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    An Appraisal of System Mean Void Fraction and Its Application for the Moving Boundary Simulation of Phase Change Heat Exchangers

    Source: Journal of Heat Transfer:;2015:;volume( 137 ):;issue: 012::page 121015
    Author:
    Datta, S. P.
    ,
    Chandra, R. K.
    ,
    Das, P. K.
    DOI: 10.1115/1.4030964
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: In gas–liquid twophase flow, void fraction is the most unique parameter which influences all the transport processes. In the most general case, though the void fraction varies nonlinearly with the channel length, many practical simulations make use of the “system mean void fraction.â€‌ The present investigation makes a critical assessment of different system mean void fraction models for a wide range of slip velocity and density difference between the phases. To this end, different correlations for slip ratio have been considered and, for all the cases, closed form expression for the system mean void fraction has been presented. The local as well as the system mean void fractions have also been estimated numerically from a heat transfer based model. Predictions from the heat transfer based model and the slip ratio based model have been compared. As an application, the slip ratio based system mean void fraction is used in to build the moving boundary model for phasechange heat exchangers. The prediction of startup transients for both an evaporator and a condenser of an automotive air conditioning system (AACS) agrees well with the experimental results.
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      An Appraisal of System Mean Void Fraction and Its Application for the Moving Boundary Simulation of Phase Change Heat Exchangers

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    http://yetl.yabesh.ir/yetl1/handle/yetl/158608
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    contributor authorDatta, S. P.
    contributor authorChandra, R. K.
    contributor authorDas, P. K.
    date accessioned2017-05-09T01:20:06Z
    date available2017-05-09T01:20:06Z
    date issued2015
    identifier issn0022-1481
    identifier otherht_137_12_121015.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/158608
    description abstractIn gas–liquid twophase flow, void fraction is the most unique parameter which influences all the transport processes. In the most general case, though the void fraction varies nonlinearly with the channel length, many practical simulations make use of the “system mean void fraction.â€‌ The present investigation makes a critical assessment of different system mean void fraction models for a wide range of slip velocity and density difference between the phases. To this end, different correlations for slip ratio have been considered and, for all the cases, closed form expression for the system mean void fraction has been presented. The local as well as the system mean void fractions have also been estimated numerically from a heat transfer based model. Predictions from the heat transfer based model and the slip ratio based model have been compared. As an application, the slip ratio based system mean void fraction is used in to build the moving boundary model for phasechange heat exchangers. The prediction of startup transients for both an evaporator and a condenser of an automotive air conditioning system (AACS) agrees well with the experimental results.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleAn Appraisal of System Mean Void Fraction and Its Application for the Moving Boundary Simulation of Phase Change Heat Exchangers
    typeJournal Paper
    journal volume137
    journal issue12
    journal titleJournal of Heat Transfer
    identifier doi10.1115/1.4030964
    journal fristpage121015
    journal lastpage121015
    identifier eissn1528-8943
    treeJournal of Heat Transfer:;2015:;volume( 137 ):;issue: 012
    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
    yabeshDSpacePersian