Maximizing Cavitation to Heat Water Efficiently Without Electricity

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    Electricity Heat Water
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Discussion Overview

The discussion centers on the exploration of methods to heat 600 ml of water efficiently without using electricity or any non-human power sources. Participants are particularly interested in the role of cavitation and agitation in this process, as well as the design of a mechanical system to achieve this goal.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant proposes using a screw with dimples to create cavitation in a tube, questioning the significance of heat generated by cavitation in a short time frame.
  • Another participant suggests alternative methods involving a stationary bike with an alternator, a hand-crank eggbeater, and pressure systems to generate heat, indicating a preference for practical designs over theoretical exploration.
  • A participant expresses a desire to create a unique solution rather than follow existing designs, seeking information on cavitation principles and water heating.
  • One participant emphasizes the importance of conservation of energy and suggests that the specifics of drag generation are less critical than the torque and RPM of the system.
  • A later reply dismisses the potential effectiveness of cavitation for heating in a short time, asserting that high RPM is necessary but ultimately labeling the endeavor as a "useless exercise."

Areas of Agreement / Disagreement

Participants express differing views on the feasibility and effectiveness of using cavitation for heating water. While some explore the concept and seek to maximize its potential, others question its practicality and suggest alternative methods. The discussion remains unresolved regarding the viability of cavitation as a heating method.

Contextual Notes

Participants have not reached a consensus on the efficiency of cavitation for heating water, and there are varying assumptions about the necessary conditions for effective heat generation.

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
 

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