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    Heat Transfer Enhancement of Horizontal Oscillating Heat Pipes With Micro-/Nanostructured Surface

    Source: Journal of Heat Transfer:;2020:;volume( 142 ):;issue: 007::page 072001-1
    Author:
    Hao, Tingting
    ,
    Yu, Huiwen
    ,
    Ma, Xuehu
    ,
    Lan, Zhong
    DOI: 10.1115/1.4047216
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: For oscillating heat pipes (OHPs) with low turn number (<9) positioned in the horizontal direction, the working fluid could not easily flow back to the evaporator due to the absence of gravity. Based on this, copper OHP with superhydrophilic micro-/nanostructured surface was investigated to enhance the heat transfer performance by introducing additional capillary force. OHPs with six turns were fabricated with bare copper and micro-/nanostructured inner surfaces for comparison. Pure water was used as the working fluid. Contact angles of water on the copper and superhydrophilic surfaces were 36.7 and 0 deg, respectively. The filling ratios of water were 50%, 65%, and 80%, respectively. Thermal resistance and liquid slug oscillations of OHPs were investigated at the heat input ranging from 100 to 380 W. Experimental results showed that OHPs with the superhydrophilic micro-/nanostructured surface showed an enhanced heat transfer performance due to the micro-/nanostructure-induced capillary flow in the horizontal direction. The optimum filling ratio was 65% in this work. The superhydrophilic micro-/nanostructured surface could significantly facilitate the backflow of the working fluid to the evaporator section and accelerate oscillating motions of liquid slugs. With the increasing of 0–70% in slug oscillating amplitude and 0–100% in slug oscillating velocity, micro-/nanostructured OHPs improved the heat transfer performance by up to 10% compared with the copper OHPs due to the wicking effect.
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      Heat Transfer Enhancement of Horizontal Oscillating Heat Pipes With Micro-/Nanostructured Surface

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4274749
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    contributor authorHao, Tingting
    contributor authorYu, Huiwen
    contributor authorMa, Xuehu
    contributor authorLan, Zhong
    date accessioned2022-02-04T22:02:08Z
    date available2022-02-04T22:02:08Z
    date copyright5/29/2020 12:00:00 AM
    date issued2020
    identifier issn0022-1481
    identifier otherht_142_07_072001.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4274749
    description abstractFor oscillating heat pipes (OHPs) with low turn number (<9) positioned in the horizontal direction, the working fluid could not easily flow back to the evaporator due to the absence of gravity. Based on this, copper OHP with superhydrophilic micro-/nanostructured surface was investigated to enhance the heat transfer performance by introducing additional capillary force. OHPs with six turns were fabricated with bare copper and micro-/nanostructured inner surfaces for comparison. Pure water was used as the working fluid. Contact angles of water on the copper and superhydrophilic surfaces were 36.7 and 0 deg, respectively. The filling ratios of water were 50%, 65%, and 80%, respectively. Thermal resistance and liquid slug oscillations of OHPs were investigated at the heat input ranging from 100 to 380 W. Experimental results showed that OHPs with the superhydrophilic micro-/nanostructured surface showed an enhanced heat transfer performance due to the micro-/nanostructure-induced capillary flow in the horizontal direction. The optimum filling ratio was 65% in this work. The superhydrophilic micro-/nanostructured surface could significantly facilitate the backflow of the working fluid to the evaporator section and accelerate oscillating motions of liquid slugs. With the increasing of 0–70% in slug oscillating amplitude and 0–100% in slug oscillating velocity, micro-/nanostructured OHPs improved the heat transfer performance by up to 10% compared with the copper OHPs due to the wicking effect.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleHeat Transfer Enhancement of Horizontal Oscillating Heat Pipes With Micro-/Nanostructured Surface
    typeJournal Paper
    journal volume142
    journal issue7
    journal titleJournal of Heat Transfer
    identifier doi10.1115/1.4047216
    journal fristpage072001-1
    journal lastpage072001-8
    page8
    treeJournal of Heat Transfer:;2020:;volume( 142 ):;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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