An earlier blog discussed the mechanics of ultrasonic removal of soluble contaminants. In many cases, however, it is not the soluble contaminants but, rather, particles that are the primary target of ultrasonic cleaning. Particles of concern range from a fraction of a micron to several hundreds of microns in size. Something larger than a BB …
With the availability of ultrasonic cleaning equipment operating at frequencies from 20kHz up to over 250kHz and the capability to use more than one frequency in a single piece of ultrasonic cleaning equipment, users inevitably and rightly question the optimum frequency or frequencies for their cleaning applications. The popular and most touted notion is that …
Note – Before we start, there is a nomenclature conundrum when it comes to the term “ultrasonic transducer.” Through convention, transducer elements, the individual devices that produce ultrasonic vibrations (much like an individual radio speaker), are commonly called “transducers.” A number of transducer elements working in parallel constitute a transducer array but may be called …
Ultrasonic cavitation and implosion provide a unique benefit in cleaning unmatched by other means. So much so that ultrasonic cleaning is often used as a benchmark to judge the effectiveness of other cleaning techniques. The major factors in cleaning are Time, Temperature, Chemistry and Mechanical Effect or Motion (TTCM). There are other acronyms for these …
After God knows how many years of looking at that one image of a cavitation bubble presented endlessly with different color variations etc. to “freshen it up” there has emerged some exciting new footage of actual cavitation bubble implosion! Now, as a start, I don’t think these bubbles, at least the first ones, are the …
A preceding blog discussed the possible effect of too many available sites for the formation of cavitation bubbles to the point that there isn’t enough energy available to grow a significant enough portion of them to sufficient size to implode. This leads to the question that the reverse may be possible as well. In short, …
In 2010, a patent was issued to Kaijo Corporation (US 7,726,325) for a method to efficiently and rapidly “degas” liquids. In short, the process involves passing a liquid through a restriction such as the narrowing of a pipe at a sufficient velocity that rarefication downstream from the restriction (ala Bernoulli’s principle) creates negative pressure to draw …
This discussion is a bit anecdotal in nature because my attempts to demonstrate the effects I describe in the following in the laboratory have been less than conclusive. But, the fact that I have seen them occur on several occasions over a period of more than 50 years gives it a degree of credence. By this time the …
I have talked about cavitation extensively in previous blogs. But what I have neglected to address through an omission on my part is the fact that all cavitation does not produce the effect needed to enhance cleaning – namely, the catastrophic collapse of the cavitation bubble in implosion. Before reading further, please take a minute …
Clean rooms are an integral and necessary part of many manufacturing operations. The goal of a clean room is to provide an environment without airborne contaminants including common dust, aerosols, particles and other contaminants that are suspended in the air everywhere around us. Although we are relatively unaware of these contaminants in our everyday lives, most …
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