Under the Microscope: Liquid jets (Lecture 11 of 17) Cambridge University

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In this video Dr Sungjune Jung shows us the fluid structures produced by the impact of two liquid jets.

Cambridge University's Under the Microscope is a collection of videos that show glimpses of the natural and man-made world in stunning close-up. Check out the rest of the series here: http://bit.ly/A6bwCE

Dr Jung:

"This video shows the evolution of the flow structures generated from the collision of two liquid jets each with a radius of 420um. The jets were ejected from parallel cylindrical nozzles with an internal diameter of 0.85mm.

The collision of the jets resulted in various systems of behaviour which depend on the jet velocities and the liquid properties. We focus on the system where the impinging jets form a liquid sheet which then breaks up into a regular succession of ligaments and droplets, a so-called "fishbone" pattern. This high-speed imaging reveals a fish-like formation for the fluid:
the oval sheet with rims correspond to the fish head, the drops on thin ligaments to its body, and bigger free drops at the end to its tail. We are particularly interested in this fluid formation, because the fishbone phenomenon provides a simple and visual tool to evaluate the properties of inkjet printing fluids, with which the fishbone structure sensitively varies."

Many thanks to Prof Ian Hutchings, Dr Graham Martin and Dr Steve Hoath at Inkjet Research Centre, Department of Engineering.

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