Featured Research

from universities, journals, and other organizations

Boiling water without bubbles: Researchers engineer special surface, allowing water to boil without producing bubbles

Date:
September 13, 2012
Source:
Northwestern University
Summary:
Every cook knows that boiling water bubbles, right? New research turns that notion on its head. Scientists have shown how a specially engineered coated surface can create a stable vapor cushion between the surface and a hot liquid and eliminate the bubbles that are created during boiling.

Screenshot from a movie showing the cooling of 20 mm hydrophilic (left) and superhydrophobic (right) steel spheres in 100 C water. The spheres' initial temperature is about 380 C. The bubbling phase of boiling is completely eliminated for steel spheres with superhydrophobic coating.
Credit: Image courtesy of Northwestern University

Every cook knows that boiling water bubbles, right? New research from Northwestern University turns that notion on its head.

"We manipulated what has been known for a long, long time by using the right kind of texture and chemistry to prevent bubbling during boiling," said Neelesh A. Patankar, professor of mechanical engineering at Northwestern's McCormick School of Engineering and Applied Science and co-author of the study.

This discovery could help reduce damage to surfaces, prevent bubbling explosions and may someday be used to enhance heat transfer equipment, reduce drag on ships and lead to anti-frost technologies.

Published Sept. 13 in the journal Nature, the research outlines how a specially engineered coated surface can create a stable vapor cushion between the surface and a hot liquid and eliminate the bubbles that are created during boiling.

This phenomenon is based on the Leidenfrost effect. In 1756 the German scientist Johann Leidenfrost observed that water drops skittered on a sufficiently hot skillet, bouncing across the surface of the skillet on a vapor cushion or film of steam. The vapor film collapses as the surface falls below the Leidenfrost temperature. When the water droplet hits the surface of the skillet, at 100 degrees Celsius, boiling temperature, it bubbles.

To stabilize a Leidenfrost vapor film and prevent bubbling during boiling, Patankar collaborated with Ivan U. Vakarelski of King Abdullah University of Science and Technology, Saudi Arabia. Vakarelski led the experiments and Patankar provided the theory. The collaboration also included Derek Chan, professor of mathematics and statistics from the University of Melbourne in Australia.

In their experiments, the stabilization of the Leidenfrost vapor film was achieved by making the surface of tiny steel spheres very water-repellant. The spheres were sprayed with a commercially available hydrophobic coating -- essentially self-assembled nanoparticles -- combined with other water-hating chemicals to achieve the right amount of roughness and water repellency. At the correct length scale this coating created a surface texture full of tiny peaks and valleys.

When the steel spheres were heated to 400 degrees Celsius and dropped into room temperature water, water vapors formed in the valleys of the textured surface, creating a stable Leidenfrost vapor film that did not collapse once the spheres cooled to the temperature of boiling water. In the experiments, researchers completely avoided the bubbly phase of boiling.

To contrast, the team also coated tiny steel spheres with a water-loving coating, heated the objects to 700 degrees Celsius, dropped them into room temperature water and observed that the Leidenfrost vapor collapsed with a vigorous release of bubbles.

"This is a dramatic result and there are many applications in which a vapor-loving, water-hating surface is beneficial," Patankar said.


Story Source:

The above story is based on materials provided by Northwestern University. The original article was written by Erin White. Note: Materials may be edited for content and length.


Journal Reference:

  1. Ivan U. Vakarelski, Neelesh A. Patankar, Jeremy O. Marston, Derek Y. C. Chan, Sigurdur T. Thoroddsen. Stabilization of Leidenfrost vapour layer by textured superhydrophobic surfaces. Nature, 2012; 489 (7415): 274 DOI: 10.1038/nature11418

Cite This Page:

Northwestern University. "Boiling water without bubbles: Researchers engineer special surface, allowing water to boil without producing bubbles." ScienceDaily. ScienceDaily, 13 September 2012. <www.sciencedaily.com/releases/2012/09/120913132917.htm>.
Northwestern University. (2012, September 13). Boiling water without bubbles: Researchers engineer special surface, allowing water to boil without producing bubbles. ScienceDaily. Retrieved July 22, 2014 from www.sciencedaily.com/releases/2012/09/120913132917.htm
Northwestern University. "Boiling water without bubbles: Researchers engineer special surface, allowing water to boil without producing bubbles." ScienceDaily. www.sciencedaily.com/releases/2012/09/120913132917.htm (accessed July 22, 2014).

Share This




More Matter & Energy News

Tuesday, July 22, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Government Approves East Coast Oil Exploration

Government Approves East Coast Oil Exploration

AP (July 18, 2014) The Obama administration approved the use of sonic cannons to discover deposits under the ocean floor by shooting sound waves 100 times louder than a jet engine through waters shared by endangered whales and turtles. (July 18) Video provided by AP
Powered by NewsLook.com
Sunken German U-Boat Clearly Visible For First Time

Sunken German U-Boat Clearly Visible For First Time

Newsy (July 18, 2014) The wreckage of the German submarine U-166 has become clearly visible for the first time since it was discovered in 2001. Video provided by Newsy
Powered by NewsLook.com
Obama: U.S. Must Have "smartest Airports, Best Power Grid"

Obama: U.S. Must Have "smartest Airports, Best Power Grid"

Reuters - US Online Video (July 17, 2014) President Barak Obama stopped by at a lunch counter in Delaware before making remarks about boosting the nation's infrastructure. Mana Rabiee reports. Video provided by Reuters
Powered by NewsLook.com
Crude Oil Prices Bounce Back After Falling Below $100 a Barrel

Crude Oil Prices Bounce Back After Falling Below $100 a Barrel

TheStreet (July 16, 2014) Oil Futures are bouncing back after tumbling below $100 a barrel for the first time since May yesterday. Jeff Grossman is the president of BRG Brokerage and trades at the NYMEX. Grossman tells TheStreet the Middle East is always a concern for oil traders. Oil prices were pushed down in recent weeks on Libya increasing its production. Supply disruptions in Iraq fading also contributed to prices falling. News from China's economic front showing a growth for the second quarter also calmed fears on its slowdown. Jeff Grossman talks to TheStreet's Susannah Lee on this and more on the Energy Department's Energy Information Administration (EIA) report. Video provided by TheStreet
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins