The effect of mixing rates on the formation and growth of condensation aerosols in a model stagnation flow

Handle URI:
http://hdl.handle.net/10754/564072
Title:
The effect of mixing rates on the formation and growth of condensation aerosols in a model stagnation flow
Authors:
Alshaarawi, Amjad ( 0000-0002-2350-3300 ) ; Bisetti, Fabrizio ( 0000-0001-5162-7805 )
Abstract:
A steady, laminar stagnation flow configuration is adopted to investigate numerically the interaction between condensing aerosol particles and gas-phase transport across a canonical mixing layer. The mixing rates are varied by adjusting the velocity and length scales of the stagnation flow parametrically. The effect of mixing rates on particle concentration, polydispersity, and mean droplet diameter is explored and discussed. This numerical study reveals a complex response of the aerosol to varying flow times. Depending on the flow time, the variation of the particle concentration in response to varying mixing rates falls into one of the two regimes. For fast mixing rates, the number density and volume fraction of the condensing particles increase with residence time (nucleation regime). On the contrary, for low mixing rates, number density decreases with residence time and volume fraction reaches a plateau (condensation regime). It is shown that vapor scavenging by the aerosol phase is key to explaining the transition between these two regimes. The results reported here are general and illustrate genuine features of the evolution of aerosols forming by condensation of supersaturated vapor from heat and mass transport across mixing layers.
KAUST Department:
Clean Combustion Research Center; Physical Sciences and Engineering (PSE) Division; Mechanical Engineering Program; Reactive Flow Modeling Laboratory (RFML)
Publisher:
Elsevier BV
Journal:
Journal of Aerosol Science
Issue Date:
Mar-2015
DOI:
10.1016/j.jaerosci.2014.11.004
Type:
Article
ISSN:
00218502
Appears in Collections:
Articles; Physical Sciences and Engineering (PSE) Division; Mechanical Engineering Program; Clean Combustion Research Center

Full metadata record

DC FieldValue Language
dc.contributor.authorAlshaarawi, Amjaden
dc.contributor.authorBisetti, Fabrizioen
dc.date.accessioned2015-08-03T12:30:51Zen
dc.date.available2015-08-03T12:30:51Zen
dc.date.issued2015-03en
dc.identifier.issn00218502en
dc.identifier.doi10.1016/j.jaerosci.2014.11.004en
dc.identifier.urihttp://hdl.handle.net/10754/564072en
dc.description.abstractA steady, laminar stagnation flow configuration is adopted to investigate numerically the interaction between condensing aerosol particles and gas-phase transport across a canonical mixing layer. The mixing rates are varied by adjusting the velocity and length scales of the stagnation flow parametrically. The effect of mixing rates on particle concentration, polydispersity, and mean droplet diameter is explored and discussed. This numerical study reveals a complex response of the aerosol to varying flow times. Depending on the flow time, the variation of the particle concentration in response to varying mixing rates falls into one of the two regimes. For fast mixing rates, the number density and volume fraction of the condensing particles increase with residence time (nucleation regime). On the contrary, for low mixing rates, number density decreases with residence time and volume fraction reaches a plateau (condensation regime). It is shown that vapor scavenging by the aerosol phase is key to explaining the transition between these two regimes. The results reported here are general and illustrate genuine features of the evolution of aerosols forming by condensation of supersaturated vapor from heat and mass transport across mixing layers.en
dc.publisherElsevier BVen
dc.subjectCondensationen
dc.subjectHomogeneous nucleationen
dc.subjectPolydispersity indexen
dc.subjectQuadrature Method of Momentsen
dc.subjectStagnation flowen
dc.titleThe effect of mixing rates on the formation and growth of condensation aerosols in a model stagnation flowen
dc.typeArticleen
dc.contributor.departmentClean Combustion Research Centeren
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.contributor.departmentMechanical Engineering Programen
dc.contributor.departmentReactive Flow Modeling Laboratory (RFML)en
dc.identifier.journalJournal of Aerosol Scienceen
kaust.authorBisetti, Fabrizioen
kaust.authorAlshaarawi, Amjaden
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