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Author Topic: Cavitation test  (Read 19127 times)

Offline DreamThinkBuild

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Cavitation test
« on: August 20, 2012, 03:30:48 AM »
Hi All,

Had a weekend project of testing cavitation. Drew up the design based on different sources on the net. Mainly 45 degree angled holes leading to a cone shape end. Took 1 hour and 30 minutes to print, so gave me time to cook up a can of beans and have them for lunch. :)

This test was also to see if cavitation could be accomplished with plastic (LOL). I ran it off a drill with two speed settings 1000rpm and 3600rpm, tried both clockwise and counterclockwise. The wheel distance to the bean can was .5 mm using just tap water. I could've put oil but the ABS would probably melt.

In this design I didn't notice any minute heating (digital thermometer) with just one printed ring, most show more than one ring, I ran it until the drill motor got hot <5 minutes. Did learn that ABS plastic is pretty strong even when getting banged around at 3600 rpm (safety glasses and Kevlar butcher gloves were worn for protection).

If this doesn't pan out I'll stick some thin cylinder magnets in it and see if I can turn it into a magnet/pulse motor. :)

Attached is a picture of the wireframe to show the internal structure  and the printed part connected to drill.

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Cavitation test
« on: August 20, 2012, 03:30:48 AM »

Offline gotoluc

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Re: Cavitation test
« Reply #1 on: August 20, 2012, 04:13:20 PM »
Thank you DreamThinkBuild for taking the time to post your results even though they're not so positive. This will be helpful to others!

Luc

Offline wings

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Re: Cavitation test
« Reply #2 on: August 20, 2012, 07:17:39 PM »
test

http://www.fieldlines.com/index.php?topic=129151.0

important: rotor diameter - rotational speed - operating pressure

some suggestions in the patent

US 5188090

note pressure OUT less than pressure IN (important for cavitation)

RPM   5000   3460
rps   300000   207600
HP   5   7.5
watt   3676   5515
       
Rotor Diameter (inch)   7.3   10
Rotor Diameter (mm)   185   254
     
Tangential Speed (m/sec)   48.5   46.0
     
Pipe Diameter (inc)   0.5   0.75
Pressure IN "pounds"   75   65
Pressure IN (kgf/cm^2)   5.3   4.6
Pressure IN (Bar)   5.2   4.5
     
Pressure OUT "pounds"   60   50
Pressure OUT (kgf/cm^2)   4.2   3.5
Pressure OUT (Bar)   4.1   3.4
     
Temperature (F°)   300   300
Temperature (C°)   149   149
« Last Edit: August 20, 2012, 10:37:07 PM by wings »

Free Energy | searching for free energy and discussing free energy

Re: Cavitation test
« Reply #2 on: August 20, 2012, 07:17:39 PM »
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Offline DreamThinkBuild

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Re: Cavitation test
« Reply #3 on: August 21, 2012, 05:11:46 AM »
Hi Wings,

Thank you for that insightful information.

I see that you need a fair amount of pressure and wider diameter on that design. I wonder how much ABS plastic can take in pressure. :) I didn't have any real pressure as it was open ended. Might be able to use it as a friction(not cavitating) water heater but it would need more mass, using mineral oil instead of water.

This is one of the patents that I went off of.

US6910448: Apparatus and method for heating fluids
http://www.google.com/patents/US6910448

Offline wings

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Re: Cavitation test
« Reply #4 on: August 21, 2012, 09:15:24 AM »
Hi Wings,

Thank you for that insightful information.

I see that you need a fair amount of pressure and wider diameter on that design. I wonder how much ABS plastic can take in pressure. :) I didn't have any real pressure as it was open ended. Might be able to use it as a friction(not cavitating) water heater but it would need more mass, using mineral oil instead of water.

This is one of the patents that I went off of.

US6910448: Apparatus and method for heating fluids
http://www.google.com/patents/US6910448

40-70 PSI is typical house water pressure

IMO
- lower pressure is ok for cavitation but you have to introduce some variable restrictions in the INlet and OUTlet in order to test the best differential pressure

- cavitation bubbles starts when local pressure is below liquid vapor pressure and this is function of static and dynamic pressure (i.e. speed related - function of rotor diameter and rotational speed RPM) cavitation is the implosion of the vapor bubbles it happen when the sigma value is below 1.5

- ABS or plastic is good for short test


- use water no oil except you want to obtain biodiesel - http://hydrodynamics.com/   


- youtube
http://www.youtube.com/watch?v=UBxpn6odtcA&feature=player_embedded

- some useful formula for cavitation here:
http://www.calculatoredge.com/mech/cavitationno.htm

- some information on cavitation
http://web.mit.edu/hml/ncfmf/16CAV.pdf
http://www.flowserve.com/files/Files/Literature/ProductLiterature/FlowControl/Flowserve/FCENBR0068-00.pdf

Free Energy | searching for free energy and discussing free energy

Re: Cavitation test
« Reply #4 on: August 21, 2012, 09:15:24 AM »
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Offline Omega_0

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Re: Cavitation test
« Reply #5 on: August 21, 2012, 02:46:03 PM »
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.

Offline DreamThinkBuild

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Re: Cavitation test
« Reply #6 on: August 22, 2012, 12:05:01 AM »
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.

Free Energy | searching for free energy and discussing free energy

Re: Cavitation test
« Reply #6 on: August 22, 2012, 12:05:01 AM »
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