Navigation Links
Not your average heat shield
Date:3/26/2012

WASHINGTON, March 26In a new approach to invisibility cloaking, a team of French researchers has proposed isolating or cloaking objects from sources of heatessentially "thermal cloaking." This method, which the researchers describe in the Optical Society's (OSA) open-access journal Optics Express, taps into some of the same principles as optical cloaking and may lead to novel ways to control heat in electronics and, on an even larger scale, might someday prove useful for spacecraft and solar technologies.

Recent advances in invisibility cloaks are based on the physics of transformation optics, which involves metamaterials and bending light so that it propagates around a space rather than through it. Sebastien Guenneau, affiliated with both the University of Aix-Marseille and France's Centre National de la Recherche Scientifique (CRNS), decided to investigate, with CRNS colleagues, whether a similar approach might be possible for thermal diffusion.

"Our key goal with this research was to control the way heat diffuses in a manner similar to those that have already been achieved for waves, such as light waves or sound waves, by using the tools of transformation optics," says Guenneau.

Though this technology uses the same fundamental theories as recent advances in optical cloaking, there is a key difference. Until now, he explains, cloaking research has revolved around manipulating trajectories of waves. These include electromagnetic (light), pressure (sound), elastodynamic (seismic), and hydrodynamic (ocean) waves. The biggest difference in their study of heat, he points out, is that the physical phenomenon involved is diffusion, not wave propagation.

"Heat isn't a waveit simply diffuses from hot to cold regions," Guenneau says. "The mathematics and physics at play are much different. For instance, a wave can travel long distances with little attenuation, whereas temperature usually diffuses over smaller distances."

To create their thermal invisibility cloak, Guenneau and colleagues applied the mathematics of transformation optics to equations for thermal diffusion and discovered that their idea could work.

In their two-dimensional approach, heat flows from a hot to a cool object with the magnitude of the heat flux through any region in space represented by the distance between isotherms (concentric rings of diffusivity). They then altered the geometry of the isotherms to make them go around rather than through a circular region to the right of the heat sourceso that any object placed in this region can be shielded from the flow of heat (see image).

"We can design a cloak so that heat diffuses around an invisibility region, which is then protected from heat. Or we can force heat to concentrate in a small volume, which will then heat up very rapidly," Guenneau says.

The ability to shield an area from heat or to concentrate it are highly desirable traits for a wide range of applications. Shielding nanoelectronic and microelectronic devices from overheating, for example, is one of the biggest challenges facing the electronics and semiconductor industries, and an area in which thermal cloaking could have a huge impact. On a larger scale and far into the future, large computers and spacecraft could also benefit greatly. And in terms of concentrating heat, this is a characteristic that the solar industry should find intriguing.

Guenneau and colleagues are now working to develop prototypes of their thermal cloaks for microelectronics, which they expect to have ready within the next few months.


'/>"/>

Contact: Sarah Cogan
scogan@osa.org
202-416-1409
Optical Society of America
Source:Eurekalert  

Related biology technology :

1. Oncologists Visit Pharma Sites and Post Professional Content Online More Frequently than the Average Physician
2. VIVUS Announces Positive Results From Two Phase 3 Studies; Obese Patients on Qnexa Achieve Average Weight Loss up to 14.7% and Significant Improvements in Co-Morbidities
3. SleepQuest Compliance Again Doubles Industry Average
4. PAREXEL Consulting Quantifies Speed to Market: First-Cycle Approval for NME Produces $640 Million in Incremental Revenue on Average
5. Agendia Signs Contract with Blue Shield of California
6. Minimally Invasive Devices, Inc. Announces Release of FloShield™ PLUS
7. Shield Therapeutics Initiates AEGIS 1 and AEGIS 2 Phase 3 Studies of ST10
8. Cord Blood America Enters Agreement With Regence, Serving BlueCross and BlueShield Programs in the Northwest U.S. and Mountain Regions
9. TCT 2009 to Feature vProtect(TM) Luminal Shield, a Novel Treatment Designed for Soft Coronary Lesions from Prescient Medical
10. vProtect(TM) Luminal Shield Stabilizes Life-Threatening Plaque
11. SyntheMed Announces FDA Clearance of SinusShield(TM)
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Not your average heat shield
(Date:5/23/2016)... ... May 23, 2016 , ... ... Drive Precision Farming in 2017 and Beyond. The paper outlines the key trends ... precision ag industry. , “We’ve witnessed a lot of highs and lows as ...
(Date:5/23/2016)... 2016 Oxitec CEO Hadyn Parry ... 10:15 a.m. ET before the United States House Committee on ... can play in controlling the spread of the Aedes ...      (Logo: http://photos.prnewswire.com/prnh/20150630/227348 ) ... self-limiting gene. Trials in Brazil , ...
(Date:5/23/2016)... ... May 23, 2016 , ... ... and services based in Aurora, Ohio, has broken ground on a new building ... Research Triangle Park area, this new location solidifies a commitment to business in ...
(Date:5/22/2016)... ... May 22, 2016 , ... Doctors in Rome say micronutrients found in certain ... mesothelioma. Surviving Mesothelioma has just posted an article on the new research. Click ... of Clinical Sciences and Translational Medicine evaluated more than 150 studies on polyphenols in ...
Breaking Biology Technology:
(Date:4/28/2016)... , April 28, 2016 First quarter ... (139.9), up 966% compared with the first quarter of 2015 ... totaled SEK 589.1 M (loss: 18.8) and the operating margin was ... (loss: 0.32) Cash flow from operations was SEK 249.9 ... 2016 revenue guidance is unchanged, SEK 7,000-8,500 M. The ...
(Date:4/15/2016)... 15, 2016  A new partnership announced today ... underwriting decisions in a fraction of the time ... and high-value life insurance policies to consumers without ... With Force Diagnostics, rapid testing (A1C, Cotinine and ... (blood pressure, weight, pulse, BMI, and activity data) ...
(Date:3/31/2016)... BOCA RATON, Florida , March 31, 2016 /PRNewswire/ ... LEGX ) ("LegacyXChange" or the "Company") ... presentation for potential users of its soon to be ... The video ( https://www.youtube.com/channel/UCyTLBzmZogV1y2D6bDkBX5g ) will also ... by the use of DNA technology to an industry ...
Breaking Biology News(10 mins):