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    Convex Turbulent Boundary Layers With Zero and Favorable Pressure Gradients

    Source: Journal of Fluids Engineering:;1996:;volume( 118 ):;issue: 004::page 787
    Author:
    A. C. Schwarz
    ,
    M. W. Plesniak
    DOI: 10.1115/1.2835510
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: A turbulent boundary layer subjected to multiple, additional strain rates, namely convex curvature coupled with streamwise pressure gradients (zero and favorable, ZPG and FPG) was investigated experimentally using laser Doppler velocimetry. The inapplicability of the universal flat-plate log-law to curved flows is discussed. However, a logarithmic region is found in the curved and accelerated turbulent boundary layer examined here. Similarity of the mean velocity and Reynolds stress profiles was achieved by 45 deg of curvature even in the presence of the strongest FPG investigated (k = 1.01 × 10−6 ). The Reynolds stresses were suppressed (with respect to flat plate values) due primarily to the effects of strong convex curvature (δo /R ≈ 0.10). In curved boundary layers subjected to different favorable pressure gradients, the mean velocity and normal Reynolds stress profiles collapsed in the inner region, but deviated in the outer region (y+ ≥ 100). Thus, inner scaling accounted for the impact of the extra strain rates on these profiles in the near-wall region. Combined with curvature, the FPG reduced the strength of the wake component, resulted in a greater suppression of the fluctuating velocity components and a reduction of the primary Reynolds shear stress throughout almost the entire boundary layer relative to the ZPG curved case.
    keyword(s): Boundary layer turbulence , Pressure gradient , Stress , Boundary layers , Flat plates , Laser Doppler anemometry , Flow (Dynamics) , Shear (Mechanics) AND Wakes ,
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      Convex Turbulent Boundary Layers With Zero and Favorable Pressure Gradients

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    http://yetl.yabesh.ir/yetl1/handle/yetl/117116
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    contributor authorA. C. Schwarz
    contributor authorM. W. Plesniak
    date accessioned2017-05-08T23:50:28Z
    date available2017-05-08T23:50:28Z
    date copyrightDecember, 1996
    date issued1996
    identifier issn0098-2202
    identifier otherJFEGA4-27110#787_1.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/117116
    description abstractA turbulent boundary layer subjected to multiple, additional strain rates, namely convex curvature coupled with streamwise pressure gradients (zero and favorable, ZPG and FPG) was investigated experimentally using laser Doppler velocimetry. The inapplicability of the universal flat-plate log-law to curved flows is discussed. However, a logarithmic region is found in the curved and accelerated turbulent boundary layer examined here. Similarity of the mean velocity and Reynolds stress profiles was achieved by 45 deg of curvature even in the presence of the strongest FPG investigated (k = 1.01 × 10−6 ). The Reynolds stresses were suppressed (with respect to flat plate values) due primarily to the effects of strong convex curvature (δo /R ≈ 0.10). In curved boundary layers subjected to different favorable pressure gradients, the mean velocity and normal Reynolds stress profiles collapsed in the inner region, but deviated in the outer region (y+ ≥ 100). Thus, inner scaling accounted for the impact of the extra strain rates on these profiles in the near-wall region. Combined with curvature, the FPG reduced the strength of the wake component, resulted in a greater suppression of the fluctuating velocity components and a reduction of the primary Reynolds shear stress throughout almost the entire boundary layer relative to the ZPG curved case.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleConvex Turbulent Boundary Layers With Zero and Favorable Pressure Gradients
    typeJournal Paper
    journal volume118
    journal issue4
    journal titleJournal of Fluids Engineering
    identifier doi10.1115/1.2835510
    journal fristpage787
    journal lastpage794
    identifier eissn1528-901X
    keywordsBoundary layer turbulence
    keywordsPressure gradient
    keywordsStress
    keywordsBoundary layers
    keywordsFlat plates
    keywordsLaser Doppler anemometry
    keywordsFlow (Dynamics)
    keywordsShear (Mechanics) AND Wakes
    treeJournal of Fluids Engineering:;1996:;volume( 118 ):;issue: 004
    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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