I believe that Doug is referring to the rarefaction and compression phases of the ultrasonic wave in the cleaning solution.
- Steve N http://www.blackstone-ney.com/pdfs/T_Fundamentals.pdf "In elastic media such as air and most solids, there is a continuous transition as a sound wave is transmitted. In non-elastic media such as water and most liquids, there is continuous transition as long as the amplitude or "loudness" of the sound is relatively low. As amplitude is increased, however, the magnitude of the negative pressure in the areas of rarefaction eventually becomes sufficient to cause the liquid to fracture because of the negative pressure, causing a phenomenon known as cavitation. Cavitation "bubbles" are created at sites of rarefaction as the liquid fractures or tears because of the negative pressure of the sound wave in the liquid. As the wave fronts pass, the cavitation "bubbles" oscillate under the influence of positive pressure, eventually growing to an unstable size. Finally, the violent collapse of the cavitation "bubbles" results in implosions, which cause shock waves to be radiated from the sites of the collapse. The collapse and implosion of myriad cavitation "bubbles" throughout an ultrasonically activated liquid result in the effect commonly associated with ultrasonics. It has been calculated that temperatures in excess of 10,000°F and pressures in excess of 10,000 PSI are generated at the implosion sites of cavitation bubbles." -----Original Message----- From: M. G. Devour [mailto:mdev...@eskimo.com] Sent: Wednesday, June 23, 2010 11:13 AM To: silver-list@eskimo.com Subject: Re: CS>liposomes & ultrasonic cleaners I think some clarification might help, "polo." Are you saying the US cleaner cycles between low amplitude and high amplitude, or switches between two different oscillator frequencies? The switching, whatever it is, you imply takes place at the 60 hz line frequency, which would certainly simplify circuit design. Your use of the word 'phase' was just to refer to the two states the drivers switch between, right? Sometimes you have to read a little deeper between the lines, Marshall. <grin> Mike D. > Ok, thanks for that info, but nevertheless, this tidbit does not change > the fact that ultrasonic cleaners are designed to have a low and high > phase. How can a liposome be immune from rupture, by the tough > phospholipids membrane when compared to the ordinary bubble?? > > doug > > > ----- Original Message ----- > > 50/60 Hz is the line frequency the unit is specified to work with, > > what comes in the power cord. That is on the low end of the audio > > spectrum, not the high. Cleaners typically run between 20 and 30 KHz, > > which is above the range of hearing. The movement is basically > > sinusoidal, thus the amount of time above the baseline is equal to the > > amount under the baseline. The word phase in such a situation would > > refer to the difference in the angle between two waves and does not > > apply to these cleaners at all. > > > -- > The Silver List is a moderated forum for discussing Colloidal Silver. > Rules and Instructions: http://www.silverlist.org > > Unsubscribe: > <mailto:silver-list-requ...@eskimo.com?subject=unsubscribe> > Archives: > http://www.mail-archive.com/silver-list@eskimo.com/maillist.html > > Off-Topic discussions: <mailto:silver-off-topic-l...@eskimo.com> > List Owner: Mike Devour <mailto:mdev...@eskimo.com> > > [Mike Devour, Citizen, Patriot, Libertarian] [mdev...@eskimo.com ] [Speaking only for myself... ]
