Building a better drop generator

A lattice of bouncing droplets produced by our droplet generator.

We present the design of a piezoelectric droplet-on-demand generator capable of producing droplets of highly repeatable size ranging from 0.5 to 1.4 mm in diameter. The generator is low cost, simple to fabricate, and suitable for hydrodynamic quantum analog experiments. We demonstrate the manner in which droplet diameter can be controlled through variation of the piezoelectric driving waveform parameters, outlet pressure, and nozzle diameter.
See paper here:  Harris, Liu & Bush (2015)

A millimetric drop from our drop generator is released onto a vibrating liquid bath.