How does a jet ejector pump use a venturi nozzle to draw in a second fluid stream?

In a jet ejector pump, a primary fluid stream is forced through a venturi nozzle. As the fluid enters the constricted throat of the nozzle, its velocity increases significantly, which causes a corresponding drop in pressure according to the principles of fluid dynamics.12

This localized area of low pressure creates a suction effect. When a second fluid stream is introduced at this point, the pressure differential draws it into the primary flow, where it becomes entrained. In systems such as steam ejectors, the high-velocity primary fluid also transfers momentum to the second stream, and the mixture subsequently passes through a diffuser where kinetic energy is converted back into pressure energy, allowing the combined fluid to be discharged at a higher pressure.1