| Popis: |
At low velocities, horizontal liquid-liquid flows uder go gravitation ally-induced stratification, which in many practical applications complicates significantly the direct measurement of the average properties of the flow. The extent of flow stratification, however, can be limited through in line mixing leading to the formation of liquid-liquid dispersions with more homogenous properties. In this work, we focus on the use of‘ active’ mixing methods using jets in cross flows (JICFs). In this paper, a dedicated experimental flow facility for the investigation of such flows is presented, along with the accompanying laser-based optical measurement techniques and associated algorithms that have been developed for this investigation. The facility allows simultaneous, space-and time-resolved phase and velocity information to be generated via plan ar laser-induced fluorescence (PLIF) and particle velocimetry (PIV/ PTV), with stereo-PIV used to provide information on the third (out- of-plane) velocity component. Preliminary experimental results are presented which demonstrate the capabilities of this arrangement for optically examining stratified liquid-liquid flows interacting with JICFs, leading to new insights into these complex flows. The key results include phenomena of jets interacting with the liquid-liquid inter face, recirculation zones that lead to further mixing, the presence of complex compound droplets, droplet size distributions, and water concentration profiles. |
