Particle image velocimetry inside in-axis and off-axis stretched Newtonian liquid bridges

Supplemental material for the publication: "Particle image velocimetry of the flow field inside in-axis and off-axis stretched liquid bridges" by Fritzsche, L., Bauer, K., Schwarze, R. (2025). The study introduces a novel experimental technique that enables comprehensive visualization and measurement of the internal flow field of liquid bridges throughout the stretching process. By embedding the liquid bridge in a refractive-index-matched immiscible outer liquid phase, unobstructed optical access to the entire volume is provided and optical distortions are eliminated. The data collection archived here contains the time-resolved PIV data (velocity fields) for all cases discussed in the publication, raw images for two representative cases (plate speeds 5 mm/s), and evaluated minimum diameters over time (including raw images) for liquid-air systems to compare to the liquid-liquid system of the PIV measurements.