvilinear model but 2 orders of magnitude lower than predicted by a rectilinear model. Collision frequencies much higher than predicted by the curvilinear collision kernel were attributed to significant flow through the interior of the fractal aggregates. The fluid shear rate (G) and the aggregate fractal dimension (O) affected the collision frequency function (β) between fractal aggregates and small particles, resulting in β ~ G(1-0.33D). According to this relationship, as D → 0, the aggregates become infinitely porous and β becomes proportional to G1 as described by a rectilinear collision model based on aggregates sweeping out all fluid within their pathway. As aggregates become less fractal and D → 3, β becomes relatively insensitive to the magnitude of G as predicted by a curvilinear model.
Persistent Identifierhttp://hdl.handle.net/10722/71027
ISSN
2015 Impact Factor: 5.393
2015 SCImago Journal Rankings: 2.664
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorLi, Xen_HK
dc.contributor.authorLogan, BEen_HK
dc.date.accessioned2010-09-06T06:28:15Z-
dc.date.available2010-09-06T06:28:15Z-
dc.date.issued1997en_HK
dc.identifier.citationEnvironmental Science And Technology, 1997, v. 31 n. 4, p. 1237-1242en_HK
dc.identifier.issn0013-936Xen_HK
dc.identifier.urihttp://hdl.handle.net/10722/71027-
dc.description.abstractThree groups of aggregates with fractal dimensions of 1.89 ±0 0.06, 2.21 ± 0.06, and 2.47 ± 0.10 were generated by coagulation of latex microspheres (2.85 μm) in a Jartest (paddle-mixing) device. The collision rates between these fractal aggregates (200-1000 μm) and small (1.48 μm) particles were measured in the turbulent shear environment of the paddle mixer at mean shear rates of 2.1, 7.3, and 14.7 s-1. Collision frequencies were 5 orders of magnitude higher than predicted by a curvilinear model but 2 orders of magnitude lower than predicted by a rectilinear model. Collision frequencies much higher than predicted by the curvilinear collision kernel were attributed to significant flow through the interior of the fractal aggregates. The fluid shear rate (G) and the aggregate fractal dimension (O) affected the collision frequency function (β) between fractal aggregates and small particles, resulting in β ~ G(1-0.33D). According to this relationship, as D → 0, the aggregates become infinitely porous and β becomes proportional to G1 as described by a rectilinear collision model based on aggregates sweeping out all fluid within their pathway. As aggregates become less fractal and D → 3, β becomes relatively insensitive to the magnitude of G as predicted by a curvilinear model.en_HK
dc.languageengen_HK
dc.publisherAmerican Chemical Society. The Journal's web site is located at http://pubs.acs.org/esten_HK
dc.relation.ispartofEnvironmental Science and Technologyen_HK
dc.subjectLatex-
dc.subjectMicrosphere-
dc.subjectAirborne particle-
dc.subjectFrequency analysis-
dc.subjectShear rate-
dc.titleCollision frequencies between fractal aggregates and small particles in a turbulently sheared fluiden_HK
dc.typeArticleen_HK
dc.identifier.emailLi, X:xlia@hkucc.hku.hken_HK
dc.identifier.authorityLi, X=rp00222en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1021/es960772oen_HK
dc.identifier.scopuseid_2-s2.0-0030747221en_HK
dc.identifier.hkuros24193en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0030747221&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume31en_HK
dc.identifier.issue4en_HK
dc.identifier.spage1237en_HK
dc.identifier.epage1242en_HK
dc.identifier.isiWOS:A1997WR54600067-
dc.publisher.placeUnited Statesen_HK
dc.identifier.scopusauthoridLi, X=26642887900en_HK
dc.identifier.scopusauthoridLogan, BE=7202196555en_HK

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