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    Experimental Study of the Flow and Thermal Development of a Row of Cooling Jets Impinging on a Rotating Concave Surface

    Source: Journal of Turbomachinery:;2005:;volume( 127 ):;issue: 001::page 222
    Author:
    Hector Iacovides
    ,
    Jiankang Li
    ,
    Zeyuan Xu
    ,
    Diamantis Kounadis
    ,
    Brian E. Launder
    DOI: 10.1115/1.1812778
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: The paper reports an experimental study of impingement cooling in a rotating passage of semi-cylindrical cross section. Cooling fluid is injected from a row of five jet holes along the centerline of the flat surface of the passage and strikes the concave surface. The cooling passage rotates orthogonally about an axis parallel to that of the jets. Tests have been carried out, using water, both within the passage and as the jet fluid, at a fixed Reynolds number of 15,000, for clockwise and counter-clockwise rotation. Local Nusselt number measurements, using the liquid-crystal technique, show that under stationary conditions a high Nusselt number region develops around each impingement point, with secondary peaks half-way between impingement points. Rotation reduces heat transfer, leads to the disappearance of all secondary peaks and also, surprisingly, of some of the primary peaks. Flow visualization tests suggest that these changes in thermal behavior are caused because rotation increases the spreading rate of the jets. LDA and PIV measurements are also presented. They show that under stationary conditions the five jets exhibit a similar behavior, with their cores remaining intact up to the point of impingement at the top dead center. The LDA and PIV studies help explain the rather surprising thermal behavior under rotating conditions.
    keyword(s): Rotation , Flow (Dynamics) , Heat transfer , Cooling , Measurement , Jets , Flow visualization , Fluids AND Impingement cooling ,
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      Experimental Study of the Flow and Thermal Development of a Row of Cooling Jets Impinging on a Rotating Concave Surface

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    http://yetl.yabesh.ir/yetl1/handle/yetl/132855
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    contributor authorHector Iacovides
    contributor authorJiankang Li
    contributor authorZeyuan Xu
    contributor authorDiamantis Kounadis
    contributor authorBrian E. Launder
    date accessioned2017-05-09T00:18:18Z
    date available2017-05-09T00:18:18Z
    date copyrightJanuary, 2005
    date issued2005
    identifier issn0889-504X
    identifier otherJOTUEI-28717#222_1.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/132855
    description abstractThe paper reports an experimental study of impingement cooling in a rotating passage of semi-cylindrical cross section. Cooling fluid is injected from a row of five jet holes along the centerline of the flat surface of the passage and strikes the concave surface. The cooling passage rotates orthogonally about an axis parallel to that of the jets. Tests have been carried out, using water, both within the passage and as the jet fluid, at a fixed Reynolds number of 15,000, for clockwise and counter-clockwise rotation. Local Nusselt number measurements, using the liquid-crystal technique, show that under stationary conditions a high Nusselt number region develops around each impingement point, with secondary peaks half-way between impingement points. Rotation reduces heat transfer, leads to the disappearance of all secondary peaks and also, surprisingly, of some of the primary peaks. Flow visualization tests suggest that these changes in thermal behavior are caused because rotation increases the spreading rate of the jets. LDA and PIV measurements are also presented. They show that under stationary conditions the five jets exhibit a similar behavior, with their cores remaining intact up to the point of impingement at the top dead center. The LDA and PIV studies help explain the rather surprising thermal behavior under rotating conditions.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleExperimental Study of the Flow and Thermal Development of a Row of Cooling Jets Impinging on a Rotating Concave Surface
    typeJournal Paper
    journal volume127
    journal issue1
    journal titleJournal of Turbomachinery
    identifier doi10.1115/1.1812778
    journal fristpage222
    journal lastpage229
    identifier eissn1528-8900
    keywordsRotation
    keywordsFlow (Dynamics)
    keywordsHeat transfer
    keywordsCooling
    keywordsMeasurement
    keywordsJets
    keywordsFlow visualization
    keywordsFluids AND Impingement cooling
    treeJournal of Turbomachinery:;2005:;volume( 127 ):;issue: 001
    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