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    Reduced Rough-Surface Parametrization for Use With the Discrete-Element Model

    Source: Journal of Turbomachinery:;2009:;volume( 131 ):;issue: 002::page 21020
    Author:
    Stephen T. McClain
    ,
    Jason M. Brown
    DOI: 10.1115/1.2952379
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: The discrete-element model for flows over rough surfaces was recently modified to predict drag and heat transfer for flow over randomly rough surfaces. However, the current form of the discrete-element model requires a blockage fraction and a roughness-element diameter distribution as a function of height to predict the drag and heat transfer of flow over a randomly rough surface. The requirement for a roughness-element diameter distribution at each height from the reference elevation has hindered the usefulness of the discrete-element model and inhibited its incorporation into a computational fluid dynamics (CFD) solver. To incorporate the discrete-element model into a CFD solver and to enable the discrete-element model to become a more useful engineering tool, the randomly rough surface characterization must be simplified. Methods for determining characteristic diameters for drag and heat transfer using complete three-dimensional surface measurements are presented. Drag and heat transfer predictions made using the model simplifications are compared to predictions made using the complete surface characterization and to experimental measurements for two randomly rough surfaces. Methods to use statistical surface information, as opposed to the complete three-dimensional surface measurements, to evaluate the characteristic dimensions of the roughness are also explored.
    keyword(s): Surface roughness , Measurement , Flow (Dynamics) AND Heat transfer ,
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      Reduced Rough-Surface Parametrization for Use With the Discrete-Element Model

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    http://yetl.yabesh.ir/yetl1/handle/yetl/142197
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    contributor authorStephen T. McClain
    contributor authorJason M. Brown
    date accessioned2017-05-09T00:35:53Z
    date available2017-05-09T00:35:53Z
    date copyrightApril, 2009
    date issued2009
    identifier issn0889-504X
    identifier otherJOTUEI-28754#021020_1.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/142197
    description abstractThe discrete-element model for flows over rough surfaces was recently modified to predict drag and heat transfer for flow over randomly rough surfaces. However, the current form of the discrete-element model requires a blockage fraction and a roughness-element diameter distribution as a function of height to predict the drag and heat transfer of flow over a randomly rough surface. The requirement for a roughness-element diameter distribution at each height from the reference elevation has hindered the usefulness of the discrete-element model and inhibited its incorporation into a computational fluid dynamics (CFD) solver. To incorporate the discrete-element model into a CFD solver and to enable the discrete-element model to become a more useful engineering tool, the randomly rough surface characterization must be simplified. Methods for determining characteristic diameters for drag and heat transfer using complete three-dimensional surface measurements are presented. Drag and heat transfer predictions made using the model simplifications are compared to predictions made using the complete surface characterization and to experimental measurements for two randomly rough surfaces. Methods to use statistical surface information, as opposed to the complete three-dimensional surface measurements, to evaluate the characteristic dimensions of the roughness are also explored.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleReduced Rough-Surface Parametrization for Use With the Discrete-Element Model
    typeJournal Paper
    journal volume131
    journal issue2
    journal titleJournal of Turbomachinery
    identifier doi10.1115/1.2952379
    journal fristpage21020
    identifier eissn1528-8900
    keywordsSurface roughness
    keywordsMeasurement
    keywordsFlow (Dynamics) AND Heat transfer
    treeJournal of Turbomachinery:;2009:;volume( 131 ):;issue: 002
    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