Doctoral Dissertations


"A modified dusty-gas model which accounts for the effects the pore-size and tortuosity distributions have on the mass fluxes in heteroporous media is presented. The behavior of the dusty-gas model (homoporous model) can be obtained from the modified model when the pressure is either very low or very high as well as for intermediate pressures when the characteristic parameter of the introduced tortuosity function has a very small value. When the pressure is very high or very low, all pores in the porous medium are almost in a single transport regime of either molecular or Knudsen diffusion.

Comparisons of the mass fluxes predicted by the two models for binary isobaric diffusion, simultaneous diffusion and flow, and for chemical reactions with mole changes in heteroporous media show that the percentage deviations between the mass fluxes and the effectiveness factors calculated by the dusty-gas and the modified dusty-gas models can be significant. An analysis of the results indicates that the dusty-gas model could fail in predicting accurately the mass fluxes and effectiveness factors in porous systems with wide pore-size distributions, and it is suggested that the modified dusty-gas model, which incorporates the pore-size and tortuosity distributions in its constitutive equations, should be appropriate for use in the design and prediction of the performance of separation and reaction systems involving porous media required to operate in the transition transport regime"--Abstract, page iii.


Liapis, Athanasios I.

Committee Member(s)

Crosser, Orrin K.
Findley, Marshall E., 1927-1991
Poling, Bruce E.
Avula, Xavier J. R.


Chemical and Biochemical Engineering

Degree Name

Ph. D. in Chemical Engineering


University of Missouri--Rolla

Publication Date

Fall 1982

Journal article titles appearing in thesis/dissertation

  • Comparison of mass fluxes predicted by the dusty-gas and a modified dusty-gas model
  • Chemical reactions with mole changes in heteroporous catalysts - Part I
  • Chemical reactions with mole changes in heteroporous catalysts - Part II


xii, 218 pages

Note about bibliography

Includes bibliographical references (pages 216-218).


© 1982 Elmer Anthony Klavetter, All rights reserved.

Document Type

Dissertation - Restricted Access

File Type




Subject Headings

Gas dynamics
Porous materials

Thesis Number

T 4836

Print OCLC #


Electronic OCLC #


Link to Catalog Record

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