Nex Flow style of air flow amplifiers have been around since the early part of the 20th century and over the years have grown in use because of their ability to reduce the energy required for blow-off and cooling utilizing compressed air. They come in various forms from air knives (linear versions), split units or air wipes for extrusion blow-off, small ones in cone shaped or similar shaped “nozzles”, and in annular form such as small ones (called jets) or larger ones (labelled as air amplifiers or air movers). The annular units also create a small vacuum and can be used to convey light materials or vent gases and fumes.
The technology has not changed very much since the original units were created although the data that describes them seems to have changed. Some manufacturers have come up with special shims (that maintain the air exit gap) or shapes that claim to improve amplification but with data that sometimes seems to defy science. Physics however does not change. But the temptation to make ones product look better than others, over time, can yield results that may not be a usable engineering guide. In fact, inaccurate data can have occasional negative consequences.
We had one confused customer contact us who needed an accurate “air flow amplification” figure. He was looking at various competitors who had the same high figures but they did not make sense to him. The figures on some web sites showed both high flow amplification and high velocity which did not make sense. (Some just showed air amplification indicating a high probability that the claimed figure was just copied). As air flow is “amplified” it is done by drawing in atmospheric “still” air. As the flow increases, the velocity must go down. It is only reasonable that the greater the amplification, the lower the velocity must become. That is a physical fact. Yet as he searched several different sites he found no comfort in a claim that did not make sense. He especially questioned these sites engineering and sales expertise, publishing data that was obviously copied from others without any thought to validity.
Nex Flow has accurate test data for amplification for much of its product range with extrapolations made when necessary within engineering validity and guidelines provided for their use. Flow, velocity and force measurements with accurate instruments have been used to provide data that can be used with confidence. When you look at the engineering data supplied by companies you should always question it.
Nex Flow prides itself on providing usable data and competent support with quality product at a fair price. Technical competence and quality data that reflects reality can save the customer a lot of time and cost. Where Nex Flow is superior over low cost knock-offs and high priced “old” suppliers, has been in quality manufacturing techniques and materials to actually improve performance and product life.
For details call Nex Flow at (416) 410-1313
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