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    Effect of Surface Curvature on Heat Transfer and Hydrodynamics Within a Single Hemispherical Dimple

    Source: Journal of Turbomachinery:;2001:;volume( 123 ):;issue: 003::page 609
    Author:
    N. Syred
    ,
    A. Kozlov
    ,
    A. Shchukin
    ,
    R. Agachev
    ,
    A. Khalatov
    DOI: 10.1115/1.1348020
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: Turbulent heat transfer and hydrodynamics have been studied in concavely and convexly curved dimples with Reynolds numbers ranging from 1.3×105 to 3.1×105. The large-scale single hemispherical dimple 50 mm in diameter and 25 mm in depth was arranged on the smooth concave or convex wall of a curved rectangular-shaped passage. The fluid flow and heat transfer measurements, and surface streamline observations were performed within the flow curvature parameter δ**/R ranged from 0.002 to 0.007. The “tornado-like” oscillating vortex bursting periodically out of the dimple was registered in the experiments with a “curved” dimple. This vortex structure is similar to that earlier observed in a “flat” dimple. The surface curvature considerably influences the dimple heat transfer rate in both cases. It enhances heat transfer in a “concave” dimple and reduces it in a “convex” one; however, the more remarkable effect occurred in a concavely curved dimple. The correction factors describing the effect of curvature on average heat transfer in a “curved” dimple have been obtained as a result of experimental study.
    keyword(s): Hydrodynamics , Heat transfer , Reynolds number , Flow (Dynamics) AND Measurement ,
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      Effect of Surface Curvature on Heat Transfer and Hydrodynamics Within a Single Hemispherical Dimple

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    http://yetl.yabesh.ir/yetl1/handle/yetl/126036
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    contributor authorN. Syred
    contributor authorA. Kozlov
    contributor authorA. Shchukin
    contributor authorR. Agachev
    contributor authorA. Khalatov
    date accessioned2017-05-09T00:06:16Z
    date available2017-05-09T00:06:16Z
    date copyrightJuly, 2001
    date issued2001
    identifier issn0889-504X
    identifier otherJOTUEI-28689#609_1.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/126036
    description abstractTurbulent heat transfer and hydrodynamics have been studied in concavely and convexly curved dimples with Reynolds numbers ranging from 1.3×105 to 3.1×105. The large-scale single hemispherical dimple 50 mm in diameter and 25 mm in depth was arranged on the smooth concave or convex wall of a curved rectangular-shaped passage. The fluid flow and heat transfer measurements, and surface streamline observations were performed within the flow curvature parameter δ**/R ranged from 0.002 to 0.007. The “tornado-like” oscillating vortex bursting periodically out of the dimple was registered in the experiments with a “curved” dimple. This vortex structure is similar to that earlier observed in a “flat” dimple. The surface curvature considerably influences the dimple heat transfer rate in both cases. It enhances heat transfer in a “concave” dimple and reduces it in a “convex” one; however, the more remarkable effect occurred in a concavely curved dimple. The correction factors describing the effect of curvature on average heat transfer in a “curved” dimple have been obtained as a result of experimental study.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleEffect of Surface Curvature on Heat Transfer and Hydrodynamics Within a Single Hemispherical Dimple
    typeJournal Paper
    journal volume123
    journal issue3
    journal titleJournal of Turbomachinery
    identifier doi10.1115/1.1348020
    journal fristpage609
    journal lastpage613
    identifier eissn1528-8900
    keywordsHydrodynamics
    keywordsHeat transfer
    keywordsReynolds number
    keywordsFlow (Dynamics) AND Measurement
    treeJournal of Turbomachinery:;2001:;volume( 123 ):;issue: 003
    contenttypeFulltext
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