Venturi Eductor Mixer

Venturi Eductor Mixer for my reef aquarium. Based on traditional eductor mixers typically used in tanks for mixing without equipment with moving parts.

Technical Design notes:
Eductor section is designed as a venturi nozzle per ISO 5167-1 (1991) pp. 28 & 37
Outlet diverging section has included angle of 8 degrees (typical of traditional venturi tube)
Inlet nozzle has inlet included angle of 21 degrees (typical of traditional venturi tube)
Annulus for outside flow, spacing between inlet nozzle and eductor section, has hydraulic diameter equal to inside diameter of inlet pipe.

Should produce 3 to 5 times more flow than a normal return pipe.

Supplied the OpenSCAD file. All you have to do is enter the return pipe inside diameter and outside diameter and the Beta, the ratio of return pipe inner diameter to inlet nozzle diameter, and alpha, the ratio of the return pipe inner diameter to eductor throat diameter.

Once assembled nozzle secured to return pipe that has been wrap