Aluminum Foil Test for Ultrasonic Performance – Potential Problems

Task At Hand – In a previous blog I declared that I am not a fan of the aluminum foil test for evaluating ultrasonic performance.  I question its validity and relevance on a number of fronts.  If my purpose here is to question my own skepticism, then I guess I should probably define the factors …

Aluminum Foil Test – Foil Perforation Mechanism

Until recently, I was only able to theorize about the mechanism involved in the perforation of aluminum foil by ultrasonic cavitation.  I no longer have to theorize! My theory had always been that perforation of aluminum foil was due to the repeated flexing of aluminum foil as cavitation implosions occurring on opposite sides of the foil …

Aluminum Foil Test

If you’ve heard of ultrasonic cleaning you’ve probably heard of the aluminum foil test.  The practice of putting a piece of aluminum foil into an ultrasonically activated tank of water probably began as a novelty demonstration.  The holes produced in the aluminum foil by the collapse of cavitation bubbles at least showed that something interesting …

Stainless Steel Compatibility

With its well-deserved credentials for chemical resistance and durability, stainless steel and particularly 316 grade stainless steel is a “go to” for the fabrication of ultrasonic cleaning tanks.  Although it performs well in most applications, there are still those where stainless steel has its limitations.  Stainless steel achieves its “stainless” characteristic by developing a very …

Ultrasonics – Near Field and BEYOND!

The term “near field” is not new to ultrasonic cleaning.  In general, it refers to cleaning parts in near proximity to the ultrasound source.  It is well known that increasing ultrasonic power density can produce improved cleaning results in many cases.  Increasing power density can be accomplished by reducing the size of the cleaning vessel to …

Comments on Ultrasonic Power

My recent blog, Are Ultrasonic Power Ratings Real?, prompted a response from my friend and colleague William Puskas.  Some of you may know Bill as the “Father of Sweep” as he was the first to implement frequency sweeping technology in ultrasonic cleaning equipment decades ago.  He is also the author of a significant number of …

Are Ultrasonic Power Ratings Real?

Nearly anyone who has been involved in the procurement of an ultrasonic cleaning system has come head to head with watts of ultrasonic power issues.  Variations of an order of magnitude or more are common in ultrasonic watts ratings from competitors selling equipment of otherwise similar size and capacity.  Despite the discrepancies, I don’t believe anyone …

The Effect of Physical Chemical Properties on Ultrasonic Performance

Successful ultrasonic cleaning processes utilize a combination of mechanical action provided by the formation and implosion of cavitation bubbles and  chemistry that dissolves and/or promotes the wetting and transfer of mechanical energy to dislodge the contaminants to be removed.  The interactions and effects of chemistry on the ultrasonic process obviously exist but are not well …

Ultrasonic Tank Squeal

If you work around ultrasonic cleaning tanks you have probably heard a tank “squeal.”  If you’ve never heard this, (1) consider yourself lucky and (2) be aware that a “squeal” is not the normal hissing sound associated with an operating ultrasonic tank but, rather, an extremely high amplitude sound at an audible frequency that can …