Creating controlled cavitation underwater (bubbles)

  • Thread starter fishflyguy
  • Start date
  • #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?
 

Answers and Replies

  • #2
Nidum
Science Advisor
Gold Member
2,990
850
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 ??
 
  • #3
could be i suppose
 

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