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    Parametric Analysis of Turbulent Wall Jet in Still Air Over a Transitional Rough, With Asymptotes of Fully Rough and Fully Smooth Wall Jets

    Source: Journal of Fluids Engineering:;2013:;volume( 135 ):;issue: 011::page 111203
    Author:
    Afzal, Noor
    ,
    Seena, Abu
    DOI: 10.1115/1.4025005
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: The novel scalings for streamwise variations of the flow in a turbulent wall jet over a fully smooth, transitional, and fully rough surfaces have been analyzed. The universal scaling for arbitrary wall roughness is considered in terms of the roughness friction Reynolds number (that arises from the stream wise variations of roughness in the flow direction) and roughness Reynolds number at the nozzle jet exit. The transitional rough wall jet functional forms have been proposed, whose numerical constants power law index and prefactor are estimated from best fit to the data for several variables, like, maximum wall jet velocity, boundary layer thickness at maxima of wall jet velocity, the jet half width, the friction factor and momentum integral, which are supported by the experimental data. The data shows that the two asymptotes of fully rough and fully smooth surfaces are colinear with transitional rough surface, predicting same constants for any variable of flow for full smooth, fully rough and transitional rough surfaces. There is no universality of scalings in terms of traditional variables as different expressions are needed for each stage of the transitional roughness. The experimental data provides very good support to our universal relations.
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      Parametric Analysis of Turbulent Wall Jet in Still Air Over a Transitional Rough, With Asymptotes of Fully Rough and Fully Smooth Wall Jets

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    http://yetl.yabesh.ir/yetl1/handle/yetl/151960
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    contributor authorAfzal, Noor
    contributor authorSeena, Abu
    date accessioned2017-05-09T00:59:18Z
    date available2017-05-09T00:59:18Z
    date issued2013
    identifier issn0098-2202
    identifier otherfe_135_11_111203.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/151960
    description abstractThe novel scalings for streamwise variations of the flow in a turbulent wall jet over a fully smooth, transitional, and fully rough surfaces have been analyzed. The universal scaling for arbitrary wall roughness is considered in terms of the roughness friction Reynolds number (that arises from the stream wise variations of roughness in the flow direction) and roughness Reynolds number at the nozzle jet exit. The transitional rough wall jet functional forms have been proposed, whose numerical constants power law index and prefactor are estimated from best fit to the data for several variables, like, maximum wall jet velocity, boundary layer thickness at maxima of wall jet velocity, the jet half width, the friction factor and momentum integral, which are supported by the experimental data. The data shows that the two asymptotes of fully rough and fully smooth surfaces are colinear with transitional rough surface, predicting same constants for any variable of flow for full smooth, fully rough and transitional rough surfaces. There is no universality of scalings in terms of traditional variables as different expressions are needed for each stage of the transitional roughness. The experimental data provides very good support to our universal relations.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleParametric Analysis of Turbulent Wall Jet in Still Air Over a Transitional Rough, With Asymptotes of Fully Rough and Fully Smooth Wall Jets
    typeJournal Paper
    journal volume135
    journal issue11
    journal titleJournal of Fluids Engineering
    identifier doi10.1115/1.4025005
    journal fristpage111203
    journal lastpage111203
    identifier eissn1528-901X
    treeJournal of Fluids Engineering:;2013:;volume( 135 ):;issue: 011
    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