Abstract: A spray generator for producing a spray of liquid droplets of a narrow size spectrum in which a substantially uniform cyclic disturbance is imposed on fluid energing at a nozzle. Such a disturbance can be produced by a fluidic bistable oscillator or by allowing the fluid to flow across a bluff body in the flow path. An opposed jet arrangement can be located within the vortex chamber of a fluidic diode and the liquid spray produced can meet swirling gas introduced at tangential inlets to the chamber.

Abstract: A vortex amplifier functions as a choke valve to control flow in a flow line from, for example, a gas or oil well. The vortex amplifier is arranged in the flow line such that flow passes radially through the vortex amplifier to emerge at an axial port. A control flow is introduced tangentially into the vortex amplifier along a line by a pump. The pump is regulated by a transducer responsive to signals generated by the flow in the flow line.

Abstract: A fluidic contactor comprising a vortex stage and a separator stage. The vortex stage is in the form of a vortex chamber whereby fluids of different densities when introduced into the chamber through one or more tangential inlets are caused to swirl through the chamber before passing into the separator stage which is in the form of a column forming an extension of an axial outlet from the vortex chamber. In passing along the column the fluids become separated and emerge through separated outlets at the end of the column remote from the chamber. The fluids can be mixed together before entry into the chamber or separate fluids can be intimately mixed together in swirling through the chamber, in each case to permit mass transfer of constituents between the fluids.