Numerical simulation of conjugate heat and mass transfer process within cylindrical porous media with cylindrical dielectric cores in microwave freeze-drying

Zhi Tao, Hongwei Wu, Guohua Chen, Hongwu Deng

Research output: Journal article publicationJournal articleAcademic researchpeer-review

47 Citations (Scopus)


This paper presents a numerical model for the process of microwave freeze-drying within a cylindrical porous media with cylindrical dielectric cores. The set of transient governing equations developed are solved numerically with variable time-step finite volume method. Analysis of numerical results may lead to following main conclusions for the new freeze-drying process: (1) Proper usage of cylindrical dielectric cores could dramatically reduce the drying time. (2) The loss, factor εof the cylindrical dielectric core is an important parameter influencing the drying behavior. (3) Two sublimation fronts do exist within the porous media due to the existence of inner dielectric cores. (4) The impact of cylindrical dielectric cores on drying could not be ignored even though the initial saturation is low (S0= 0.2).
Original languageEnglish
Pages (from-to)561-572
Number of pages12
JournalInternational Journal of Heat and Mass Transfer
Issue number3-4
Publication statusPublished - 1 Jan 2005
Externally publishedYes


  • Cylindrical dielectric core
  • Freeze-drying
  • Heat and mass transfer
  • Loss factor
  • Porous media

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes

Cite this