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Continuous measurement of surface and interfacial tension by stationary slug method
Author(s) -
Rao N. V. R.,
Baird M. H. I.
Publication year - 1983
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.5450610413
Subject(s) - surface tension , froude number , pulmonary surfactant , viscosity , thermodynamics , slug flow , tube (container) , mechanics , surface (topology) , materials science , flow (mathematics) , chemistry , composite material , two phase flow , physics , mathematics , geometry
The surface tensions of various liquids have been measured continuously by controlling their flow so that a slug of air is held stationary in a vertical tube. The dependence between the velocity (expressed as Froude number) and surface tension (expressed as Eotvos number) has been correlated for many low viscosity liquids. An extension of the correlation to viscous liquids has also been proposed and the effect of temperature has been studied. Due to dynamic surface tension effects, the data for surfactant solutions measured by this continuous method are higher than values found by static (equilibrium) techniques, so the method is not recommended for surfactant solutions. A slight modification of the apparatus and procedure permits the continuous measurement of interfacial tensions of liquid‐liquid systems, data for which are also presented.