Abstract
By permeation of a gaseous diffusant, pressure modulations may be transmitted through a solid foil from one experimental chamber to another. The resulting attenuation and phase lag of the transmitted modulation depend on all processes capable of influencing the diffusant flux. It is shown that diffusants which take part in surface reactions of finite rate or are subject to reversible trapping within the solid have a frequency response characteristic of the process involved. Mathematical separation of the bulk and surface processes is effected by a treatment which uses a separate matrix to describe each process and so is readily applied to the problem of multiply controlled flows. The analysis suggests that experimental separation of processes is possible even when both surface reaction and internal trapping have a part in determining rate of flow.
Similar content being viewed by others
References
O. Richardson:Phil Mag., 1904, vol. 7, p. 266.
J. S. Wang:Proc. Cam. Phil. Soc., 1936, vol. 32, p. 657.
H. A. Daynes:Proc. Roy. Soc., 1920, vol. A97, p. 286.
R. M. Barrer:Trans. Farad. Soc., 1939, vol. 35, p. 628.
E. Fromm, H. Uchida, and B. Chellari:Ber. Bunsenges Phys. Chem., 1983, vol. 87, p. 410.
A. D. LeClaire:Diffusion and Defect Data, 1983, vol. 33, p. 1.
M. Iino:Acta Metall., 1982, vol. 30, p. 367.
K. K. Shah, H. G. Nelson, D. L. Johson and F. M. Hamaker:Metall. Trans. A, 1975, vol. 6A, p. 373.
J. Volkl and G. Alefeld:Hydrogen in Metals, G. Alefeld and J. Volkl, eds., Springer Verlag, New York, NY, 1978, vol. 1, p. 321.
N. Boes and H. Zuchner:J. Less-Common Metals, 1976, vol. 49, p. 223.
H. M. Morrison and D. A. Blackburn, and K. M. Chui:J. Nucl. Mater., 1978, vol. 69 & 70, p. 598.
W. M. Robertson: Proc. 2nd Int. Conf.,Environmental Degradation of Engineering Materials in Hydrogen, Blacksburg, VA, Sept. 1981, M. R. Louthan, R. P. McNeil, and R. D. Sisson, eds.
Y. Hayashi and A. Tahara:J. Jpn. Inst. Met., 1983, vol. 47, p. 180.
D. L. Cummings, R. L. Reuben, and D. A. Blackburn,:Metall. Trans. A, 1984, vol. 15A, p. 639.
A. McNabb and P. K. Foster:Trans. Met. Soc. AIME, 1963, vol. 227, p. 618.
R. A. Oriani:Acta Metall., 1970, vol. 18, p. 147.
F. C. Tompkins:Chemisorption of Gases on Metals, Academic Press, London, 1978.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Cummings, D.L., Blackburn, D.A. The effect of pressure modulation on the flow of gas through a solid membrane: Surface inhibition and internal traps. Metall Trans A 16, 1013–1024 (1985). https://doi.org/10.1007/BF02811671
Issue Date:
DOI: https://doi.org/10.1007/BF02811671