In Eq. 3, represents the pulsation amplitude. is pulsation frequency. represents the plate spacing. and represent continuous phase density and dispersed phase viscosity, respectively. is the interfacial tension or DIFT in mass transfer conditions. It should be noticed that the DIFT determined by this method is an equivalent average interfacial tension on a cross section of the column. The variation of DIFT in the cross section is not considered.

Results and discussion

Determination of dynamic interfacial tension

Number density function