The following videos show our latest experimental results.
Droplet-on-Demand is performed by applying a series of positive pulses to the dispersed phase while keeping the continuous phase at constant input pressure. Between the pulses, the system remains in stable equilibrium. By controlling the duration of the pulse, one can control the size of the droplet. By varying the time between two successive pulses, the distance between two droplets can be adjusted to the desired value.
Droplet-Trains-on-Demand (DToD) is performed using a simple T-junction generation and a pulsing method. The method relies on a finding the equilibrium state between the two phases (dispersed and continuous) and applying a positive pulses to overcome the equilibrium state and generate a droplet. The size of the droplet is proportional to the duration of the pulse, while the distance between two droplets is proportional to the time between two successive pulses. When no pulse is applied, the system remains in the equilibrium state. Applying a preprogrammed sequence of pulses through the pump interface, it is possible to generate droplet trains on demand. It is possible to generate an arbitrary combination of droplets inside the train. Inside each train, any combination of droplets (varying in droplet size and inter-droplet distance) is feasable.