Project: Venturi Air Nozzle

thingiverse

The venturi air nozzle project can be used to teach physics and engineering concepts. A high-speed jet of air creates low-pressure suction, increasing the volume of airflow to more than in the jet alone. Originally designed to feed air into a charcoal-based foundry, this device has many other uses. Print Settings: Printer: Generic prusa i3 style Rafts: No Supports: Yes Resolution: 0.1mm (others may work) Infill: 100% Notes: I printed with 1.2mm shell. I used a 35% infill support to print the blocked nozzle and a 40% infill support for the open nozzle. (These are the settings I used to get the quality I was looking for, YMMV for your printer and intended use) How I Designed This: Design notes on this design from my engineering notebook I started with an inexpensive air blow gun and a 1" female PVC fitting. Using calipers, I got the main measurements and took notes as shown in my image. Next, I drew a half cross-section in Fusion 360. I used a half cross-section because I planned on revolving the section around the middle to create the round part. Then, I revolved the sketch around the middle axis. Next, I added supports for the now floating nozzle to connect it to the outer tube. Finally, I added some cuts into the blow gun adapter so the gun can snap in. After printing the first design, I realized my tolerance for the air gun snap was too tight and made a cut in the input end of the nozzle to make the air gun easier to plug in. Cross section for revolving: I included an image of the cross-section here. Materials Needed: air_nozzle_v3.f3d air_nozzle.stl air_nozzle_blocked.f3d air_nozzle_blocked.stl air_nozzle_cross_section.stl The following materials and items can be helpful with this project. compressed air source (could be an air compressor, bicycle pump with a surge tank, or other source?) Air hose with quick release ends Pocket Blow Gun with Industrial Coupler (example: http://www.harborfreight.com/Pocket-Blow-Gun-with-Industrial-Coupler-68262.html) ribbon, tissue paper, toilet paper, or smoke generator (dry ice maybe?) to help visualize air flow 1" PVC union joint any length of 1" PVC pipe to extend your outlet to give students more room to work (Note: longer you go creates more friction losses in your outlet) anemometer to measure air speed calipers, rule, or tape to measure things protection gear - eye protection!! and any other gear that might be a good idea. Project: Venturi Air Nozzle Venturi Nozzle Suction