Premium
The effect of temperature on coalescence of liquid drops at liquid/liquid interfaces
Author(s) -
Vijayan S.,
Furrer M.,
Ponter A. B.
Publication year - 1976
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.5450540405
Subject(s) - coalescence (physics) , surface tension , drop (telecommunication) , materials science , liquid liquid , liquid drop , emulsion , thermodynamics , chemistry , chemical physics , mechanics , composite material , chromatography , organic chemistry , physics , computer science , astrobiology , telecommunications
Abstract Drop/interface coalescence times measured at 293–343K are reported for three oil/water systems (benzene, paraffin oil and 1,1,2,2‐tetrabromoethane) with different interface ages. The anomalous coalescence behavior of water droplets is explained by considering the static electrical double‐layer residing at the interface which influences the film thinning and the film rupture processes. Analyses using simplified coalescence models reveal that the incorporation of temperature dependence on the physical properties such as density difference between phases, viscosity of the continuous medium and interfacial tension, does not produce satisfactory agreement with the measured coalescence times. The effect of mutual saturation in contrast to unsaturated systems on coalescence times is illustrated. The reproducibility of the drop/interface coalescence times is examined and explanations are offered, relating the method and the conditions of the experimentation. Finally the importance of both the coalescence time and the film thickness to drop stability analysis is demonstrated.