GLOSSARY
Flash Evaporation
Flash evaporation is the near-instantaneous transition of liquid water into vapour when ultra-fine droplets enter unsaturated air. In mist cooling, droplets under 10 microns achieve flash evaporation, absorbing heat from the air and cooling the ambient zone without wetting any surface.
Also known as: Instant evaporation · Adiabatic flash
The physics
Water evaporation absorbs 2,260 kJ per kilogram (≈ 628 Wh per litre). When this heat transfer happens in the air before a droplet contacts any surface, the ambient temperature drops but the surface remains dry. This is flash evaporation.
Droplet surface area scales inversely with diameter cubed — a 10-micron droplet has 1,000× more surface area per unit volume than a 1-mm droplet. More surface area = faster evaporation. Below 10 microns, droplets evaporate in milliseconds even at 85% relative humidity.
Why 70-bar pressure enables flash evaporation
Producing droplets under 10 microns requires forcing water through nozzle orifices smaller than the droplet target size. This demands pump pressures of 70 bar (1000 PSI) or higher. Hardware-store misters at 5–10 bar cannot produce flash-evaporating droplets — they produce wet mist that lands on surfaces.
In MistSystem operation
Every MistSystem nozzle is specified to achieve flash evaporation across Indonesian climate conditions (28–34°C, 70–85% humidity). The result is 8–12°C ambient cooling in the treated zone with no wet surfaces.