Mixing during coalescence with pinch-off —Thomas Sykes (University of Leeds)

A dyed falling droplet coalescing with an undyed sessile droplet of equal fluid properties, with pinch-off preceding permanent coalescence and internal jet formation. Video shows 25ms, played 500x slower than real time. Frame is approximately 6mm wide.

https://downloads.sms.cam.ac.uk/3317751/3317759.mp4