When a sound wave encounters an object or discontinuity in the sound conducting medium, at least part of the sound is reflected. The way the sound reflects depends in large part on the rigidity of the reflecting surface. If the object is hard, like a substantial piece of metal, the wave reflects as shown below. …
I’ve made reference in the blog before to the fact that some surfaces are good candidates for ultrasonic cleaning while others are either difficult or impossible to clean. In general, surfaces that are hard (metal, glass) are easily cleaned using ultrasonics while softer surfaces (rubber, soft plastic) resist ultrasonic cleaning. The reason has to do …
The final type of weir I’ll discuss in this series is the four-sided overflow weir in which liquid overflows all four sides of a process tank. This type of weir is normally found in equipment designed for “precision cleaning” applications and most commonly in rinses where efficient particle removal is a major consideration. The theory behind …
The concept and purposes of an overflow weir are pretty simple but making them perform for maximum benefit can be a challenge. For the best performance of a weir used in a skimming application, liquid should overflow the entire width of the weir. An area of stagnation is formed behind an area where there is no …
Overflow weirs have specific purposes as they are utilized in industrial cleaning equipment. Also, as one might expect, there are several manifestations of the overflow weir which perform various functions. A simple “standpipe” is a form of weir as is a fitting on the side of a tank located just below the desired liquid level. …
Overflow weirs are common features of industrial cleaning systems. Simply, a weir is much like a dam that holds back a river to form a lake. In the case of a cleaning system, the “lake” is usually a tank of liquid. The “dam” is formed as a portion of the lip of the tank is …
Previous blogs have discussed the importance of rinsing as part of the overall cleaning process. Because of its importance, many schemes have been devised to assure that parts are adequately rinsed after cleaning. Most of these schemes embrace the “more is better” concept which often leads to overkill as there is often no practical way …
I have stressed the importance of temperature to cleaning processes many times in previous blogs. This blog will discuss the heat source options for achieving and maintaining the temperatures required for effective cleaning. Electric – Electric heat is, without a doubt, the most prevalent heat alternative used for cleaning applications. This is because electric heaters are relatively inexpensive, relatively small, …
How Much Heat? – It is common for the design engineer to calculate the heat requirement for the tanks of a cleaning system based on the tank volume, the target operating temperature and the desired heat-up time from ambient temperature to operating temperature taking into account, of course, heat losses through the tank walls and …
Meaningful temperature measurements depend on the selection of the proper sensors and controls and the proper placement of sensors to accurately measure the targeted temperature. For example, it was previously stated that bimetallic sensors, in most cases, ultimately sense the temperature of air around them. This makes bimetallic sensors a good choice for measuring air …
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