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

Abstract 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.