Microfluidic device for spraying very small drops of liquids

A microfluidic device comprising:

• a plurality of emitter groups, each emitter group comprising:
• a plurality of chambers, the chambers having an elongated shape;
• a plurality of fluidic access channels in fluidic connection with the plurality of chambers, respectively;
• a plurality of nozzle apertures in fluidic connection with the plurality of chambers, respectively;
• and
• a plurality of actuators operatively coupled to the plurality of chambers, respectively, and configured to cause ejection of drops of fluid through the plurality of nozzle apertures in an operating condition of the microfluidic device;
• a chamber layer that forms the plurality of chambers;
• a nozzle layer on the chamber layer, the nozzle layer forms a plurality of nozzle openings,
• each of the plurality of chambers being delimited by a lateral wall having a plurality of indentations and protrusions;
• and
• the plurality of nozzle openings being offset with respect to the plurality of chambers, with each of the plurality of nozzle openings extending between two adjacent chambers and intersecting indentations of the two adjacent chambers,
• wherein the plurality of nozzle apertures are formed at intersection areas of the plurality of nozzle opening and the plurality of indentations.