Anyone hear about it, please tell me if you know how it works ?

http://www.ied.edu.hk/has/phys/phydemo/sd_wa/utrav.htm

What happen to the bottle in this link above ?

Thanks so much !

To clean what, jewelery?

 

Oh that.

Strangely, there was no link when I wrote that.

 

It has a piezoelectric transducer in it. When a voltage is applied, the piezoelectric material oscillates and emits sound waves. If you want to know more, you can easily Google piezoelectric material, piezoelectric transducer or ultrasonic cleaner. The sound waves put the molecules in the soda in motion.

but ... how it do cleaning, how can it clean dirty substances by sound waves (let them in motion but what next ?) ?

thanks !!!

The sound waves shake the dirt off.

At least part of the effect is this.

http://en.wikipedia.org/wiki/Cavitation

The sound waves simply loosen the bonds that hold the material (dirt in this case) in place.....by vibration.....as the ancient proverb states.....shake it up baby, twist and shout....shake it hard and long enough and it will come loose.

 

Read please......

http://en.wikipedia.org/wiki/Ultrasonic_cleaning

thanks !!! I read your links and understand some

uhm ... could you tell me why sometimes I see bubbles appear in the surface of a object that surrounded by liquid ?

It is degassing the solution.... It works very well for that purpose and is often used to degas solvents.

thanks so much