High speed jets

Ink-jet printing technology relies on the production of drops of well-controlled size, and satellite drops are highly detrimental to the quality of the product. With Dr. J. Etienne and Prof. J. Hinch, we employ the ALE (Arbitrary Lagrangian Eulerian) method working on an adaptive unstructured mesh to explore different parameter regimes and the effect of inclusion of tiny amount of polymer. This method can eventually be used to investigate solder jets. Solder jets have a wide range of applications, including printing integrated circuits. It operates on a metal melt at high temperature through a very small nozzle (ideally of 1 micro diameter).

Drop formation from a jet of Newtonian fluid, Reynolds number 30 and Weber number 47.

The collapse of a jet of Oldroyd-B fluid, Deborah number 300.