Finite element analysis of a moving boundary value problem

Qianli Liu, Joseph Irudayaraj

Research output: Contribution to journalArticlepeer-review


A finite element formulation and the solution of a set of nonlinear coupled heat and mass transfer equations for a two-phase system with a moving evaporation interface is presented. The interface condition takes into account the moisture transfer balance at the moving boundary. The finite element results were compared with existing results for a single phase system for model validation. In the two-phase system, the movement of evaporation front has an appreciable effect on the temperature and moisture distribution inside the porous medium during drying. The effect of the nondimensional heat of vapourization parameter 7 on the evaporation front, temperature and moisture distribution in porous medium was studied. The higher the value of 7, the slower is the movement of the evaporation front. The temperature decreased and the moisture content increased as the nondimensional vapourization parameter 7 increased. This model has potential applications in studying the heat and mass transfer characteristics in food and biomaterials.

Original languageEnglish (US)
Pages (from-to)99-123
Number of pages25
JournalDrying Technology
Issue number1-2
StatePublished - Jan 1 1995
Externally publishedYes


  • distribution
  • evaporation front
  • heat of vapourization
  • porous medium
  • temperature and moisture

ASJC Scopus subject areas

  • General Chemical Engineering
  • Physical and Theoretical Chemistry


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