August 26, 2019
Bigger is not always better for water droplets
The size of the water droplets matters for spray nozzle
Sometimes in order to spray water, a hole is to drill in a pipe or a hose. But with this technique, there is no control over the water droplet and it will always wet even with a small hole and lower water pressure.
Spray nozzles exist in a wide range of category in order to be able to handle a large scale of droplet size from under 10 µm up to 1.0 mm like rain.
How big the water droplet need to be for what type of application?
Depending on the application, the size of the droplet is crucial
Spray nozzles are becoming increasingly important elements of the foundation for manufacturing.
Thousands of them are used in a factory for cleaning, spraying, coating, moisture control, polishing, etching, cutting, stripping, degreasing, descaling, foam breaking, rinsing, fire extinguishing, trimming, etc.
That is why it is important to be able to control the size of the water droplet for each application.
Some application need a strong spray impact with small water drops of 140 µm for an efficient cleaning.
While for FGD in pollution control for example, a larger mean droplet diameter of 1,800 up to 3,800 µm is common.
Here are 2 specific example: cooling and humidification.
Cooling without wetting
Even if it feels good to get cooled down by water during heat waves, getting soak wet is still not a nice feeling. Getting cooled down without being wet is where our expertise in water drops comes handy.
For example, we can cool down animals in the livestock industry without stressing them as they don’t feel the small water drops. The water (with a mean droplet diameter of 35 to 65 µm for example) evaporates in the air before reaching the animals and thus, the barn stays nicely humid and cooled down without any water puddles.
It is even beneficial for the livestock as not only the animals are cooled down, but the productivity also increased due to the reduction of the stress.
Humidifying without wetting
An example of an application where the size of the water droplets is important: humidifying in a clean room where equipment cannot be wet.
We are able to spray a Dry Fog with water droplets of an average of 7.5 µm (for AKIMist®”E” 03C) which won’t wet the environment, nor the machines or the operators.
Therefore, clean rooms, electronics SMT companies, and other industries that need Dry Fog can maintain a relative humidity at the level they require without the fear of wetting and damaging their production.
For additional information about the measurement of the droplet size, you can read more detail in our previous article “Droplet size: what to understand about the measuring methods“.