Determination of dynamic interfacial tension in a pulsed column under
mass transfer condition
Abstract
Interfacial tension is an essential physical property in two phase flow
and it changes due to the mass transfer. The measurement of dynamic
interfacial tension (DIFT) in such condition is a difficult problem. In
previous study (Zhou at al., Chem Eng Sci. 2019; 197:172-183), we
presented the quantitative relation between the droplet breakup
frequency function (DBFF) and interfacial tension. It is found that the
DBFF is highly depends on interfacial tension. Therefore the DBFF is a
suitable parameter to quantitatively characterize the interfacial
tension. Based on this concept, the DIFT in the column is determined by
regression method after the DBFF under mass transfer condition is
measured. It is found that the DIFT is smaller than the static
interfacial tension. This result indicates that interphase mass transfer
leads to decreasing of the interfacial tension. The decreasing extent of
the DIFT has a positive correlation with the mass transfer flux.