Mass transport by surface and pore diffusion in drying processes

M.A. Silva, P.J.A.M. Kerkhof, W.J. Coumans

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

The effective diffusivity of Won clay was obtained by considering the mass transfer mechanisms occurring in the pores and on the surface. The binary friction model was used to evaluate the effective gas diffusivity and the Maxwell-Stefan approach to mass transfer was applied to the surface diffusion. Different expressions for the effective diffusivity for porous solids were used considering parallel diffusion, series diffusion and the Clausius-Mossoti model. Numerical results were compared with exptl. data and showed that the Maxwell-Stefan approach, used earlier for surface diffusion in microporous solids, is also a strong tool for evaluating surface diffusion of adsorbed species as bound water. In the pore diffusivity, when both present, capillary flow showed dominance over gas diffusion. The best results were obtained for the parallel model, considering the occurrence of discontinuous capillary flow.
Original languageEnglish
Pages (from-to)339-355
Number of pages16
JournalBulletin of the Polish Academy of Sciences - Chemistry
Volume48
Issue number3
Publication statusPublished - 2000

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Drying
Mass transfer
Surface diffusion
Capillary flow
Diffusion in gases
Gases
Friction
Water

Cite this

Silva, M. A., Kerkhof, P. J. A. M., & Coumans, W. J. (2000). Mass transport by surface and pore diffusion in drying processes. Bulletin of the Polish Academy of Sciences - Chemistry, 48(3), 339-355.
Silva, M.A. ; Kerkhof, P.J.A.M. ; Coumans, W.J. / Mass transport by surface and pore diffusion in drying processes. In: Bulletin of the Polish Academy of Sciences - Chemistry. 2000 ; Vol. 48, No. 3. pp. 339-355.
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Silva, MA, Kerkhof, PJAM & Coumans, WJ 2000, 'Mass transport by surface and pore diffusion in drying processes', Bulletin of the Polish Academy of Sciences - Chemistry, vol. 48, no. 3, pp. 339-355.

Mass transport by surface and pore diffusion in drying processes. / Silva, M.A.; Kerkhof, P.J.A.M.; Coumans, W.J.

In: Bulletin of the Polish Academy of Sciences - Chemistry, Vol. 48, No. 3, 2000, p. 339-355.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Mass transport by surface and pore diffusion in drying processes

AU - Silva, M.A.

AU - Kerkhof, P.J.A.M.

AU - Coumans, W.J.

PY - 2000

Y1 - 2000

N2 - The effective diffusivity of Won clay was obtained by considering the mass transfer mechanisms occurring in the pores and on the surface. The binary friction model was used to evaluate the effective gas diffusivity and the Maxwell-Stefan approach to mass transfer was applied to the surface diffusion. Different expressions for the effective diffusivity for porous solids were used considering parallel diffusion, series diffusion and the Clausius-Mossoti model. Numerical results were compared with exptl. data and showed that the Maxwell-Stefan approach, used earlier for surface diffusion in microporous solids, is also a strong tool for evaluating surface diffusion of adsorbed species as bound water. In the pore diffusivity, when both present, capillary flow showed dominance over gas diffusion. The best results were obtained for the parallel model, considering the occurrence of discontinuous capillary flow.

AB - The effective diffusivity of Won clay was obtained by considering the mass transfer mechanisms occurring in the pores and on the surface. The binary friction model was used to evaluate the effective gas diffusivity and the Maxwell-Stefan approach to mass transfer was applied to the surface diffusion. Different expressions for the effective diffusivity for porous solids were used considering parallel diffusion, series diffusion and the Clausius-Mossoti model. Numerical results were compared with exptl. data and showed that the Maxwell-Stefan approach, used earlier for surface diffusion in microporous solids, is also a strong tool for evaluating surface diffusion of adsorbed species as bound water. In the pore diffusivity, when both present, capillary flow showed dominance over gas diffusion. The best results were obtained for the parallel model, considering the occurrence of discontinuous capillary flow.

M3 - Article

VL - 48

SP - 339

EP - 355

JO - Bulletin of the Polish Academy of Sciences - Chemistry

JF - Bulletin of the Polish Academy of Sciences - Chemistry

SN - 0239-7285

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