Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/47265
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Título : Anumericalstudyoftheinfluenceofion–aerosolmixingonunipolarcharging
Autor : Alonso Gámez, Manuel, Alguacil, Francisco José, Borra, J.P.
Palabras clave : Unipolar charging
Charging efficiency
Ion–aerosol mixing
Electrostatic dispersion
Diffusion loss
Fecha de publicación : 2009
Editor: Elsevier
Citación : Journal of Aerosol Science 40 (8) :693 - 706 (2009)
Resumen: 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
Versión del editor: http://dx.doi.org/:10.1016/j.jaerosci.2009.04.004
URI : http://hdl.handle.net/10261/47265
ISSN: 0021-8502
DOI: 10.1016/j.jaerosci.2009.04.004
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