Generation and spraying of microscopic water droplets

An apparatus for producing water droplets for dispersal in the atmosphere, the apparatus comprising:

• a. a drum configured to rotate at least in a first rotating direction, the drum comprising:
• i. a cylindrical central receptacle comprising a surrounding peripheral wall having an array of holes passing radially therethrough, wherein at least 95% of the holes of the array have a respective maximum dimension of not more than 10 microns,
• ii. a plurality of fins emanating radially from, and spaced around, the peripheral wall,
• iii. first and second opposing covers defining a length of the drum in an axial direction;
• and
• b. a motor in mechanical communication with the drum, configured to rotate the drum in the first rotation,
• wherein when the central receptacle is placed in fluid communication with a source of water, and the motor is activated in an operational mode to rotate the drum in the first rotation direction at a rotational speed of at least 20,000 rpm, water received in the central receptacle is expelled through the array of holes by a centrifugal force, and a presence of the shaped fins is effective to create an airflow in the first rotation direction that at least partly counteracts a Coriolis force deflecting the expelled water against the first rotation direction.