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    Quantitative Visualization of Surface Flows on Rotating Disks

    Source: Journal of Fluids Engineering:;1994:;volume( 116 ):;issue: 003::page 494
    Author:
    H.-M. Tzeng
    ,
    A. C. Munce
    ,
    L. Crawforth
    DOI: 10.1115/1.2910304
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: A novel scheme for the visualization of surface flows is developed. It utilizes the strong adhesion forces between micrometer-sized particles and solid surfaces to register the surface streaklines, or equivalently, streamlines for steady flows. Fluorescent particles are used to allow the spectral separation of particle fluorescence emission from morphology-related elastic light scattering from the surface. This scheme was employed to investigate the surface flow on rotating disks in a disk-drive-like environment. Trajectories of the streaklines were digitized and quantitatively analyzed using image processing for orientation and spatial distribution. The surface streaklines provide information about the boundary layers on the disk while the spreading angle of the jets in the self-pumped through-flow reveal details about the bulk flow outside the boundary layer. The spiral angle of the streaklines over a major portion of the disk surface was found to be in good agreement with the theory for laminar Ekman boundary layers. The spreading of the streaklines, reflecting the width of the self-pumped jets emanating from holes in the hub, was found to increase linearly with radius.
    keyword(s): Flow (Dynamics) , Visualization , Rotating Disks , Disks , Particulate matter , Boundary layers , Jets , Light scattering , Separation (Technology) , Force , Fluorescence , Image processing AND Emissions ,
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      Quantitative Visualization of Surface Flows on Rotating Disks

    URI
    http://yetl.yabesh.ir/yetl1/handle/yetl/113789
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    • Journal of Fluids Engineering

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    contributor authorH.-M. Tzeng
    contributor authorA. C. Munce
    contributor authorL. Crawforth
    date accessioned2017-05-08T23:44:33Z
    date available2017-05-08T23:44:33Z
    date copyrightSeptember, 1994
    date issued1994
    identifier issn0098-2202
    identifier otherJFEGA4-27087#494_1.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/113789
    description abstractA novel scheme for the visualization of surface flows is developed. It utilizes the strong adhesion forces between micrometer-sized particles and solid surfaces to register the surface streaklines, or equivalently, streamlines for steady flows. Fluorescent particles are used to allow the spectral separation of particle fluorescence emission from morphology-related elastic light scattering from the surface. This scheme was employed to investigate the surface flow on rotating disks in a disk-drive-like environment. Trajectories of the streaklines were digitized and quantitatively analyzed using image processing for orientation and spatial distribution. The surface streaklines provide information about the boundary layers on the disk while the spreading angle of the jets in the self-pumped through-flow reveal details about the bulk flow outside the boundary layer. The spiral angle of the streaklines over a major portion of the disk surface was found to be in good agreement with the theory for laminar Ekman boundary layers. The spreading of the streaklines, reflecting the width of the self-pumped jets emanating from holes in the hub, was found to increase linearly with radius.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleQuantitative Visualization of Surface Flows on Rotating Disks
    typeJournal Paper
    journal volume116
    journal issue3
    journal titleJournal of Fluids Engineering
    identifier doi10.1115/1.2910304
    journal fristpage494
    journal lastpage498
    identifier eissn1528-901X
    keywordsFlow (Dynamics)
    keywordsVisualization
    keywordsRotating Disks
    keywordsDisks
    keywordsParticulate matter
    keywordsBoundary layers
    keywordsJets
    keywordsLight scattering
    keywordsSeparation (Technology)
    keywordsForce
    keywordsFluorescence
    keywordsImage processing AND Emissions
    treeJournal of Fluids Engineering:;1994:;volume( 116 ):;issue: 003
    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
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