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On the conditions for stability of falling films subject to surface tension disturbances; the condensation of binary vapors
Author(s) -
Ford J. D.,
Missen R. W.
Publication year - 1968
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450460505
Subject(s) - marangoni effect , surface tension , falling (accident) , condensation , instability , binary number , materials science , mechanics , maximum bubble pressure method , stability (learning theory) , sign (mathematics) , thermodynamics , optics , physics , mathematics , computer science , mathematical analysis , arithmetic , environmental health , medicine , machine learning
Examination of available experimental information, including that on condensation of binary vapors, indicates that the Marangoni effect provides a consistent interpretation of falling film behavior, when surface tension disturbances are important. Criteria provided by the Marangoni effect are: d / db 0 for stability, where is surface tension and b film thickness, and d / db > 0 for instability; the latter is evidently a necessary but not sufficient condition. Methods are given for evaluating the sign of d / db in terms of the product of two factors, one characteristic of the system and one of the operation.