Ultrasonic “Shadowing”

We in the ultrasonics industry have long been aware of an effect which is sometimes called “ultrasonic shadowing.”  In general, this is what happens when parts being cleaned are positioned in such a way that parts cast an “ultrasonic shadow” which prevents parts in the shadow from being effectively cleaned.  This phenomenon, although we know …

Ultrasonic Performance – Ceramic Ring Test – Post Script

I usually try to make sure I’ve done my research prior to posting a blog.  As I was thinking about the post about the ceramic ring test, however, it occurred to me that there are a couple of variables that I had not previously considered – – the pencil and the means of applying the markings to the …

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 …

Is it Viscosity or is it Surface Tension??

Viscosity and surface tension are properties that are often intuitively linked to one another.  Because these properties are of primary importance in cleaning it will be worth the while to understand them a bit better. Surface tension is the property of a liquid that exists at the interface of the liquid with another media (usually …