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Diffusive mass transfer between a microporous medium and an homogeneous fluid: Jump boundary conditions
Chem. Eng. Sci. (2006)
  • Francisco J. Valdes-Parada
  • Benoît Goyeau
Abstract

The method of volume averaging is used to derive the diffusive mass transfer boundary conditions for transport between the micro-pores (-region) and the fluid in the macro-pores (-region) in a catalyst pellet. In this configuration, the mass jump boundary condition between the homogeneous regions takes the form

−n · (D∇cA  ) + n · (D · ∇cA  ) = Keff cA  ,

where Keff is the effective reaction rate coefficient at the inter-region. In this study, a closure is derived in order to predict this average jump coefficient as a function of the microstructure of the porous layer and the Thiele modulus. The jump coefficient predicted for three inter-region structures is presented.

Keywords
  • Closure problem,
  • Diffusion,
  • Homogenization,
  • Microstructure,
  • Porous media,
  • Reaction jump coefficient
Publication Date
2006
Citation Information
Francisco J. Valdes-Parada and Benoît Goyeau. "Diffusive mass transfer between a microporous medium and an homogeneous fluid: Jump boundary conditions" Chem. Eng. Sci. Vol. 61 (2006)
Available at: http://works.bepress.com/francisco_j_valdes_parada/10/