FBD nozzles are usually connected to a feed system that directs various types of fluids to the nozzle. The fluid can be fed to the nozzle through pipes or compressed air. The flow channel in an FBD nozzle usually becomes progressively narrower, usually in a conical or tapered shape. When the fluid enters the nozzle channel, the shape inside the channel increases the fluid velocity. By reducing the cross-sectional area of the flow channel, the fluid is forced to pass over a larger surface area. The small space increases its speed, and this velocity design helps form a high-speed fluid jet.
