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    A Model of Transient Heat and Mass Transfer in a Heterogeneous Medium of Ceria Undergoing Nonstoichiometric Reduction

    Source: Journal of Heat Transfer:;2013:;volume( 135 ):;issue: 005::page 52701
    Author:
    Keene, Daniel J.
    ,
    Davidson, Jane H.
    ,
    Lipi„ski, Wojciech
    DOI: 10.1115/1.4023494
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: The redox chemistry of nonstoichiometric metal oxides can be used to produce chemical fuels by harnessing concentrated solar energy to split water and/or carbon dioxide. In such a process, it is desirable to use a porous reactive substrate for increased surface area and improved gas transport. The present study develops a macroscopicscale model of porous ceria undergoing thermal reduction. The model captures the coupled interactions between the heat and mass transfer and the heterogeneous chemistry using a local thermal nonequilibrium (LTNE) formulation of the volumeaveraged conservation of mass and energy equations in an axisymmetric cylindrical domain. The results of a representative test case simulation demonstrate strong coupling between gas phase mass transfer and the chemical kinetics as well as the pronounced impact of optical thickness on the temperature distribution and thus global solartochemical energy conversion.
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      A Model of Transient Heat and Mass Transfer in a Heterogeneous Medium of Ceria Undergoing Nonstoichiometric Reduction

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    http://yetl.yabesh.ir/yetl1/handle/yetl/152117
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    contributor authorKeene, Daniel J.
    contributor authorDavidson, Jane H.
    contributor authorLipi„ski, Wojciech
    date accessioned2017-05-09T00:59:44Z
    date available2017-05-09T00:59:44Z
    date issued2013
    identifier issn0022-1481
    identifier otherht_135_5_052701.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/152117
    description abstractThe redox chemistry of nonstoichiometric metal oxides can be used to produce chemical fuels by harnessing concentrated solar energy to split water and/or carbon dioxide. In such a process, it is desirable to use a porous reactive substrate for increased surface area and improved gas transport. The present study develops a macroscopicscale model of porous ceria undergoing thermal reduction. The model captures the coupled interactions between the heat and mass transfer and the heterogeneous chemistry using a local thermal nonequilibrium (LTNE) formulation of the volumeaveraged conservation of mass and energy equations in an axisymmetric cylindrical domain. The results of a representative test case simulation demonstrate strong coupling between gas phase mass transfer and the chemical kinetics as well as the pronounced impact of optical thickness on the temperature distribution and thus global solartochemical energy conversion.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleA Model of Transient Heat and Mass Transfer in a Heterogeneous Medium of Ceria Undergoing Nonstoichiometric Reduction
    typeJournal Paper
    journal volume135
    journal issue5
    journal titleJournal of Heat Transfer
    identifier doi10.1115/1.4023494
    journal fristpage52701
    journal lastpage52701
    identifier eissn1528-8943
    treeJournal of Heat Transfer:;2013:;volume( 135 ):;issue: 005
    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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