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    National Tsing Hua University Institutional Repository > 工學院  > 動力機械工程學系 > 期刊論文 >  AN ENTHALPY FORMULATION FOR PHASE-CHANGE PROBLEMS WITH A LARGE THERMAL-DIFFUSIVITY JUMP ACROSS THE INTERFACE


    Please use this identifier to cite or link to this item: http://nthur.lib.nthu.edu.tw/dspace/handle/987654321/49918


    Title: AN ENTHALPY FORMULATION FOR PHASE-CHANGE PROBLEMS WITH A LARGE THERMAL-DIFFUSIVITY JUMP ACROSS THE INTERFACE
    Authors: LEE, SL;TZONG, RY
    教師: 李雄略
    Date: 1991
    Publisher: Elsevier
    Relation: International Journal of Heat and Mass Transfer, Elsevier, Volume 34, Issue 6, June 1991, Pages 1491-1502
    Keywords: SPECIES TRANSPORT
    CONTINUUM MODEL
    CHANGE SYSTEMS
    HEAT
    EQUATIONS
    MOMENTUM
    Abstract: An enthalpy formulation is proposed in the present investigation for a phase change material (PCM) having a distinct freezing temperature. The latent heat is separated from the sensible heat such that there exists a dependent variable (the sensible heat) that is a continuous function over the entire physical domain. Inside each control volume, the latent heat is rigorously evaluated from the fraction of the liquid phase to achieve an even latent heat evolution. In the dimensionless transformation, the characteristic time is defined in terms of the Stefan number. The coefficients of the unsteady terms thus are always less than unity. This will achieve a good numerical stability for any Stefan number. In addition, this particular transformation makes the present enthalpy formulation applicable to single phase problems if an infinite Stefan number is assigned. To account for a thermal diffusivity jump at the liquid-solid interface, a modified weighting function scheme is developed. Through a few examples, the present enthalpy formulation is seen to produce an accurate and smooth liquid-solid interface for PCM having a distinct freezing point.
    URI: http://www.elsevier.com/
    http://nthur.lib.nthu.edu.tw/dspace/handle/987654321/49918
    Appears in Collections:[動力機械工程學系] 期刊論文

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