Ultrasonic Cavitation: Can I Produce Acoustic Cavitation?

  • Thread starter hamilton17
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In summary: Your project initially started with the goal of reducing bubbles in a liquid, but it has since evolved into something else.
  • #1
hamilton17
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Hi,

I was wondering whether I could practically produce ultrasound capable of producing acoustic cavitation. I tried an arduino module at 40kHz, but this did bot work, would a higher frequency work? If so, is there a practical way of achieving this?

Thanks in advance.
 
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  • #2
There is quite a lot of lit about acoustic cavitation - have you had a go getting hold of some?
It looks like your frequency is high enough but your intensity probably isn't.

A fairly typical setup would use 20kHz at 2kW.
i.e. http://www.hielscher.com/cavitat.htm
 
  • #3
I was wondering of there was a way to apply the ultrasound without submerging in the liquid, i.e positioning transducers very close to the liquid surface. Would this be possible?
 
  • #4
You need good sound coupling to the water. When waves encounter a barrier where the material media changes properties there will be some reflection. It's doable but keep in mind that you'll lose some power from reflections off the water's surface.
 
  • #5
In my estimation we cannot expect to induce cavitation by the application of the sound energy "very close to the liquid surface". As Okefenokee says, there is a BIG acoustic impeadance mis-match unlesss there is direct coupling. Hard to believe enough acoustic energy to cause cavitation could be forced across the transducer-air- liquid barrier. Why do sonograms require the "contact gel" to image a fetus?

Cavitation in physics is the formation of vapor bubbles of a liquid in a region where the pressure of the liquid falls below its vapor pressure. The extreme pressure reduction literally “rips” the water molecules apart and creates a bubble. This bubble contains gas that had been dissolved in the liquid. Cavitation bubbles can easily be seen near the tips of a rapidly spinning propeller under water. For a good description of hydrodynamic cavitation, see: http://en.wikipedia.org/wiki/Cavitation

Cavitation in liquids may also be caused when the low pressure portion of a powerful acoustic (sound) wave causes a bubble to form. When a cavitation bubble collapses it compresses the gas and vapor inside it to an extremely high temperature. This can be used to cause chemical reactions not possible without acoustic cavitation. Under some specific conditions the process will emit visible light called “sonoluminescence”.

An excellent technical paper authored by some of the original pioneers in the field is this:
“Acoustic cavitation and its chemical consequences”
By Kenneth S. Suslick, et al.
http://www.scs.illinois.edu/suslick/documents/philtrans99335.pdf

See these images for acoustic cavitation:
http://www.google.com/search?q=acou...QWiloCgAg&sqi=2&ved=0CD0QsAQ&biw=1333&bih=648

Suggested search terms you may use in Google searches to learn more:

hydrodynamic cavitation
physics of acoustic cavitation in liquids
acoustic cavitation ultrasound
sonoluminescence

Cheers, Bobbywhy
 
  • #6
So your project had turned from something you needed to remove the bubbles from to something you want to add bubbles to?
 

1. What is ultrasonic cavitation?

Ultrasonic cavitation is a physical phenomenon in which high-frequency sound waves create small bubbles of gas in a liquid, which then collapse and produce intense energy. This energy can be used for various applications, including medical treatments and cleaning processes.

2. How does ultrasonic cavitation work?

Ultrasonic cavitation works by using a transducer to emit high-frequency sound waves into a liquid. These sound waves create bubbles of gas that grow and collapse rapidly, producing energy that can break down materials or stimulate biological processes.

3. Can I produce acoustic cavitation?

Yes, anyone with the right equipment can produce acoustic cavitation. However, it requires specialized equipment, such as a high-powered ultrasonic transducer, and proper safety precautions should be taken to avoid potential hazards.

4. What are the applications of ultrasonic cavitation?

Ultrasonic cavitation has a wide range of applications, including medical treatments, such as liposuction and tissue regeneration, cleaning processes, such as removing dirt and contaminants from surfaces, and industrial processes, such as emulsification and particle size reduction.

5. What are the advantages and limitations of ultrasonic cavitation?

The advantages of ultrasonic cavitation include its ability to produce intense energy without the need for chemicals or heat, its non-invasive nature for medical treatments, and its efficiency in cleaning and processing applications. However, its limitations include the potential for damage to sensitive materials, potential safety hazards, and the need for specialized equipment and training.

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