69th Annual Meeting of the APS Division of Fluid Dynamics (November 20, 2016 — November 22, 2016)

P0050: Liquid ligament generation at a free surface

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Authors

• Daniel M. Harris, University of North Carolina at Chapel Hill

DOI: https://doi.org/10.1103/APS.DFD.2016.GFM.P0050

A stainless steel cylinder of diameter 1.7 mm is partially submerged beneath an air-oil interface.  The cylinder is connected to the shaft of an air piston actuated by a solenoid valve which rapidly retracts the partially submerged cylinder at approximately 400 mm/s.  A liquid ligament forms at the free surface which then contracts to form a droplet.  This controlled extraction technique can be used to generate droplets of a repeatable size from a quiescent bath.  The size of the resulting droplet or droplets depends sensitively on the speed of retraction, the cylinder diameter, and the fluid properties as well as on the initial immersion depth.  In particular, larger droplets are created as the initial immersion depth is increased.  For the experiments shown, a 10 cSt silicone oil is used.