Generation and spraying of microscopic water droplets

The apparatus of any one of the preceding claims, additionally comprising an electrically-powered fan arranged to spin and create, when the apparatus is in said operational mode, an axial airflow that changes a direction of the expelled water.

The apparatus of any one of the preceding claims, wherein the electric motor is activatable in the operational mode to rotate the drum in the first rotation direction at a rotational speed of at least 30,000 rpm, or at least 40,000 rpm, or at least 50,000 rpm.

The apparatus of any one of the preceding claims, wherein at least 95% of the holes are displaced between 10 microns and 100 microns from a respective nearest hole.

The apparatus of any one of the preceding claims, wherein respective radial distances between droplets increase when said droplets move outward in the radial direction at least within the rotating air between the fins.

A method of producing water droplets for dispersal in the atmosphere, the method comprising:

• a. providing the apparatus of any one of the preceding claims such that the central receptacle is placed in fluid communication with the source of water;
• b. activating the electric motor to rotate the drum in the first rotation direction at a rotational speed of at least 20,000 rpm, a centrifugal force created by the rotating being effective to expel, through the array of holes, water received in the central receptacle,
• wherein the presence of the shaped fins creates an air flow in the first rotation direction that at least partly counteracts a Coriolis force deflecting the expelled water against the first rotation direction.

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 micro-holes passing radially therethrough, (ii) a plurality of fins emanating radially from, and spaced around, the peripheral wall, the fins being shaped such that respective radially-outward portions thereof are curved and/or bent forward in the first rotation direction, and (iii) first and second opposing covers defining a length of the drum in an axial direction;
• and
• b. an electric motor in mechanical communication with the drum, configured to rotate the drum in the first rotation direction, so as to create a hydrostatic pressure when water is present in the central receptacle to centrifugally accelerate water through the array of micro-holes.