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    Experimental and Numerical Investigations on the Heat Transfer of Film Cooling With Cylindrical Holes Fed With Internal Coolant Cross Flows

    Source: Journal of Heat Transfer:;2020:;volume( 142 ):;issue: 005
    Author:
    Ye, Lin
    ,
    Liu, Cun-Liang
    ,
    Zhou, Dao-En
    ,
    Zhu, Hui-Ren
    DOI: 10.1115/1.4046441
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: The heat transfer coefficient of cylindrical holes fed by varying internal cross-flow channels with different cross-flow Reynolds numbers Rec is experimentally studied on a low-speed flat-plate facility. Three coolant cross flow cases, including a smooth case and two ribbed cases with 45/135-deg ribs, are studied at Rec = 50,000, and 100,000 with varying blowing ratios M of 0.5, 1.0, and 2.0. A transient liquid-crystal (LC) measurement technique is used to determine the heat transfer coefficient. At lower M, the heat transfer enhancement regions are asymmetrical for the smooth and 45-deg cases. The asymmetrical vortex is more pronounced with increasing cross-flow direction velocity, resulting in a more skewed distribution at Rec = 100,000. Conversely, the contours are laterally symmetric in the 135-deg case at varying Rec. A fork-shaped trend with a relatively high heat transfer coefficient appears upstream, and the increases in the heat transfer in the 135-deg cases are lower than those in the 45-deg cases. As M increases to 2.0, the vortex intensity increases, resulting in a stronger scouring effect upstream, especially at large Rec. The range and degree are affected by Rec at M = 2.0. The core of the heat transfer enhancement is skewed to the −Y side for both cases.
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      Experimental and Numerical Investigations on the Heat Transfer of Film Cooling With Cylindrical Holes Fed With Internal Coolant Cross Flows

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    contributor authorYe, Lin
    contributor authorLiu, Cun-Liang
    contributor authorZhou, Dao-En
    contributor authorZhu, Hui-Ren
    date accessioned2022-02-04T14:50:48Z
    date available2022-02-04T14:50:48Z
    date copyright2020/03/17/
    date issued2020
    identifier issn0022-1481
    identifier otherht_142_05_052302.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4274505
    description abstractThe heat transfer coefficient of cylindrical holes fed by varying internal cross-flow channels with different cross-flow Reynolds numbers Rec is experimentally studied on a low-speed flat-plate facility. Three coolant cross flow cases, including a smooth case and two ribbed cases with 45/135-deg ribs, are studied at Rec = 50,000, and 100,000 with varying blowing ratios M of 0.5, 1.0, and 2.0. A transient liquid-crystal (LC) measurement technique is used to determine the heat transfer coefficient. At lower M, the heat transfer enhancement regions are asymmetrical for the smooth and 45-deg cases. The asymmetrical vortex is more pronounced with increasing cross-flow direction velocity, resulting in a more skewed distribution at Rec = 100,000. Conversely, the contours are laterally symmetric in the 135-deg case at varying Rec. A fork-shaped trend with a relatively high heat transfer coefficient appears upstream, and the increases in the heat transfer in the 135-deg cases are lower than those in the 45-deg cases. As M increases to 2.0, the vortex intensity increases, resulting in a stronger scouring effect upstream, especially at large Rec. The range and degree are affected by Rec at M = 2.0. The core of the heat transfer enhancement is skewed to the −Y side for both cases.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleExperimental and Numerical Investigations on the Heat Transfer of Film Cooling With Cylindrical Holes Fed With Internal Coolant Cross Flows
    typeJournal Paper
    journal volume142
    journal issue5
    journal titleJournal of Heat Transfer
    identifier doi10.1115/1.4046441
    page52302
    treeJournal of Heat Transfer:;2020:;volume( 142 ):;issue: 005
    contenttypeFulltext
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