Cavitation test

[Omega_0]

A very good start !
Keep it up.

I believe plastic (or any material) is not a problem here. There needs to be sufficient pressure and RPM to see the effect. The tiny gap between the rotor and the outer case is also important.
The outer cylinder needs to be stronger and stiff. Perhaps you can print it too.

[DreamThinkBuild]

Hi Wings,

Thanks again for all the information, very helpful. Is there a design that uses the incoming water pressure to run the rotor?

Hi Omega_O,

I'm thinking of some kind of garden hose attachment with a constricting passage way to increase pressure but also driving an impeller which will drive the rotor, all in one. You're right printing the cylinder would probably be best it would allow for very tight tolerance.

@All,
Another test project from this patent:

3467179: Recirculating Heating Device
http://www.google.com/patents/US3467179

The measurement angles for the curve was B2=22 degrees at top and B1=150 degrees on bottom. It measures 140mm (5.5") diameter.

This is the first big print with the printer. It took four hours and thirty minutes to print, not bad. It would've taken me days to do this by hand and probably fail. It has some rough areas in the print but was amazed the fins came out nice and sharp.

A little testing in an inverted aquarium showed a slight increase in temperature (1-2degrees) but very slow at 2000 rpm. It does pump out air pretty quick and makes a nice whirlpool when driven in a bucket of water. Need to do some more tests with it.