From the Wikipedia reference: "A venturi can also be used to mix a fluid with air. If a pump forces the fluid through a tube connected to a system consisting of a venturi to increase the water speed (the diameter decreases), a short piece of tube with a small hole in it, and last a venturi that decreases speed (so the pipe gets wider again), air will be sucked in through the small hole because of changes in pressure. At the end of the system, a mixture of fluid and air will appear."Tom Barr;10839 said:
Professor Myers;10840 said:A proper venturi is not as simple as a tapered pipe. There is a disproportionate difference in the angle of the taper IE: 90* input taper to 47* output to create a pressure differential to fascilitate the vacuum . This is merely an example as the taper is dependent on volume, and pressure.
Like wise there will also be a difference in the gas intake for Low pressure systems (Powerheads). IE: a quarter inch air intake might benefit from a .036" orifice on the leading edge of the air intake to compensate for lower static head pressure.
I'll provide a more specific example as time permits as I'm presently experimenting between proto-types designed specifically for use with powerheads, and Co2 induction. HTH. Prof M
For the record: The Mazzei Injectors are definitely worth the price, but are designed for high pressure sytems. Given their efficiency they still work splendidly for powerheads. Just not as well. A simple modification to the gas intake throat makes quite a difference, Though the machining is somewhat tedious.
Tom Barr;10847 said:As the gas is sucked into the vacuum of pressure differential, it is torn into smaller gas "apherons", their size are determined namely by the volume of gas being fed into the venturi through a small orifice and then the flow rips it further and prevents coalescing.
peterhaack;10899 said:Any Pics of your project?