Re: Cavitation as a useful tool

Dear Frogwatch:

On Mar 11, 12:00 pm, Frogwatch <ohara...@xxxxxxxxxxxxxx> wrote:
On Mar 11, 1:40 pm, "Raymond O'Hara" <raymond-oh...@xxxxxxxxxxx>
wrote:
....
Well, what about directing the ultrasonic transducers
so the cavitation occurred against an object.  This
could be used to clean the insides of pipes etc.

Yes, it does a great job on pump impellers... slowly chipping away at
the material of an impeller... roughing up the surface.

cavitation is the effect of the pressure change, kind of
like the difference in pressure between the top and
bottom of an airplane wing. its rather difficult to pass
this on. you can't direct such an effect'

Actually you can direct it by causing several transducers
to interfere constructively to produce a large amplitude in
one spot.  This is how single bubble sonoluminescence
experiments are done.  Not sure if it practical.

However, considering the production of UV light in the
bubbles, maybe this would be a good way to ozonate
water.

UV in water is used all the time, even ozone producing wavelengths.
Ozone is not the result... OH is. Some H2O2 as well...

 Typically this is done via UV lamps but it is mostly
a surface effect because the UV doesnt penetrate.
 The bubbles could produce ozone volumetrically.

*Not* ozone, but something else...

 The ozone is used to kill micro-organisms.  However,
ozone and O2- and OH form that can break down
various organic compounds and things like Carbon
tetrachloride , PCB and other halogenated stuff.

Much more energy efficient using UV lamps, activating TiO2, and
letting that attack the compounds whereever they are. Sonically
formed oxidizing compounds will not be limited to a few fractions of
milimeter depth from a UV lamp quartz sleeve... so turbidity will be
no issue. But it will be horribly inefficient.

David A. Smith
.

Relevant Pages

  • Re: hydrogen peroxide water treatment
    ... compounds in water to CO2 and H2O, ... Ozone and peroxide is "peroxone". ... the carbon spine once all the double carbon bonds are gone. ...
    (sci.chem)
  • Re: The odor from spoiled food
    ... Douse the inside with water and put an ozone generator output hose ... ozone goes after more compounds with water present. ... Depending on the ozone generator, 30 seconds to 30 minutes should be ...
    (alt.home.repair)
  • Re: Goldilocks Zone vs. Goldilocks Planet?
    ... dlzc writes: ... in compounds that are much more stable than ... continual source of ozone. ... --John Park ...
    (sci.astro)
  • Re: Goldilocks Zone vs. Goldilocks Planet?
    ... in compounds that are much more stable than ... continual source of ozone. ... David A. Smith ...
    (sci.astro)
  • Re: Cavitation as a useful tool
    ... cavitation occurred against an object. ... cavitation is the effect of the pressure change, ... However, considering the production of UV light in the bubbles, maybe ... The bubbles could produce ozone volumetrically. ...
    (sci.military.naval)