Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/47265
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Title: Anumericalstudyoftheinfluenceofion–aerosolmixingonunipolarcharging
Authors: Alonso Gámez, Manuel, Alguacil, Francisco José, Borra, J.P.
Keywords: Unipolar charging
Charging efficiency
Ion–aerosol mixing
Electrostatic dispersion
Diffusion loss
Issue Date: 2009
Publisher: Elsevier
Abstract: A theoreticalinvestigationhasbeencarriedouttoexaminetheeffectoftheinitialion–aerosol mixing stateontheresultingchargedfraction(extrinsicchargingefficiency)ofultrafinepar- ticles inacirculartubeunderlaminarflowconditions.Particleandionlosstothewallsby diffusion andelectrostaticdispersionweretakenintoaccountinthecalculations.Fourdif- ferent mixingstateswereconsideredattheinletsectionofthechargingtube:(I)uniform mixing ofionsandneutralparticles;(II)acoreofionssurroundedbyanenvelopeofneutral particles; (III)acoreofneutralparticlessurroundedbyanenvelopeofions;and(IV)theinlet section splitupintotwocircularsegments,onecontainingneutralparticlesalone,theother only ions.Thenumericalresultsshowthattheextrinsicchargingefficiencystronglydepends on theinitialmixingstate,themaximumefficiencybeingattainedformixingstateII,astate which canbeeasilyrealizedinpracticebyinjectingionsandparticlesintothechargerthrough two coaxialcylinders.TheworstcaseisthatofmixingstateIII,thereverseofII,inwhichthe neutral particlesareinjectedthroughtheinnercylinder,andtheunipolarionsthroughthe annular spacebetweentheinjectiontubes.Themainreasonunderlyingtheobservedbehavior is thestrongdependencyoftheionslossratetothewallontheirinitialspatialdistribution
Publisher version (URL): http://dx.doi.org/:10.1016/j.jaerosci.2009.04.004
URI: http://hdl.handle.net/10261/47265
ISSN: 0021-8502
???metadata.dc.identifier.doi???: 10.1016/j.jaerosci.2009.04.004
Citation: Journal of Aerosol Science 40 (8) :693 - 706 (2009)
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