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A generalized correlation of diffusion coefficients
Author(s) -
Fair J. R.,
Lerner B. J.
Publication year - 1956
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690020104
Subject(s) - diffusion , thermodynamics , gaseous diffusion , effective diffusion coefficient , chemistry , binary number , mathematics , physics , medicine , arithmetic , electrode , radiology , magnetic resonance imaging
Graphical correlations of binary gas diffusion coefficients are developed based on the Hirschfelder‐Bird‐Spotz diffusion equation and the theorem of corresponding states. A critical diffusion coefficient is defined and is used in turn for a definition of a “reduced” coefficient. The reduced diffusion coefficient is correlated graphically in generalized form in terms of the reduced properties of the diffusing gas. Using air as a reference “barrier” gas, the authors compared critical diffusion coefficients for various gases diffusing through a single barrier gas with the critical coefficients for these gases through air. This ratio, termed the barrier gas ratio , was found to be independent of the properties of the diffusing gas. A graphical correlation of the barrier gas ratio enables rapid estimation of a binary diffusion coefficient with a minimum of information.