Study on the dynamic interfacial tension during mass-transfer process using a novel interface probe method

Dynamic interfacial tension (DIFT) is a key parameter in two-phase flow-coupling mass transfer process. The variation in solute concentration is a critical factor influencing (DIFT) during mass transfer process. However, existing studies rarely achieve the simultaneous determination of DIFT and solute concentrations. This poses challenges for conducting in-depth investigations and making accurate predictions regarding DIFT. In this study, a new interface probe method was developed to simultaneously measure the solute concentration and DIFT. The effects of solute concentration and mass-transfer flux on DIFT were investigated. The results demonstrated that DIFT was not only influenced by solute concentrations, but also correlated with the mass-transfer flux. Based on the experimental results, a predictive model is established that correlates the DIFT with solute concentration and mass-transfer flux. This model shows wide applicability to the experimental results reported in both our present and previous studies. In the future, this model will be a theoretical basis for prediction of flow behavior in liquid–liquid flow coupling with mass transfer.