PaintSquare.com
      | Connect Follow us on Twitter Like us on Facebook
About | Subscribe | Advertise
  

 

Download our free BWater Works Coating Systems eResource Book

Paint and Coatings Industry News

Main News Page


Coating Could Tame Explosive Boiling

Tuesday, September 25, 2012

More items for Coating Materials

Comment | More

A new superhydrophobic coating may help suppress explosive boiling reactions like those that can occur in nuclear reactors and other equipment exposed to water at high heat.

 Ivan Vakarelski/KAUST

 Ivan Vakarelski/KAUST

As a hot 20mm steel ball cools in water, a vapor film that envelops the ball collapses, causing a transition from a gentle type of boiling (left) to an explosive one.

The research, by an international team of scientists, focuses on controlling the reaction that causes water droplets to skitter across a hot frying pan.

Known as the Leidenfrost effect, the reaction “can be big trouble for equipment exposed to water at high temperatures, such as nuclear reactors, because sometimes the transition away from it leads to explosive boiling,” the researchers explain in a video demonstration of their research.

The team is led by Ivan U. Vakarelski, of Saudi Arabia’s King Abdullah University of Science & Technology, and Neelesh A. Patankar, of Northwestern University. Their work is published in Nature, DOI: 10.1038/nature11418.

Steel and Side Mirrors

The team started with steel spheres, then applied a patented coating that is normally used to keep rain from accumulating on car side mirrors. The textured coating renders the spheres super-water-repellent (superhydrophobic) and leads to smooth, nearly bubble-less boiling.

Leidenfrost effect

The researchers used high-speed photography to monitor the processes of the steel balls treated with a variety of coatings.

In one case, they found that immersing 20mm hydrophilic balls heated to more than 400°C in water caused the water to boil at the steel surface gently in a nearly bubble-free manner known as film boiling. As the surface temperature cooled to 275°C, the protective vapor layer collapsed, leading to an explosive transition to the “nucleate boiling” regime.

The textured superhydrophobic coating completely suppressed the violent transition, they report.
 
Watch the video.

   

Tagged categories: Coatings technology; Nuclear Power Plants; Protective coatings; Research; Temperature

Comment Join the Conversation:

Sign in to our community to add your comments.

Sherwin-Williams
Sherwin-Williams Protective & Marine Coatings

With 4,000 distribution points and 3,700+ years of experience, Sherwin-Williams delivers the products, support and expertise you need, right where you need it.


Polyval Coatings
Polyflex® Polyurea Linings

Polyflex™ new Polyurea Geotextile Membrane System has been specifically engineered to protect the environment in containment applications.
www.polyflexlinings.com


Carboline Company
Fireproofing Solutions

Pyroclad® X1 Thermo-Lag® Pyrocrete® – protecting against hydrocarbon and jet fires, explosions, and cryogenic spills.


BASF
New resins from BASF will have metals loving water:

Excellent corrosion resistance, low VOC, high gloss, thin films basf.us/industrialcoatings
polyorders@basf.com
800-231-7868


SSPC: The Society for Protective Coatings
http://www.sspc.org/

Join SSPC and Enhance
Your Career !


Binks/DeVilbiss
Built for Tough Jobs

From Epoxies to Urethanes to other high solid coatings, the new Binks Airless 75 delivers a great finish using an ergonomic design. Visit binks.com for more information.


Wasser High-Tech Coatings Inc.
Wasser Coatings Protect

Wasser Coatings offer a complete range of Moisture Cure Urethane (NEPCOAT approved) systems in addition to Polyurea membranes and linings(NSF).
www.wassercoatings.com


Jessup Manufacturing Company
More Traction for Extreme Marine Conditions

Jessup Safety Track® 3800 Military Grade peel-and-stick non-skid tapes and treads provide extra slip resistance for decks. MIL-PRF-24467C Type XI, Black & Gray.


Thermion Inc
Buy Back Program

We are offering $5,000
credit for your old Model
This drive system is
being discontinued by
the manufacturer.
More information at
thermioninc.com
877.884.3428


International Paint LLC
Premium Low VOC Polyurethane Finish

AkzoNobel introduces Interthane 990V as a 250 g/l HAPS free polyurethane with outstanding color and gloss retention. 990V is fast curing and applicator friendly.

 
 
 
Technology Publishing

The Technology Publishing Network

The Journal of Protective Coatings & Linings (JPCL) PaintSquare
Durability + Design Paint BidTracker

 
EXPLORE:      JPCL   |   PaintSquare News   |   Interact   |   Buying Guides   |   Webinars   |   Resources   |   Classifieds
REGISTER AND SUBSCRIBE:      Free PaintSquare Registration   |   Subscribe to JPCL   |   Subscribe to PaintSquare News
MORE:      About PaintSquare.com   |   Privacy policy   |   Terms & conditions   |   Site Map   |   Search   |   Contact Us
 

© Copyright 2000-2015, Technology Publishing / PaintSquare, All rights reserved
2100 Wharton Street, Suite 310, Pittsburgh PA 15203-1951; Tel 1-412-431-8300; Fax 1-412-431-5428; E-mail webmaster@paintsquare.com