|About Ultrasonic Cleaning...
‘$OUND ADVICE’ about ~focusonics~
~ WHY WE NEED TO DE-GAS a SONIC CLEANING BATH ~
When any ultrasonic cleaning bath is first filled with fluid, effective cleaning activity will not be apparent until certain criteria have been satisfied.
The process generated by ultra-high frequency sound waves passed through a solution (cavitation), requires a totally inert liquid, free of bubbles any larger than those formed by the ultrasonic energy. De-gassing is the process where these gas/air bubbles present in the liquid, are removed.
- Cleaning solution has been added
- De-gassing has taken place
- Liquid is at an optimum temperature
It can be noticed that when a beaker is filled from the cold water domestic supply, bubbles are present which rapidly rise to the surface. These visible bubbles are large enough to contain sufficient buoyancy to assist their progress upwards through the liquid until expiring on the surface.
The bubbles of gas are introduced into the water in several ways. By chemical processes in water treatment, cavitation by the pumping stations, contraction and expansion of water delivery pipes, and microbiological activity.
Many millions of smaller, less visible bubbles are also present in the water and held in suspension by surface tension. These will only slowly disperse, possible over several hours. If the surface tension is reduced by the addition of detergent based cleaning fluid and mild heat, then the bubbles will disperse far more rapidly When ultrasonic energy is introduced, in some cases in a matter of seconds only.
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