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An improved eductor-mixer system in which pressurized working fluid is discharged through a cylindrical annular nozzle as a translational high speed jet flowing longitudinally past a end of a solute inlet tube into a tubular discharge passage having a uniform inner diameter greater than the outer di

An improved eductor-mixer system in which pressurized working fluid is discharged through a cylindrical annular nozzle as a translational high speed jet flowing longitudinally past a end of a solute inlet tube into a tubular discharge passage having a uniform inner diameter greater than the outer diameter of the annular nozzle, for generating a vacuum thereby to positively draw a pressure transportable material such as a granular, powdered, or other particulate solid, or a liquid or a gas, through the solute inlet tube and into the tubular discharge passage for mixing with the working fluid to form a dispersion.

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1. In an eductor-mixer system consisting of an eductor body with a passage extending therethrough for the flow of a pressurized working liquid from one end of the passage, constituting an inlet end, to the other end of the passage, constituting a discharge end;an annular insert within said passage a

1. In an eductor-mixer system consisting of an eductor body with a passage extending therethrough for the flow of a pressurized working liquid from one end of the passage, constituting an inlet end, to the other end of the passage, constituting a discharge end;an annular insert within said passage and adjacent the discharge end; a solute tube of smaller diameter than the diameter of said passage, said solute tube extending from outside said eductor body into said eductor body with the inner end of said solute tube being substantially coaxial with respect to said annular insert and with the inner end of said solute tube terminating substantially coplanar with the downstream face of said annular insert; a discharge tube connected to said body downstream from said insert; and said solute tube and said annular insert opening defining an annular nozzle, said pressurized liquid, upon flowing through said annular nozzle undergoing a substantial increase in velocity so as to generate an area of low pressure within said discharge tube downstream from said annular nozzle, said solute tube being adapted for the conveying of a flowable material which can be a granular, powdered, or other particulate solid, or a liquid or a gas, therethrough for mixing with said pressurized working liquid downstream from said annular nozzle; wherein the improvement comprises of: said solute tube in the region of said annular nozzle having a uniform cylindrical outer surface defining an inner surface of said annular nozzle; and said inner surface of said annular insert defining an outer surface of said annular nozzle, said annular nozzle inner and outer surfaces defining a conical upstream entrance converging to a uniform cylindrical passage opening coaxial with said solute tube, so as to maximize the longitudinal velocity component of the working liquid as it emerges from said annular nozzle into the discharge tube.