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Detection of interfacial shear stress and droplet detachment using PLIF&PIV methods in horizontal liquid-liquid flows

Horizontal liquid-liquid two-phase flows are widely encountered in petroleum, chemical, pharmaceutical and other important industrial production fields. The detection of interfacial shear stress is of great significance for understanding the flow characteristics and revealing the transition mechanism from stratified to non-stratified flow. In this paper, a PLIF&PIV fluid visualization system was designed, and the dynamic experiment of horizontal liquid-liquid two-phase flow was carried out to obtain PLIF&PIV flow images in three flow patterns as stratified flow (ST), stratified wavy flow (SW) and stratified flow with mixing at interface (ST&MI). The velocity distribution of the aqueous phase and two phases distribution were obtained through image processing, and the aqueous velocity near the interface and the organic phase velocity were extracted, thus deriving the interfacial shear stress distribution. The effect of shear stress on the instability of interfacial waves was studied, and the changing regular of interfacial shear stress during the droplet detachment was observed.