A vapor bubble developing at a nucleation site on a superheated wall is modeled as a spherical segment whose base is separated from the wall by a thin liquid microlayer. Two dynamic equations are derived from a variational equation of conservation of the mechanical energy for the system composed of the bubble and the surrounding liquid. These equations serve to find the bubble radius and the height of its center above the wall. They are completely free from arbitrary assumptions made by authors of previous models. When being attached to the wall, the bubble evolves under action of buoyancy and of an effective surface tension force, and ultimately detaches due to the same forces. The moment of detachment comes as the height of the bubble center draws equal to its radius. Our model is applied to nearly spherical bubbles of thermally-controlled growth with allowance made for evaporation from the microlayer as well as from the bulk of ambient liquid. Gravitational effects on the duration of bubble evolution, bubble growth rate, and the bubble departure size are treated. The conclusions inferred by the model are in satisfactory agreement with experimental results.


    Zugriff

    Zugriff über TIB

    Verfügbarkeit in meiner Bibliothek prüfen


    Exportieren, teilen und zitieren



    Titel :

    Modeling of vapor bubble growth under nucleate boiling conditions in reduced gravity


    Weitere Titelangaben:

    Modellierung des Dampfblasenwachstums unter Bedingungen des Blasensiedens in verminderter Schwerkraft


    Beteiligte:
    Buyevich, Y.A. (Autor:in) / Webbon, B.B. (Autor:in)


    Erscheinungsdatum :

    1995


    Format / Umfang :

    8 Seiten, 6 Bilder, 21 Quellen


    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




    Enhancements of nucleate boiling under microgravity conditions

    Zhang, Nengli / Chao, David / Yang, W. | AIAA | 2000


    Nucleate Pool Boiling of Water in Normal and Reduced Gravity Environments

    Yendler, Boris / Webbon, Bruce W. / Miles, John B. | SAE Technical Papers | 1994




    AIAA-2001-4995 Bubble Dynamics and Heat Transfer Associated with Pool Nucleate Boiling Under Microgravity Conditions

    Dhir, V. / Qiu, D.-M. / Chao, D. et al. | British Library Conference Proceedings | 2001