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    Simulation of aerosol nucleation and growth in a turbulent mixing layer

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    Type
    Article
    Authors
    Zhou, Kun cc
    Attili, Antonio
    Alshaarawi, Amjad cc
    Bisetti, Fabrizio cc
    KAUST Department
    Clean Combustion Research Center
    Mechanical Engineering Program
    Physical Science and Engineering (PSE) Division
    Reactive Flow Modeling Laboratory (RFML)
    Date
    2014-06-26
    Online Publication Date
    2014-06-26
    Print Publication Date
    2014-06
    Permanent link to this record
    http://hdl.handle.net/10754/552125
    
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    Abstract
    A large-scale simulation of aerosol nucleation and growth in a turbulent mixing layer is performed and analyzed with the aim of elucidating the key processes involved. A cold gaseous stream is mixed with a hot stream of vapor, nanometer sized droplets nucleate as the vapor becomes supersaturated, and subsequently grow as more vapor condenses on their surface. All length and time scales of fluid motion and mixing are resolved and the quadrature method of moments is used to describe the dynamics of the condensing, non-inertial droplets. The results show that a region of high nucleation rate is located near the cold, dry stream, while particles undergo intense growth via condensation on the hot, humid vapor side. Supersaturation and residence times are such that number densities are low and neither coagulation nor vapor scavenging due to condensation are significant. The difference in Schmidt numbers of aerosol particles (approximated as infinity) and temperature and vapor (near unity) causes a drift of the aerosol particles in scalar space and contributes to a large scatter in the conditional statistics of aerosol quantities. The spatial distribution of the aerosol reveals high volume fraction on the hot side of the mixing layer. This distribution is due to drift against the mean and is related to turbulent mixing, which displaces particles from the nucleation region (cold side) into the growth region (hot side). Such a mechanism is absent in laminar flows and is a distinct feature of turbulent condensing aerosols.
    Citation
    Simulation of aerosol nucleation and growth in a turbulent mixing layer 2014, 26 (6):065106 Physics of Fluids
    Publisher
    AIP Publishing
    Journal
    Physics of Fluids
    DOI
    10.1063/1.4884789
    Additional Links
    http://scitation.aip.org/content/aip/journal/pof2/26/6/10.1063/1.4884789
    ae974a485f413a2113503eed53cd6c53
    10.1063/1.4884789
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Mechanical Engineering Program; Clean Combustion Research Center

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