Projected jet sprayer
The projected jet sprayer is an old spraying technology, mainly used for weed control under the row. It works by sucking up the spray liquid via a pump, then delivering it through an orifice where the liquid stream is divided into fine droplets by a sudden acceleration. The size of the droplets depends on the pressure and the size of the orifice. The liquid is broken up by nozzles, without air assistance, and the droplets are projected into the air using their kinetic energy to reach their target.
Technical presentation
This is the oldest spraying technology. It is mainly used for weed control under the row, although some equipment still uses this technology.
The jet sprayer works by sucking up the liquid via a pump and then delivering it to an orifice. The liquid stream, subjected to sudden acceleration, breaks up into droplets which are finer the smaller the orifice and the higher the pressure. It is the nozzle that produces the droplet and the shape of the spray.
A projected jet sprayer is one in which the spray liquid is broken up by nozzles, without air assistance.
Why projected spray?
Because the drops produced by pressurising the liquid are projected into the air and it is the kinetic energy they have stored up that enables them to reach their target, having overcome the resistance of the air.
Airblast sprayer - Photo credit IFV (Davy)
Experiment
See the list of experimentsSee more 
