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    Graupel and Hail Terminal Velocities: Does a “Supercritical” Reynolds Number Apply?

    Source: Journal of the Atmospheric Sciences:;2014:;Volume( 071 ):;issue: 009::page 3392
    Author:
    Heymsfield, Andrew
    ,
    Wright, Robert
    DOI: 10.1175/JAS-D-14-0034.1
    Publisher: American Meteorological Society
    Abstract: his study characterizes the terminal velocities of heavily rimed ice crystals and aggregates, graupel, and hail using a combination of recent drag coefficient and particle bulk density observations. Based on a nondimensional Reynolds number (Re)?Best number (X) approach that applies to atmospheric temperatures and pressures where these particles develop and fall, the authors develop a relationship that spans a wide range of particle sizes. The Re?X relationship can be used to derive the terminal velocities of rimed particles for many applications. Earlier observations suggest that a ?supercritical? Reynolds number is reached where the drag coefficient for large spherical ice?hail?drops precipitously and the terminal velocities increase rapidly. The authors draw on observations and model simulations for slightly roughened large ice particles that suggest that the critical Reynolds number is dampened and that the rapid increase in the terminal velocity of smooth spherical ice particles rarely occurs for natural hailstones.
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      Graupel and Hail Terminal Velocities: Does a “Supercritical” Reynolds Number Apply?

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    contributor authorHeymsfield, Andrew
    contributor authorWright, Robert
    date accessioned2017-06-09T16:57:23Z
    date available2017-06-09T16:57:23Z
    date copyright2014/09/01
    date issued2014
    identifier issn0022-4928
    identifier otherams-77028.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4219541
    description abstracthis study characterizes the terminal velocities of heavily rimed ice crystals and aggregates, graupel, and hail using a combination of recent drag coefficient and particle bulk density observations. Based on a nondimensional Reynolds number (Re)?Best number (X) approach that applies to atmospheric temperatures and pressures where these particles develop and fall, the authors develop a relationship that spans a wide range of particle sizes. The Re?X relationship can be used to derive the terminal velocities of rimed particles for many applications. Earlier observations suggest that a ?supercritical? Reynolds number is reached where the drag coefficient for large spherical ice?hail?drops precipitously and the terminal velocities increase rapidly. The authors draw on observations and model simulations for slightly roughened large ice particles that suggest that the critical Reynolds number is dampened and that the rapid increase in the terminal velocity of smooth spherical ice particles rarely occurs for natural hailstones.
    publisherAmerican Meteorological Society
    titleGraupel and Hail Terminal Velocities: Does a “Supercritical” Reynolds Number Apply?
    typeJournal Paper
    journal volume71
    journal issue9
    journal titleJournal of the Atmospheric Sciences
    identifier doi10.1175/JAS-D-14-0034.1
    journal fristpage3392
    journal lastpage3403
    treeJournal of the Atmospheric Sciences:;2014:;Volume( 071 ):;issue: 009
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
    نرم افزار کتابخانه دیجیتال "دی اسپیس" فارسی شده توسط یابش برای کتابخانه های ایرانی | تماس با یابش
    yabeshDSpacePersian