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    Heat Transfer Coefficient Distribution of W and Broken W Turbulators at High Reynolds Numbers

    Source: Journal of Thermal Science and Engineering Applications:;2021:;volume( 014 ):;issue: 007::page 71005-1
    Author:
    Ghazi-Hesami, Sam
    ,
    Wise, Dylan
    ,
    Taylor, Keith
    ,
    Robert, Étienne
    ,
    Ireland, Peter
    DOI: 10.1115/1.4052350
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: An experimental and numerical study of the convective heat transfer enhancement provided by two rib families (W and Broken W) is presented, covering Reynolds numbers (Re) between 300,000 and 900,000 in a straight channel with a rectangular cross section (AR = 1.29). These high Reynolds numbers were selected for the current study since most data in the available literature typically pertain to investigations at lower Reynolds numbers. The objective of this study is to assess the local heat transfer coefficient (HTC) enhancement (compared with a smooth channel) and the overall thermal performance, taking into account the effect of increased roughness on the friction factor, of a group of W-shaped turbulators over a wide range of Reynolds numbers. Furthermore, the effects of increasing the rib spacing on the thermal performance of the Broken W configuration are presented and discussed. The numerical results are compared against heat transfer measurements obtained using the transient liquid crystal (TLC) method. The research shows that for the Broken W turbulators, increasing the Reynolds number is associated with an overall decrease of the thermal performance while the thermal performance of the W configuration is relatively insensitive to Reynolds number. Nevertheless, the Broken W configuration delivers higher thermal performance and heat transfer compared with the W configuration for the range of Re investigated. The Broken W configuration with a pitch spacing of 10 times the rib height was shown to provide the optimal thermal performance in the configurations investigated here.
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      Heat Transfer Coefficient Distribution of W and Broken W Turbulators at High Reynolds Numbers

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    contributor authorGhazi-Hesami, Sam
    contributor authorWise, Dylan
    contributor authorTaylor, Keith
    contributor authorRobert, Étienne
    contributor authorIreland, Peter
    date accessioned2022-05-08T08:51:06Z
    date available2022-05-08T08:51:06Z
    date copyright10/18/2021 12:00:00 AM
    date issued2021
    identifier issn1948-5085
    identifier othertsea_14_7_071005.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4284421
    description abstractAn experimental and numerical study of the convective heat transfer enhancement provided by two rib families (W and Broken W) is presented, covering Reynolds numbers (Re) between 300,000 and 900,000 in a straight channel with a rectangular cross section (AR = 1.29). These high Reynolds numbers were selected for the current study since most data in the available literature typically pertain to investigations at lower Reynolds numbers. The objective of this study is to assess the local heat transfer coefficient (HTC) enhancement (compared with a smooth channel) and the overall thermal performance, taking into account the effect of increased roughness on the friction factor, of a group of W-shaped turbulators over a wide range of Reynolds numbers. Furthermore, the effects of increasing the rib spacing on the thermal performance of the Broken W configuration are presented and discussed. The numerical results are compared against heat transfer measurements obtained using the transient liquid crystal (TLC) method. The research shows that for the Broken W turbulators, increasing the Reynolds number is associated with an overall decrease of the thermal performance while the thermal performance of the W configuration is relatively insensitive to Reynolds number. Nevertheless, the Broken W configuration delivers higher thermal performance and heat transfer compared with the W configuration for the range of Re investigated. The Broken W configuration with a pitch spacing of 10 times the rib height was shown to provide the optimal thermal performance in the configurations investigated here.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleHeat Transfer Coefficient Distribution of W and Broken W Turbulators at High Reynolds Numbers
    typeJournal Paper
    journal volume14
    journal issue7
    journal titleJournal of Thermal Science and Engineering Applications
    identifier doi10.1115/1.4052350
    journal fristpage71005-1
    journal lastpage71005-14
    page14
    treeJournal of Thermal Science and Engineering Applications:;2021:;volume( 014 ):;issue: 007
    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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