Liquid-Vapour Phase change between plane liquid surfaces: A continuum analysis to determine real gas effects

Shankar, PN (1988) Liquid-Vapour Phase change between plane liquid surfaces: A continuum analysis to determine real gas effects. Technical Report. National Aeronautical Laboratory, Bangalore, India.

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    Abstract

    A continuum analysis is given of the problem of steady evaporation and condensation between plane liquid surfaces of infinite extent. Following Marble (1966)13; the continuum equations are solved in the bulk of the gas with the appropriate boundary conditions coming from an analysis of the Rnudsen layers near the liquid surface. The present analysis includes the diffusion effects caused by the presence of an inert gas on the phase chanw process. A valuable by-product of the present approach is that real gas effects can be estimated. Formulae13; are given for the mass flux and temperature distrubution which exhibits, under certain circumstances, the now familiar anomalous inversion. The real gas and13; diffusion effects turn out to be strikingly large, it is shown that the temperature jump in the case of polyatomic molecules is always the corresponding jump for a monatomic gas. In fact for a crltical aroonnd 1.08 - 1.2 the13; anomalous temperature inversicn disappears, The contamination is the distance between the liquid surfaces. Contamination rapidly decreases the mass flux and the temperature jumps at the liquid surfaces. Some sample calcuiations are included of possibly experimentally realizable situations, The calculations dearly indicate the direction that experimental investigations ought to take.13; always harmful and depends on the number is the distance between the liquid surfaces. Contamination rapidly13; decreases the mass flux and the temperature jumps a t the liquid surfaces. Some sample calcuiations are included of possibly experimentally realizable situations, The calculations dearly indicate the direction that experimental investigations ought to take.

    Item Type: Proj.Doc/Technical Report (Technical Report)
    Uncontrolled Keywords: Phase change;Weal gas effects
    Subjects: ENGINEERING > Fluid Mechanics and Thermodynamics
    Division/Department: Fluid Dynamics
    Depositing User: M/S ICAST NAL
    Date Deposited: 27 Sep 2006
    Last Modified: 24 May 2010 09:51
    URI: http://nal-ir.nal.res.in/id/eprint/2826

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