Henri Coanda and his Effect on Compressed Air

Henri defined the Coanda Effect – the tendency of a jet of fluid emerging from an orifice to follow an adjacent flat or curved surface and to entrain fluid from the surroundings so that a region of lower pressure develops.

Compressed air flows through the inlet (1) to the Full Flow (left) or Standard (right) Air Knife, into the internal plenum. It then discharges through a thin gap (2), adhering to the Coanda profile (3) which directs it down the face of the Air Knife. The precision engineered & finished surfaces optimize entrainment of air (4) from the surrounding environment.

Henri-Marie Coanda (1885-1972) discovered the Coanda Effect in1930. He observed that a stream of air (fluid) emerging from a nozzle tends to follow a nearby curved surface, if the curvature of the surface or angle the surface makes with the stream is not too sharp. For example, if a stream of fluid is flowing along a solid surface which is curved slightly from the stream, the fluid will tend to follow the surface.

A number EXAIR products are designed to utilize the Coanda Effect and aid their performance. In some products, the Coanda Effect aids to create an amplification area where additional ambient air is drawn into the total airflow to increase total volume of air upon a target. This creates a more efficient and effective product. Also, since not as much compressed air is required, the noise levels decrease for products like EXAIR’s air knives, air nozzles, air jets and air amplifiers. EXAIR has been successful with positive impact for compressed air energy savings and noise reductions helping us meet or exceed OSHA Standard 29 CFR-1910.95 9(a) Maximum Allowable Noise Exposure.

Please contact EXAIR with regards to our Intelligent Compressed Air Products. We can help you with your next cooling, blow-off, drying or any compressed air needs.

Eric Kuhnash
Application Engineer
Email: erickuhnash@exair.com
Twitter: @EXAIR_EK

1- Spoon Coanda image- https://creativecommons.org/licenses/by-sa/2.5/deed.en

EXAIR’s Vac-U-Gun is THE Ideal Maintenance-Free Handheld Vacuum for Operators

Do you have workstations that require periodic cleaning and are tired of replacing electric vacuums? EXAIR’s Vac-U-Gun is a simple to use low-cost solution to a wide variety of industrial housekeeping issues. It’s constructed of a durable die-cast material and has no moving parts that’ll ever wear out or need to be maintained. Currently, EXAIR is running a promotion on the Industrial Housekeeping Products that includes a FREE Vac-U-Gun with any purchase of an Industrial Housekeeping Vacuum System.

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Vac-U_Gun cleaning up shavings after a sawing operation

In addition to being easy to use, the Vac-U-Gun is also more efficient than ordinary blow guns. By injecting a small amount of compressed air through directed nozzles, a vacuum is then produced on one end and a high output flow on the other. The amplified outlet flow through the Vac-U-Gun is 12 times the compressed air consumption of the gun.

The Vac-U-Gun is capable of both vacuuming material, as well as being operated as a blow gun. In vacuum mode, the work surfaces can be easily cleaned by vacuuming the debris away rather than blowing it off of the surface. Rather than simply moving the material around the shop floor, it can be contained and transferred to a waste receptacle using the 10’ vacuum hose, or straight into the filter bag.

Switching from vacuum mode to blow mode can be achieved in just a matter of seconds. To change the Vac-U-Gun from vacuum to blow mode, simply remove the threaded cap and change the orientation of the generator inside. Since the Vac-U-Gun has a large 1-1/4” diameter air outlet, it covers much more surface area in less time compared to traditional air guns. This can help to reduce the time needed for a variety of different blowing, cooling, or drying applications. Due to the nature in which the Vac-U-Gun entrains ambient air, it allows for more force and flow through the gun at a minimal compressed air consumption.

vac u gun kits

The Vac-U-Gun system is available by itself, or in one of three different kits. It can be used with or without the 10’ (3m) vacuum hose or the filter bag. Various vacuum accessories are included in the kits to accommodate a variety of different materials and applications. If you’re looking for a versatile gun that can help boost productivity in a number of applications within your facility, look no further than the Vac-U-Gun.

Tyler Daniel
Application Engineer
E-mail: TylerDaniel@exair.com
Twitter: @EXAIR_TD

Easily Vacuum Fine, Dusty Materials with EXAIR’s Heavy Duty HEPA Vac

Naturally, spring is the time of year that we roll up our sleeves and do some of the deep-cleaning we’ve been putting off all winter. Lucky for you, EXAIR has an entire line of Industrial Housekeeping Products that’ll get your shop cleaned up for spring. With no moving parts to wear out and no electrical requirement, these products are Built to Last. For applications requiring you to vacuum very fine or dusty materials, look no further than EXAIR’s Heavy Duty HEPA Vac.

Electrically powered vacuums or shop vacs are not designed to be operated in a rugged industrial environment. Filters clog, motors wear out, and you find yourself frequently replacing them. EXAIR’s Heavy Duty HEPA Vac has NO moving parts to wear out, doesn’t require maintenance, and needs nothing but a source of compressed air to operate. A static resistant hose also prevents painful shocks when working with dry, dusty materials.

The vacuum generator is constructed of a hardened steel alloy designed to be resistant to abrasion and delivers a powerful vacuum level of -60” H2O at 80 PSIG. The lever lock drum lid fits any open top 30, 55, or 110 gallon drum. Moving the system from one drum to another can be done quickly, allowing you to keep different materials separate for recycling. Recycling companies will pay a premium for pre-sorted materials, allowing you to get more out of your otherwise scrap material. It can be used with any open head steel, fiber, or plastic drum in good condition (ANSI Standard #MH2-2004).

If you don’t have a spare drum available, not to worry! EXAIR also sells a Premium Heavy Duty HEPA Vac System that will include either a 30, 55, or 110 gallon drum and dolly.

The HEPA Vac works by injecting compressed air at 80-100 PSIG through the air inlet (1) and into an annular plenum chamber (2). It is then injected into the throat through precisely directed nozzles (3). These jets of air create a vacuum at the intake (4) which draws in material through the generator itself (5), directing it into the bottom of the drum. The airflow is passed first through a pre-filter to trap larger particles, and then through the 0.3 micron HEPA filter, trapping any airborne particles. It is then exhausted through the vent in the top of the drum lid (6).

You wouldn’t use a hammer to try and drive in a screw, so don’t try and force a shop vac or electric vacuum to deal with these harsh materials. Get yourself the right tool for the job and give an EXAIR Vac a try. With a 5 Year Built to Last Warranty, there really is no comparison. Act fast, between now and April 30, 2022 we’ll include a FREE Model 6492 Vac-u-Gun System to any US and Canadian order.

Tyler Daniel
EXAIR Corporation
E-mail: TylerDaniel@EXAIR.com
Twitter: @EXAIR_TD

Benefits of Working with EXAIR

30 Day Guarantee

Consider EXAIR as the source of your problem solving products for the following reasons. Our Application Engineers are waiting for your call, e-mail or live chat. They have over 70 years manufacturing experience between them and have experience with an impressive number of different industries and process problems. Add our customer service staff to that mix and you will experience orders that are shipped the same or next day (orders received by 2pm EXAIR time ship same day), with a fast and accurate order confirmation. EXAIR shipped products on-time 99.8% in 2021, and we continue that into 2022.

Our website and catalog include 16 problem solving product lines and thousands of products, technical data, photos and drawings to help you with your project. When reviewing our website or catalog, chances are you will find the answers to some of your industrial/production problems. Our catalog products are stock items, so in most cases we will process and ship orders the same day! Having the capability to get our products to your facility allows you to begin familiarizing yourself with our product(s) and perform trial(s). Since we manufacture these products locally, in Cincinnati, OH, we have the ability to make custom solutions if any of our stock products do not meet your needs.

EXAIR has competitive prices but you will also see cost savings from the efficiencies you realize with our Intelligent Compressed Air Products. Reducing your SCFM usage will decrease your energy cost. Our products also come with EXAIR’s 5 year Built to Last Warranty!

EXAIR leads the way in standards compliance by making certain our products meet the standards set forth by many organizations. You will see CE, RoHS, REACH, Conflict Mineral Free and OSHA compliance are common for our products. When considering safety, our products meet or exceed OSHA Standards 29 CFR-1910.95 (a) maximum allowable noise exposure and OSHA standard CFR 1910.22 (b) harmful dead end pressure.

Please visit www.EXAIR.com or request a catalog.

Eric Kuhnash
Application Engineer
E-mail: EricKuhnash@EXAIR.com
Twitter: @EXAIR_EK