Maximizing Ultrasonic Energy Transfer

In ultrasonic cleaners, sound waves (vibration) originating from ultrasonic transducers must be efficiently transmitted into the cleaning liquid where they create cavitation bubbles which implode to enhance cleaning.  The weak links in the path from the transducer to the cavitating liquid are typically the  locations or “interfaces” where vibrations must be transmitted from one vibrating …

Ultrasonic Power – Reaching the Limits?

Ultrasonic power has been a topic of much discussion ever since ultrasonic technology was first used for cleaning nearly a century ago. The quest has always been for more ultrasonic power, the thought being that higher power would produce better cleaning results.  As I have discussed earlier, higher ultrasonic power typically requires an increase in the amplitude …

Questioning Particle Generation Due to Cavitation Erosion as a Source of Contamination

Ultrasonic cleaning is widely used for removing particles from surfaces.  It is generally agreed that the high energy of implosions of cavitation bubbles break the bonds holding particles to the surface being cleaned and that liquid motion (streaming) carries the particles away once they have been dislodged.  However, it is also well known that ultrasonic cavitation …

Surface Tension and/or Wettability

A few days ago, I sat down to write what I thought would be a simple explanation of surface tension and how it is measured in the laboratory (a blog which will be published shortly if I can figure all of this out).  In doing the normal background research, however, I started to see contradictions …

Ultrasonic “Double Boiler”

Maximum ultrasonic performance requires the most efficient transfer of ultrasonic vibrations from the ultrasonic transducers to the liquid in the process tank.  This is generally accomplished by applying ultrasonic transducers directly to the exterior surfaces of a tank containing the process liquid.  Transducer attachment techniques favor attachment to metals like stainless steel.  What if the chemistry to be used …

Ultrasonic Performance – Ceramic Ring Test

Other than to say that there is no perfect, infallible way, the blog has not addressed assessing ultrasonic performance.  In an earlier blog, I did suggest that any of many methods are appropriate to compare ultrasonic performance of an ultrasonic system from day to day but that no further inference should be made. One test that’s …

Ultrasonic Machining – A New Use for Ultrasonics?

Over the years, there have been several anecdotal references to otherwise unexplained changes in the properties of surfaces exposed to ultrasonic energy in a liquid.  In some cases, it would make sense that the change was due to increased cleanliness.  In others, however, the benefit of cleanliness alone would seem questionable.  One incident in particular …