A model for the phase change behavior of graphite when exposed to a high external radiation heat flux has been developed in order to examine solid-gas nonequilibrium effects. The usual Knudsen-Langmuir type model is extended to one which allows both pressure and temperature discontinuities at the ablating surface. Calculated results indicate a relatively constant effective heat of ablation. However, major uncertainties are shown to remain regarding individual carbon species concentrations and the input energy required for melting. A unique feature of the irreversible thermodynamics model is the prediction of gas phase supersaturation when JANNAF thermochemical data is utilized. (De Posamentier)


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    Title :

    An irreversible thermodynamics model for graphite sublimation in intense radiation environments


    Additional title:

    Irreversibles thermodynamisches Modell der Graphitsublimation unter dem Einfluss hoher Waermestrahlungen


    Contributors:
    Baker, R.L. (author)

    Published in:

    Publication date :

    1978


    Size :

    9 Seiten, 8 Bilder, 1 Tabelle, 24 Quellen


    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English