YaBeSH Engineering and Technology Library

    • Journals
    • PaperQuest
    • YSE Standards
    • YaBeSH
    • Login
    View Item 
    •   YE&T Library
    • ASME
    • Journal of Heat Transfer
    • View Item
    •   YE&T Library
    • ASME
    • Journal of Heat Transfer
    • View Item
    • All Fields
    • Source Title
    • Year
    • Publisher
    • Title
    • Subject
    • Author
    • DOI
    • ISBN
    Advanced Search
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Archive

    Condensation in Microchannels: Detailed Comparisons of Annular Laminar Flow Theory With Measurements

    Source: Journal of Heat Transfer:;2017:;volume( 139 ):;issue: 007::page 72403
    Author:
    Sheng Wang, Hua
    ,
    Rose, John W.
    DOI: 10.1115/1.4036082
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: A relatively simple theory of annular laminar film condensation in microchannels, based on the Nusselt approximations for the condensate film and a theoretically based approximation for the vapor shear stress, has no empirical input and gives the local heat transfer coefficient and local quality for given vapor mass flux and vapor–surface temperature difference distribution along the channel. As well as streamwise vapor shear stress and gravity, the theory includes transverse (to the flow direction) surface tension-driven motion of the condensate film and gives a differential equation for the local (transverse and streamwise) condensate film thickness. As well as four transverse direction boundary conditions due to condensate surface curvature, a streamwise boundary condition is required as in the Nusselt theory. When the vapor is saturated or superheated at inlet, this is provided by the fact that the film thickness is zero around the channel perimeter at the position of onset on condensation. Most experimental investigations have been conducted with quality less than one at inlet and only approximate comparisons, discussed in earlier papers, can be made. The present paper is devoted to comparisons between theory and measurements in investigations where local heat flux and channel surface temperature were measured and the vapor at inlet was superheated. Measured and calculated heat transfer coefficients and their dependence on distance along the channel and on local quality are in surprisingly good agreement and suggest that the mode of condensation is, in fact, annular and laminar, at least where the quality is high.
    • Download: (1.320Mb)
    • Show Full MetaData Hide Full MetaData
    • Get RIS
    • Item Order
    • Go To Publisher
    • Price: 5000 Rial
    • Statistics

      Condensation in Microchannels: Detailed Comparisons of Annular Laminar Flow Theory With Measurements

    URI
    http://yetl.yabesh.ir/yetl1/handle/yetl/4234274
    Collections
    • Journal of Heat Transfer

    Show full item record

    contributor authorSheng Wang, Hua
    contributor authorRose, John W.
    date accessioned2017-11-25T07:16:53Z
    date available2017-11-25T07:16:53Z
    date copyright2017/4/4
    date issued2017
    identifier issn0022-1481
    identifier otherht_139_07_072403.pdf
    identifier urihttp://138.201.223.254:8080/yetl1/handle/yetl/4234274
    description abstractA relatively simple theory of annular laminar film condensation in microchannels, based on the Nusselt approximations for the condensate film and a theoretically based approximation for the vapor shear stress, has no empirical input and gives the local heat transfer coefficient and local quality for given vapor mass flux and vapor–surface temperature difference distribution along the channel. As well as streamwise vapor shear stress and gravity, the theory includes transverse (to the flow direction) surface tension-driven motion of the condensate film and gives a differential equation for the local (transverse and streamwise) condensate film thickness. As well as four transverse direction boundary conditions due to condensate surface curvature, a streamwise boundary condition is required as in the Nusselt theory. When the vapor is saturated or superheated at inlet, this is provided by the fact that the film thickness is zero around the channel perimeter at the position of onset on condensation. Most experimental investigations have been conducted with quality less than one at inlet and only approximate comparisons, discussed in earlier papers, can be made. The present paper is devoted to comparisons between theory and measurements in investigations where local heat flux and channel surface temperature were measured and the vapor at inlet was superheated. Measured and calculated heat transfer coefficients and their dependence on distance along the channel and on local quality are in surprisingly good agreement and suggest that the mode of condensation is, in fact, annular and laminar, at least where the quality is high.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleCondensation in Microchannels: Detailed Comparisons of Annular Laminar Flow Theory With Measurements
    typeJournal Paper
    journal volume139
    journal issue7
    journal titleJournal of Heat Transfer
    identifier doi10.1115/1.4036082
    journal fristpage72403
    journal lastpage072403-6
    treeJournal of Heat Transfer:;2017:;volume( 139 ):;issue: 007
    contenttypeFulltext
    DSpace software copyright © 2002-2015  DuraSpace
    نرم افزار کتابخانه دیجیتال "دی اسپیس" فارسی شده توسط یابش برای کتابخانه های ایرانی | تماس با یابش
    yabeshDSpacePersian
     
    DSpace software copyright © 2002-2015  DuraSpace
    نرم افزار کتابخانه دیجیتال "دی اسپیس" فارسی شده توسط یابش برای کتابخانه های ایرانی | تماس با یابش
    yabeshDSpacePersian