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I Creating controlled cavitation underwater (bubbles)

  1. Mar 9, 2016 #1
    Hello all- First post.

    I am curious if it is possible to create cavitation underwater with these specific criteria. I am basically using a venturi device that will be pulled underwater in saltwater. Is it possible to get the vapor pressure down low enough to boil water (make bubbles).

    I have done some rudimentary calculations and I got some Reynolds number in the 132,000 range which would be quite turbulent flow.

    Here are the parameters of my question:

    Venturi inlet diameter is .7500 inches (cannot change this....hopefully)
    Venturi throat is .0937 inches (3/32) in diameter. (this can diameter can change)
    The total length of venturi device is 1" 3/8"
    The Venturi will be operated at depths of 10 feet to 50 feet below the surface of salt water
    The Venturi will be operated in salt water with a temperature of 5 degrees C to 20 degrees C
    The Venturi device will be moving from 2-5 knots consistently underwater.
    3 knots is 1.543 meters/ second
    Venturi will be made of yellow brass.
    Optimum bubble diameter would be between 1/8" to 1/4"

    My two questions are:
    1. can I make consistent bubbles underwater?
    2. Specifically can I make NON-destructive cavitating bubbles with the above criteria?
     
  2. jcsd
  3. Mar 10, 2016 #2

    Nidum

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    Science Advisor
    Gold Member

    Cavitation , turbulence and simple bubble formation are really different things

    With set up described I doubt whether you would get any noticeable effect at all .

    To deliberately create cavitation you would need to use something like a badly designed powered propeller in a duct .

    To create bubbles in a more practical manner the easiest way would be bring down an air line from the surface .

    Is all this for a sea fishing application ??
     
  4. Jul 6, 2016 #3
    could be i suppose
     
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