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    On the Mechanism of Pool Boiling Critical Heat Flux Enhancement in Nanofluids

    Source: Journal of Heat Transfer:;2010:;volume( 132 ):;issue: 006::page 61501
    Author:
    Hyungdae Kim
    ,
    Ho Seon Ahn
    ,
    Moo Hwan Kim
    DOI: 10.1115/1.4000746
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: The pool boiling characteristics of water-based nanofluids with alumina and titania nanoparticles of 0.01 vol % were investigated on a thermally heated disk heater at saturated temperature and atmospheric pressure. The results confirmed the findings of previous studies that nanofluids can significantly enhance the critical heat flux (CHF), resulting in a large increase in the wall superheat. It was found that some nanoparticles deposit on the heater surface during nucleate boiling, and the surface modification due to the deposition results in the same magnitude of CHF enhancement in pure water as for nanofluids. Subsequent to the boiling experiments, the interfacial properties of the heater surfaces were examined using dynamic wetting of an evaporating water droplet. As the surface temperature increased, the evaporating meniscus on the clean surface suddenly receded toward the liquid due to the evaporation recoil force on the liquid-vapor interface, but the nanoparticle-fouled surface exhibited stable wetting of the liquid meniscus even at a remarkably higher wall superheat. The heat flux gain attainable due to the improved wetting of the evaporating meniscus on the fouled surface showed good agreement with the CHF enhancement during nanofluid boiling. It is supposed that the nanoparticle layer increases the stability of the evaporating microlayer underneath a bubble growing on a heated surface and thus the irreversible growth of a hot/dry spot is inhibited even at a high wall superheat, resulting in the CHF enhancement observed when boiling nanofluids.
    keyword(s): Nanoparticles , Boiling , Evaporation , Nanofluids , Pool boiling , Water , Critical heat flux , Wetting (Surface science) AND Mechanisms ,
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      On the Mechanism of Pool Boiling Critical Heat Flux Enhancement in Nanofluids

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    http://yetl.yabesh.ir/yetl1/handle/yetl/143839
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    contributor authorHyungdae Kim
    contributor authorHo Seon Ahn
    contributor authorMoo Hwan Kim
    date accessioned2017-05-09T00:38:56Z
    date available2017-05-09T00:38:56Z
    date copyrightJune, 2010
    date issued2010
    identifier issn0022-1481
    identifier otherJHTRAO-27889#061501_1.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/143839
    description abstractThe pool boiling characteristics of water-based nanofluids with alumina and titania nanoparticles of 0.01 vol % were investigated on a thermally heated disk heater at saturated temperature and atmospheric pressure. The results confirmed the findings of previous studies that nanofluids can significantly enhance the critical heat flux (CHF), resulting in a large increase in the wall superheat. It was found that some nanoparticles deposit on the heater surface during nucleate boiling, and the surface modification due to the deposition results in the same magnitude of CHF enhancement in pure water as for nanofluids. Subsequent to the boiling experiments, the interfacial properties of the heater surfaces were examined using dynamic wetting of an evaporating water droplet. As the surface temperature increased, the evaporating meniscus on the clean surface suddenly receded toward the liquid due to the evaporation recoil force on the liquid-vapor interface, but the nanoparticle-fouled surface exhibited stable wetting of the liquid meniscus even at a remarkably higher wall superheat. The heat flux gain attainable due to the improved wetting of the evaporating meniscus on the fouled surface showed good agreement with the CHF enhancement during nanofluid boiling. It is supposed that the nanoparticle layer increases the stability of the evaporating microlayer underneath a bubble growing on a heated surface and thus the irreversible growth of a hot/dry spot is inhibited even at a high wall superheat, resulting in the CHF enhancement observed when boiling nanofluids.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleOn the Mechanism of Pool Boiling Critical Heat Flux Enhancement in Nanofluids
    typeJournal Paper
    journal volume132
    journal issue6
    journal titleJournal of Heat Transfer
    identifier doi10.1115/1.4000746
    journal fristpage61501
    identifier eissn1528-8943
    keywordsNanoparticles
    keywordsBoiling
    keywordsEvaporation
    keywordsNanofluids
    keywordsPool boiling
    keywordsWater
    keywordsCritical heat flux
    keywordsWetting (Surface science) AND Mechanisms
    treeJournal of Heat Transfer:;2010:;volume( 132 ):;issue: 006
    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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