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    Flow Regimes for Laminar Film Condensation on a Vertical Plate With an Upward Vapor Flow

    Source: Journal of Heat Transfer:;2020:;volume( 142 ):;issue: 004
    Author:
    Kanatani, Kentaro
    DOI: 10.1115/1.4046307
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: Laminar film condensation on a vertical plate with an upward vapor flow is studied. An approximate integral model of the condensate film and the boundary layer of the vapor is numerically solved, taking into account both gravity and interfacial shear. Here, three types of solution are examined: (i) zero film thickness at the bottom; (ii) zero flowrate with a finite film thickness at the bottom; and (iii) negative flowrates at the bottom. The film thickness and the average Nusselt number are shown as functions of the distance along the plate and the plate length, respectively. The terminal lengths of the solutions of the types (i) and (ii) are calculated against the degree of the subcooling. Moreover, the results are compared with those derived using the approximation method where the shearing stress on the vapor–liquid interface is composed of only the momentum transferred by the suction mass (the Shekriladze–Gomelauri approach). It is found that the average Nusselt number is well described by the Shekriladze–Gomelauri model in the range of the solution type (ii), while the average Nusselt number for the thinnest-film solution of the type (iii) is asymptotically consistent with the Shekriladze–Gomelauri value for long plates.
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      Flow Regimes for Laminar Film Condensation on a Vertical Plate With an Upward Vapor Flow

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    contributor authorKanatani, Kentaro
    date accessioned2022-02-04T14:43:34Z
    date available2022-02-04T14:43:34Z
    date copyright2020/02/27/
    date issued2020
    identifier issn0022-1481
    identifier otherht_142_04_041603.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4274246
    description abstractLaminar film condensation on a vertical plate with an upward vapor flow is studied. An approximate integral model of the condensate film and the boundary layer of the vapor is numerically solved, taking into account both gravity and interfacial shear. Here, three types of solution are examined: (i) zero film thickness at the bottom; (ii) zero flowrate with a finite film thickness at the bottom; and (iii) negative flowrates at the bottom. The film thickness and the average Nusselt number are shown as functions of the distance along the plate and the plate length, respectively. The terminal lengths of the solutions of the types (i) and (ii) are calculated against the degree of the subcooling. Moreover, the results are compared with those derived using the approximation method where the shearing stress on the vapor–liquid interface is composed of only the momentum transferred by the suction mass (the Shekriladze–Gomelauri approach). It is found that the average Nusselt number is well described by the Shekriladze–Gomelauri model in the range of the solution type (ii), while the average Nusselt number for the thinnest-film solution of the type (iii) is asymptotically consistent with the Shekriladze–Gomelauri value for long plates.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleFlow Regimes for Laminar Film Condensation on a Vertical Plate With an Upward Vapor Flow
    typeJournal Paper
    journal volume142
    journal issue4
    journal titleJournal of Heat Transfer
    identifier doi10.1115/1.4046307
    page41603
    treeJournal of Heat Transfer:;2020:;volume( 142 ):;issue: 004
    contenttypeFulltext
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