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    Heat Transfer in a Two-Pass Rectangular Channel (AR=1:4) Under High Rotation Numbers

    Source: Journal of Heat Transfer:;2008:;volume( 130 ):;issue: 008::page 81701
    Author:
    Yao-Hsien Liu
    ,
    Sanjay Chopra
    ,
    Michael Huh
    ,
    Je-Chin Han
    DOI: 10.1115/1.2909615
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: This paper experimentally investigated the rotational effects on heat transfer in a two-pass rectangular channel (AR=1:4), which is applicable to the channel near the leading edge of the gas turbine blade. The test channel has radially outward flow in the first passage through a redirected sharp-bend entrance and radially inward flow in the second passage after a 180deg sharp turn. In the first passage, rotation effects on heat transfer are reduced by the redirected sharp-bend entrance. In the second passage, under rotating conditions, both leading and trailing surfaces experienced heat transfer enhancements above the stationary case. Rotation greatly increased heat transfer enhancement in the tip region up to a maximum Nu ratio (Nu∕Nus) of 2.4. The objective of the current study is to perform an extended parametric study of the low rotation number (0–0.3) and low buoyancy parameter (0–0.2) achieved previously. By varying the Reynolds numbers (10,000–40,000), the rotational speeds (0–400rpm), and the density ratios (inlet density ratio=0.10–0.16), the increased range of the rotation number and buoyancy parameter reached in this study are 0–0.67 and 0–2.0, respectively. The higher rotation number and buoyancy parameter have been correlated very well to predict the rotational heat transfer in the two-pass, 1:4 aspect ratio flow channel.
    keyword(s): Rotation , Flow (Dynamics) , Buoyancy , Heat transfer , Channels (Hydraulic engineering) AND Reynolds number ,
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      Heat Transfer in a Two-Pass Rectangular Channel (AR=1:4) Under High Rotation Numbers

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    http://yetl.yabesh.ir/yetl1/handle/yetl/138497
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    contributor authorYao-Hsien Liu
    contributor authorSanjay Chopra
    contributor authorMichael Huh
    contributor authorJe-Chin Han
    date accessioned2017-05-09T00:28:59Z
    date available2017-05-09T00:28:59Z
    date copyrightAugust, 2008
    date issued2008
    identifier issn0022-1481
    identifier otherJHTRAO-27841#081701_1.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/138497
    description abstractThis paper experimentally investigated the rotational effects on heat transfer in a two-pass rectangular channel (AR=1:4), which is applicable to the channel near the leading edge of the gas turbine blade. The test channel has radially outward flow in the first passage through a redirected sharp-bend entrance and radially inward flow in the second passage after a 180deg sharp turn. In the first passage, rotation effects on heat transfer are reduced by the redirected sharp-bend entrance. In the second passage, under rotating conditions, both leading and trailing surfaces experienced heat transfer enhancements above the stationary case. Rotation greatly increased heat transfer enhancement in the tip region up to a maximum Nu ratio (Nu∕Nus) of 2.4. The objective of the current study is to perform an extended parametric study of the low rotation number (0–0.3) and low buoyancy parameter (0–0.2) achieved previously. By varying the Reynolds numbers (10,000–40,000), the rotational speeds (0–400rpm), and the density ratios (inlet density ratio=0.10–0.16), the increased range of the rotation number and buoyancy parameter reached in this study are 0–0.67 and 0–2.0, respectively. The higher rotation number and buoyancy parameter have been correlated very well to predict the rotational heat transfer in the two-pass, 1:4 aspect ratio flow channel.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleHeat Transfer in a Two-Pass Rectangular Channel (AR=1:4) Under High Rotation Numbers
    typeJournal Paper
    journal volume130
    journal issue8
    journal titleJournal of Heat Transfer
    identifier doi10.1115/1.2909615
    journal fristpage81701
    identifier eissn1528-8943
    keywordsRotation
    keywordsFlow (Dynamics)
    keywordsBuoyancy
    keywordsHeat transfer
    keywordsChannels (Hydraulic engineering) AND Reynolds number
    treeJournal of Heat Transfer:;2008:;volume( 130 ):;issue: 008
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
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