Maximizing Cavitation to Heat Water Efficiently Without Electricity

AI Thread Summary
The discussion focuses on finding an efficient method to heat 600 ml of water using cavitation without electricity or non-human power. The main questions raised are whether cavitation can generate significant heat in a short time and how to maximize its effectiveness through design choices like tube diameter and screw length. While some suggestions include using a stationary bike or hand-crank devices to create agitation, the consensus leans towards skepticism about the practicality of achieving meaningful heating through cavitation alone. High RPM is emphasized as crucial for cavitation, but participants generally consider the effort to be largely ineffective. Overall, the conversation highlights the challenges and limitations of using cavitation for water heating.
TromboneNerd
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I need to find the most efficient way to each 600 ml of water without using an electric heat source or any non human power. I thought i would use a combination of agitation and cavitation, with a screw with lots of "dimples" that create the pockets of low resistance that would create cavitation inside a tube. I can't find any information on cavitation other than what it is on a basic level so i have a few questions.
1) is this even worth it? is the heat caused by cavitation going to be significant enough in such a short time?
2) if it is, how can i maximize it? Should i use a narrower tube with a longer screw to spread the water out? or should i have a thicker tube so i can maximize the surface area of the screw blades, maximizing cavitation?

though I'm in high school, I've studied into multivariable calculus so if you have any equations whatsoever, please share them no matter how mathematically complex. any help would be greatly appreciated.
 
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Get on a stationary bike with an alternator/dynamo, and put a resistor in the water. Get an eggbeater with a crank, and modify it to increase turbulence. Put the water in a cannister, pump the pressure in the cannister up to a high pressure, then let it out through a very fine seive (like a porous plug). Get a hand-crank transfer pump and do the same thing by recycling through pump.

The stationary bike should generate 100 watts (~1/8th HP) for 30 minutes.

Bob S
 
I want to create my own idea. that's where the fun is. I'm looking for helpful information about cavitation principles and water heating in general, not a pre-made design to follow, though I appreciate the effort.
 
The main thing to consider is conservation of energy. The details of how drag is generated are less important than the torque and rpm themselves.
 
1) is this even worth it? is the heat caused by cavitation going to be significant enough in such a short time?

no.



2) if it is, how can i maximize it?

high RPM is necessary to maximize cavitation...but it's a useless exercise...

Try reading here for possible ideas...
http://en.wikipedia.org/wiki/Heat
 
Thread 'Thermo Hydrodynamic Effect'

Thread 'Thermo Hydrodynamic Effect'

Vídeo: The footage was filmed in real time. The rotor takes advantage of the thermal agitation of the water. The agitation is uniform, so the resultant is zero. When the aluminum cylinders containing frozen water are immersed in the water, about 30% of their surface is in contact with the water, and the rest is thermally insulated by styrofoam. This creates an imbalance in the agitation: the cold side of the water "shrinks," so that the hot side pushes the cylinders toward the cold...
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