Vortex vacuum cleaner nozzle with means to prevent plume formation

A toroidal vortex nozzle for guiding a volume of fluid flow comprising:

• an inner tube;
• an outer tube, said inner tube and said outer tube being concentric such that said inner tube and said outer tube form an annular duct, and further wherein said outer tube comprises at least one vent;
• and
• at least one flow straightening vane disposed within said annular duct;
• wherein said fluid flows out of said annular duct around an inner donut and into said inner tube.

A method of creating a recirculating toroidal vortex fluid flow comprising the steps of:

• providing a fluid flow into a first hollow member;
• providing a second hollow member disposed within said first hollow member;
• venting at least some of said fluid flow from said first hollow member;
• and
• guiding said fluid flow in a U-turn from said first hollow member around an inner donut and into said second hollow member.

A method of creating a toroidal vortex fluid flow of a substantially unit volume of fluid comprising the steps of:

• providing a first hollow member;
• providing a second hollow member coupled to the inner circumference of a toroid, said second member and said toroid disposed within said first hollow member;
• venting at least some of said fluid from said first hollow member;
• and
• guiding said fluid from said first hollow member to said second hollow member.