. | . |
New research introduces 'pause button' for boiling by Staff Writers Syracuse, NY (SPX) Feb 24, 2016
Gather your patience and put the old "a watched pot never boils" saying to the test. The experience might rival watching paint dry, but of course the water will eventually begin to boil. When it does, you'll see a flurry of bubbles form and quickly rise to the surface of the water. Once it kicks in, it builds at a furious pace and quickly creates a roiling cauldron on your stovetop. Time to add the pasta. People have been boiling water to make dinner for ages, but it is also used in our refrigerators and even in the international space station as a method for cooling its systems. Ninety percent of all electricity in the United States is generated with steam turbines that require boiling to make the steam. With so many uses and over five decades of research, it is hard to believe that there are any stones left unturned in our understanding of boiling. Yet, as with all things, there is always room to learn more. The formation of bubbles in boiling is not completely understood. The boiling process is largely driven by the dynamics of a very thin liquid film present at the base of each vapor bubble. Researchers have always found it challenging to study this area in the real world simply because it's so hard to get a good look at. Bubbles form in unpredictable locations during boiling, and once they do they are fleeting--leaving the heated surface immediately. Until now. Using a focused laser beam to essentially hit the pause button on boiling, Professor Shalabh Maroo's research group and collaborators at NIST and RPI have created a single vapor bubble in a pool of liquid that can remain stable on a surface for hours, instead of milliseconds. This method gives researchers the time necessary to microscopically study vapor bubbles and determine ways to optimize the boiling process--maximizing the amount of heat removal with a minimal rise in surface temperature. Maroo envisions that it will also open the door for advancements in many heat transfer systems. "With this technique, we are able to analyze the fundamentals of boiling," says Maroo. "The new understanding is going to help researchers design surface structures to achieve desired heat transfer, accurately predict as well as enhance boiling in outer space where lack of gravity causes bubbles to stay stationary on a heated surface, and create next-generation technology for thermal management in electronics." Maroo's work has been published in its entirety in Nature Publishing Group's high-impact journal, Scientific Reports. Within, Maroo elaborates on his methods and scientific achievements of this research which include the formation and analysis of a steady state bubble on hydrophilic (water-loving) and hydrophobic (water-repelling) surfaces with degassed and regular (containing dissolved air) water; in-situ imaging of the contact line region to measure the contact angle of a vapor bubble, and analysis to determine the upper limit of heat transfer coefficient possible in nucleate boiling which is obtained using experimental measurements of the microlayer (the thin liquid film).
Related Links Syracuse University Space Technology News - Applications and Research
|
|
The content herein, unless otherwise known to be public domain, are Copyright 1995-2024 - Space Media Network. All websites are published in Australia and are solely subject to Australian law and governed by Fair Use principals for news reporting and research purposes. AFP, UPI and IANS news wire stories are copyright Agence France-Presse, United Press International and Indo-Asia News Service. ESA news reports are copyright European Space Agency. All NASA sourced material is public domain. Additional copyrights may apply in whole or part to other bona fide parties. All articles labeled "by Staff Writers" include reports supplied to Space Media Network by industry news wires, PR agencies, corporate press officers and the like. Such articles are individually curated and edited by Space Media Network staff on the basis of the report's information value to our industry and professional readership. Advertising does not imply endorsement, agreement or approval of any opinions, statements or information provided by Space Media Network on any Web page published or hosted by Space Media Network. General Data Protection Regulation (GDPR) Statement Our advertisers use various cookies and the like to deliver the best ad banner available at one time. All network advertising suppliers have GDPR policies (Legitimate Interest) that conform with EU regulations for data collection. By using our websites you consent to cookie based advertising. If you do not agree with this then you must stop using the websites from May 25, 2018. Privacy Statement. Additional information can be found here at About Us. |