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Article: Settling and coagulating behaviour of fractal aggregates

TitleSettling and coagulating behaviour of fractal aggregates
Authors
KeywordsAggregates
Coagulation
Fractal
Particles
Permeability
Settling velocity
Issue Date2000
PublisherI W A Publishing. The Journal's web site is located at http://www.iwapublishing.com/template.cfm?name=iwapwst
Citation
Water Science And Technology, 2000, v. 42 n. 3-4, p. 253-258 How to Cite?
AbstractSedimentation of fractal aggregates (200-1000 μm) and their coagulation with suspended small particles (1.5 μm) were investigated through both theoretical analysis and experimental measurement. The settling velocities of the aggregates were nearly 3 times faster than calculated using Stokes' law. Attachments of small particles on the aggregates were found to be 1 order of magnitude higher than predicted by a curvilinear collision model and 2 orders of magnitude lower than predicted by the rectilinear model. It is suggested that the internal flow through large pores within fractal aggregates likely contributed to the faster settling velocities and enhanced coagulation between the aggregates and suspended particles. The predictions for the interior flow rates and settling velocities of aggregates can be largely improved using a new fractal structure model in which aggregates are built directly from large clusters instead of the primary particles. | Sedimentation of fractal aggregates (200-1000 μm) and their coagulation with suspended small particles (1.5 μm) were investigated through both theoretical analysis and experimental measurement. The settling velocities of the aggregates were nearly 3 times faster than calculated using Stokes' law. Attachments of small particles on the aggregates were found to be 1 order of magnitude higher than predicted by a curvilinear collision model and 2 orders of magnitude lower than predicted by the rectilinear model. It is suggested that the internal flow through large pores within fractal aggregates likely contributed to the faster settling velocities and enhanced coagulation between the aggregates and suspended particles. The predictions for the interior flow rates and settling velocities of aggregates can be largely improved using a new fractal structure model in which aggregates are built directly from large clusters instead of the primary particles.
Persistent Identifierhttp://hdl.handle.net/10722/71647
ISSN
2015 Impact Factor: 1.064
2015 SCImago Journal Rankings: 0.469
References

 

DC FieldValueLanguage
dc.contributor.authorLi, XYen_HK
dc.contributor.authorLogan, BEen_HK
dc.date.accessioned2010-09-06T06:33:53Z-
dc.date.available2010-09-06T06:33:53Z-
dc.date.issued2000en_HK
dc.identifier.citationWater Science And Technology, 2000, v. 42 n. 3-4, p. 253-258en_HK
dc.identifier.issn0273-1223en_HK
dc.identifier.urihttp://hdl.handle.net/10722/71647-
dc.description.abstractSedimentation of fractal aggregates (200-1000 μm) and their coagulation with suspended small particles (1.5 μm) were investigated through both theoretical analysis and experimental measurement. The settling velocities of the aggregates were nearly 3 times faster than calculated using Stokes' law. Attachments of small particles on the aggregates were found to be 1 order of magnitude higher than predicted by a curvilinear collision model and 2 orders of magnitude lower than predicted by the rectilinear model. It is suggested that the internal flow through large pores within fractal aggregates likely contributed to the faster settling velocities and enhanced coagulation between the aggregates and suspended particles. The predictions for the interior flow rates and settling velocities of aggregates can be largely improved using a new fractal structure model in which aggregates are built directly from large clusters instead of the primary particles. | Sedimentation of fractal aggregates (200-1000 μm) and their coagulation with suspended small particles (1.5 μm) were investigated through both theoretical analysis and experimental measurement. The settling velocities of the aggregates were nearly 3 times faster than calculated using Stokes' law. Attachments of small particles on the aggregates were found to be 1 order of magnitude higher than predicted by a curvilinear collision model and 2 orders of magnitude lower than predicted by the rectilinear model. It is suggested that the internal flow through large pores within fractal aggregates likely contributed to the faster settling velocities and enhanced coagulation between the aggregates and suspended particles. The predictions for the interior flow rates and settling velocities of aggregates can be largely improved using a new fractal structure model in which aggregates are built directly from large clusters instead of the primary particles.en_HK
dc.languageengen_HK
dc.publisherI W A Publishing. The Journal's web site is located at http://www.iwapublishing.com/template.cfm?name=iwapwsten_HK
dc.relation.ispartofWater Science and Technologyen_HK
dc.subjectAggregatesen_HK
dc.subjectCoagulationen_HK
dc.subjectFractalen_HK
dc.subjectParticlesen_HK
dc.subjectPermeabilityen_HK
dc.subjectSettling velocityen_HK
dc.titleSettling and coagulating behaviour of fractal aggregatesen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0273-1223&volume=42 &issue=3/4&spage=253 &epage= 258&date=2000&atitle=Settling+and+Coagulating+Behaviour+of+Fractal+Aggregatesen_HK
dc.identifier.emailLi, XY:xlia@hkucc.hku.hken_HK
dc.identifier.authorityLi, XY=rp00222en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.scopuseid_2-s2.0-0033744465en_HK
dc.identifier.hkuros62655en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0033744465&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume42en_HK
dc.identifier.issue3-4en_HK
dc.identifier.spage253en_HK
dc.identifier.epage258en_HK
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridLi, XY=26642887900en_HK
dc.identifier.scopusauthoridLogan, BE=7202196555en_HK

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