Microstructured nozzle

A microstructured passage module for an aerosol generator, comprising:

• an entrance for a liquid to enter;
• an exit for the liquid to exit, wherein a direction perpendicular to the entrance defines a liquid flow direction;
• a plate including a first zone and a second zone between the entrance and the exit,
• wherein the first zone comprises:
• a plurality of walls arranged in columns over an entire width of the first zone defining a plurality of passages therebetween, wherein the plurality of passages correspond to the liquid flow direction;
• and
• a plurality of pillars disposed in the second zone and in at least section of the passages in the first zone, defining a plurality of channels inbetween,
• wherein the plurality of pillars are adapted to adjust a speed of the liquid flowing across the plate;
• wherein the plurality of pillars disposed in the plurality of passages increase a flow resistance for the liquid flowing through the plurality of passages, and
• wherein the plurality of walls and pillars project from and are integral parts of the plate.