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

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

EXAIR’s Atomizing Nozzles for Decontamination Due to COVID-19

coronavirus-4957673_1920 (1)

At this time, countries across the world are all grappling with the constant change and disruption that is caused by COVID-19. As a worldwide supplier to manufacturers in a wide variety of industries, we’re seeing first-hand how important the manufacturing supply chain is. Many industries that we support including food, pharmaceutical, medical equipment, etc. are absolutely critical right now. EXAIR as a company is taking all necessary precautions to ensure that we can remain open to supply the manufacturers in these critical industries.

Manufacturers across the US and the rest of the world are re-purposing their facilities and production processes to manufacture medical supplies at a rapid pace. The situation evolves on a daily basis. The feeling is mutual among all of us, this entire situation is completely unprecedented and unlike anything we’ve experienced in our lifetime. I’ve recently spoken with numerous manufacturers and end users who are looking to utilize our products to help fight this pandemic.

One such product is EXAIR’s Atomizing Spray Nozzles. Designed to atomize fluids in a wide range of different spray patterns, they utilize a small amount of compressed air that mixes with the liquid supply to create a fine mist of atomized liquid. This makes them very effective in applications that utilize expensive paints, oils, or other liquids. Rather than wasting the expensive materials, the nozzle can be set to precisely dispense only what is necessary to achieve a successful application.

In the current situation, they’re being used for a range of applications for decontaminating rooms, personnel, and equipment. A customer utilizes the Model EF1010SS to perform a dry fogging process inside of residential and commercial rooms to eliminate mold, odors, and pathogens. For them this is a common process, but due to the concerns related to COVID-19 they’ve seen a dramatic increase in business related to pathogen removal. Using a two-step dry fogging process, the solution fills the entire volume of the space to remove any contaminants and prevent against microbial growth in the future. The nozzle provides a fine atomized mist that fills the entire space in a short amount of time. After a physical wipe down of all surfaces, a second solution is applied that prevents future microbial growth.

Atomizng Family

Another customer manufactures decontamination booths for personnel. They’re also noticing an increase in inquiries as companies look to decontaminate their employees upon entering the building. Utilizing (3) of EXAIR’s SF2020SS Atomizing Spray Nozzles, they’re able to spray a decontaminating solution to aid removal of pathogens from their clothing before it has an opportunity to spread around the office.

With the ability to produce a fine droplet size, the Atomizing Spray Nozzle is an ideal product to deliver the fine mist required for decontamination. If you have an application or process that could benefit from an EXAIR Intelligent Compressed Air Product please give us a call. We’re here, ready to help, as we all come together to fight this head on.

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

 

COVID-19 image courtesy of enriquelopezgarre from Pixabay

EXAIR Patented No Drip Atomizing Nozzles Improve Finishes, Save Liquids

EXAIR offers a wide variety of  Atomizing Spray Nozzles that can be used to coat, rinse or cool a surface. We manufacture (3) different types – Internal Mix, External Mix, and Siphon Fed – as well as 3 different sizes – 1/8″ NPT, 1/4″ NPT and 1/2″ NPT – all in 303ss construction, rated up to 400°F.

atomizing collage
142 distinct models. 8 different patterns. Liquid flow rates from 0.1 to 303 gallons per hour. If you’ve got a spraying application, EXAIR has an Atomizing Nozzle for you!

Today I’m going to focus on the Internal Mix nozzles with the patented No Drip Functionality.

The No Drip option eliminates the occurrence of post spray liquid flow that results in unwanted drips that can mar a finish on painted or coated surfaces.  Also, excess liquid loss is minimized saving on expensive materials like chemicals or coatings.  When the compressed air is shut-off, the No Drip nozzle positively seals off the flow, eliminating the chance for a drip or lost liquid. Only one compressed air line is needed, as the line to combine and atomize the liquid also provides the no drip operation and control. At the 41 second mark in the video below you can see the No Drip in Action!

The Internal Mix type operates under the principle that the air and liquid come together and mix ‘internal’ to the nozzle.  This type provides the finest atomization and smallest droplet size. The Internal Mix type of nozzle can be used with liquids up to 300 centipoise in viscosity.  Both the air and liquid sides are pressure fed.  The No drip Internal Mix Atomizing Nozzles are best for pressure fed applications not requiring independent air and liquid control.

No Drip Siphon Fed Round Pattern Atomizing Nozzle
No Drip Siphon Fed Internal Mix Round Pattern Atomizing Nozzle

The No Drip Atomizing Nozzles are available in (3) sizes – 1/8, 1/4, and 1/2 NPT – to provide a wide range of flow rates and pattern sizes.  The No Drip feature does not impact the flow rates compared to the standard models.  Minimum air pressure operation is 30 PSIG for the 1/4 and 1/2 NPT, and just 20 PSIG for the 1/8 NPT models.

No Drip Atomizing Nozzle
No Drip Atomizing Nozzle

Like the standard Internal Mix Atomizing  Nozzles, spray patterns include narrow and wide angle round, flat fan, deflected flat fan and a 360° hollow circular pattern offering a wide selection to best meet the application needs.

Operation at up to 180 spray cycles per minute is possible.  Air and Liquid Caps can be switched out to change the pattern and flow rates.

Typical Applications

  • Painting
  • Coating
  • Rinsing
  • Cooling
  • Quenching
  • Wetting
  • Humidification
  • Dust Control

Advantages

  • No post spray drip
  • Adjustable
  • Easily used with EFC
  • Minimizes air and liquid consumption
  • All stainless steel construction
  • Fine atomization
  • Interchangeable liquid and air caps
  • Compact

If you need an Atomizing Spray Nozzle or any of the EXAIR Intelligent Compressed Air® Products, feel free to contact EXAIR and myself or one of our Application Engineers can help you determine the best solution.

Jordan Shouse
Application Engineer
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