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    Temperature and Supersaturation Dependent Nucleation Rates of Water by Molecular Cluster Model Calculations

    Source: Journal of the Atmospheric Sciences:;1988:;Volume( 045 ):;issue: 020::page 2979
    Author:
    Salk, Sung-Ho Suck
    ,
    Lutrus, C. K.
    ,
    Hagen, D. E.
    DOI: 10.1175/1520-0469(1988)045<2979:TASDNR>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: The homogeneous nucleation process for water has been the subject of great interest, despite the fact that water droplet formation in the atmosphere occurs by heterogeneous nucleation. This is because the homogeneous nucleation process is the simplest of the nucleation processes to treat, both theoretically and experimentally, and because it is strongly dependent on, and hence can be used to illuminate, the molecular interactions and processes that are important for heterogeneous nucleation and aerosol hydration. Using a microphysical approach to nucleation, we present an extensive study of water nucleation rates for wide ranges of both temperature and supersaturation ratio. Based on the fundamental molecular properties of clusters instead of bulk properties, the microphysical approach is demonstrated to predict good agreement with measured nucleation rates over this broad range of conditions. Predicted critical sizes for nucleation are found to be relatively small, and are in the molecular cluster size regime rather than in a size regime that should be characterized by bulk values. Estimated sticking coefficient values cover the range of ?0.9 to ?0.2 for the temperature range considered, whereas sticking coefficient values corresponding to Becker-Doring theory suffer an unreasonably large three-orders of magnitude decrease for temperature increase from 220 K to 285 K.
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      Temperature and Supersaturation Dependent Nucleation Rates of Water by Molecular Cluster Model Calculations

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4156076
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    contributor authorSalk, Sung-Ho Suck
    contributor authorLutrus, C. K.
    contributor authorHagen, D. E.
    date accessioned2017-06-09T14:28:28Z
    date available2017-06-09T14:28:28Z
    date copyright1988/10/01
    date issued1988
    identifier issn0022-4928
    identifier otherams-19908.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4156076
    description abstractThe homogeneous nucleation process for water has been the subject of great interest, despite the fact that water droplet formation in the atmosphere occurs by heterogeneous nucleation. This is because the homogeneous nucleation process is the simplest of the nucleation processes to treat, both theoretically and experimentally, and because it is strongly dependent on, and hence can be used to illuminate, the molecular interactions and processes that are important for heterogeneous nucleation and aerosol hydration. Using a microphysical approach to nucleation, we present an extensive study of water nucleation rates for wide ranges of both temperature and supersaturation ratio. Based on the fundamental molecular properties of clusters instead of bulk properties, the microphysical approach is demonstrated to predict good agreement with measured nucleation rates over this broad range of conditions. Predicted critical sizes for nucleation are found to be relatively small, and are in the molecular cluster size regime rather than in a size regime that should be characterized by bulk values. Estimated sticking coefficient values cover the range of ?0.9 to ?0.2 for the temperature range considered, whereas sticking coefficient values corresponding to Becker-Doring theory suffer an unreasonably large three-orders of magnitude decrease for temperature increase from 220 K to 285 K.
    publisherAmerican Meteorological Society
    titleTemperature and Supersaturation Dependent Nucleation Rates of Water by Molecular Cluster Model Calculations
    typeJournal Paper
    journal volume45
    journal issue20
    journal titleJournal of the Atmospheric Sciences
    identifier doi10.1175/1520-0469(1988)045<2979:TASDNR>2.0.CO;2
    journal fristpage2979
    journal lastpage2986
    treeJournal of the Atmospheric Sciences:;1988:;Volume( 045 ):;issue: 020
    contenttypeFulltext
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