Filters do not last forever. In the course of doing its job, a filter becomes progressively more resistant to the flow of liquid. As this happens, flow is reduced and, as we’ve mentioned before, this process may even be accelerated by the fact that the partially blocked filter retains smaller and smaller particles. The price of … Continued
For any filter to be effective, the liquid being filtered must circulate or re-circulate through the filter in an efficient way. In a spray system, the cleaning or rinsing liquid usually returns from the filter directly to the spray head(s). This means that the liquid spray used to clean or rinse is as good as … Continued
Removing foreign particles from surfaces is the target of many cleaning operations. The spectrum of the definition of particles as contaminants is very broad and encompasses size, number, shape and composition. Because of the diversity of the nature of particles, the methods to detect and quantify them are diverse as well. Some particles are easily seen with … Continued
Ultrasonics is generally described as the technology of sound above the range of human hearing. The use of the term “sound,” however, is questionable since “sound” would imply something we (humans) can hear. It all comes down to the question asking, “If a tree falls in a forest and there is no one there to hear … Continued
Before I start applying all of our new knowledge about sound to a discussion of ultrasonics, I thought I would interject this little tidbit of useful information about power configurations. Despite the fact that most companies employ skilled electricians, many of the people involved in specifying and designing cleaning (and other) equipment that uses electrical … Continued
Previous blogs have introduced the phenomenon of resonance. In fact, most objects can resonate at more than one frequency and in multiple modes of vibration. This blog will concentrate on resonance at multiples of the the fundamental frequency. These are “harmonics” of the fundamental frequency. A good model to demonstrate the principle of resonance at multiples … Continued
The way in which sound sources operating at the same frequency combine to produce constructive and destructive intereference was discussed in a preceding blog. In today’s blog, we will explore how sounds of two different frequencies combine to produce beat frequencies. Two sound sources operating in phase at the same frequency produce reinforcement or constructive … Continued
Sound waves produced by multiple sources, or even within a single source in some cases, interact with one another to produce a variety of interesting and useful results. These interactions are commonly referred to as “interference” but one should not automatically conclude that this kind of interference is in any way related to the interference … Continued
The speed at which sound travels through a sound conducting media varies depending on the media. In general, sound travels faster in liquids than it does in gasses. Solids are the best conductors of all beating out both liquids and gasses. The speed at which sound travels through most materials depends on several variables including … Continued
In a preceding blog I explained how sound waves are produced by a vibrating or pulsing source. Today, I want to take a few minutes to talk about the way sound waves travel through a sound conducting medium and reflect from surfaces. Many years ago in high school physics class, I was taught that sound waves … Continued
