The size of the limit water droplet is a major performance index of the blade. It refers to the size of the smallest water droplet that can be completely separated under the corresponding wind speed and operating conditions.
The diagram shows the limit of the size of the water droplets in the air / water system calculated at 20℃ and a standard atmospheric pressure.

The pressure drop can be measured under the environmental conditions (20 C, 1 bar), through a large number of blade combinations with different blade spacing and in the ideal state.

The percentage of water droplets that are less than the size of the limit water droplets that can be removed from the air flow under the corresponding wind speed called classification efficiency.