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Título

Anumericalstudyoftheinfluenceofion–aerosolmixingonunipolarcharging

AutorAlonso Gámez, Manuel; Alguacil, Francisco José; Borra, J.P.
Palabras claveUnipolar charging
Charging efficiency
Ion–aerosol mixing
Electrostatic dispersion
Diffusion loss
Fecha de publicación2009
EditorElsevier
CitaciónJournal of Aerosol Science 40 (8) :693 - 706 (2009)
ResumenA 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
Versión del editorhttp://dx.doi.org/:10.1016/j.jaerosci.2009.04.004
URIhttp://hdl.handle.net/10261/47265
DOI10.1016/j.jaerosci.2009.04.004
ISSN0021-8502
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