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Nonequilibrium Thermal Dynamic Modeling of Porous Medium Vacuum Drying Process

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  • Zhijun Zhang
  • Ninghua Kong

Abstract

Porous medium vacuum drying is a complicated heat and mass transfer process. Based on the theory of heat and mass transfer, a coupled model for the porous medium vacuum drying process is constructed. The model is implemented and solved using COMSOL software. The water evaporation rate is determined using a nonequilibrium method with the rate constant parameter K r . K r values of 1, 10, 1000, and 10000 are simulated. The effects of vapor pressures of 1000, 5000, and 9000 Pa; initial moistures of 0.6, 0.5, and 0.4 water saturation; heat temperatures of 323, 333, and 343 K; and intrinsic permeability of 10 −13 , 10 −14 , and 10 −15 m 2 are studied. The results facilitate a better understanding of the porous medium vacuum drying process.

Suggested Citation

  • Zhijun Zhang & Ninghua Kong, 2012. "Nonequilibrium Thermal Dynamic Modeling of Porous Medium Vacuum Drying Process," Mathematical Problems in Engineering, Hindawi, vol. 2012, pages 1-22, July.
    • Handle: RePEc:hin:jnlmpe:347598
    DOI: 10.1155/2012/347598
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