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Increasing heat transfer of metals through periodical microstructures using Direct Laser Interference Patterning

 
: Alamri, Sabri; Schell, Frederic; Steege, Tobias; Lasagni, Andrés-Fabián; Kunze, Tim

Wissenschaftliche Gesellschaft Lasertechnik -WLT-:
Lasers in Manufacturing, LiM 2019 : Munich, Germany, June 24-27, 2019; Proceedings; World of Photonics Congress
Munich, 2019
Art. 295, 8 pp.
Lasers in Manufacturing Conference (LiM) <2019, Munich>
World of Photonics Congress <2019, Munich>
European Commission EC
H2020; 675063; Laser4FUN
EUROPEAN ESRs NETWORK ON SHORT PULSED LASER MICRO/NANOSTRUCTURING OF SURFACES
English
Conference Paper
Fraunhofer IWS ()
heat transfer; microstructure; DLIP

Abstract
The increasing number of micro-electronic components per unit area led not only to an increase of computing power but also to an increase of the device’s operating temperature. Heat sinks, equipped with macroscopic fins or pins, dissipate heat by increasing the surface area. In this work, a microscopic approach for improving the heat transfer of metals is presented, aiming to increase the surface area by fabricating periodical microstructures. Direct Laser Interference Patterning has been used for fabricating microstructures on stainless-steel plates employing a nanosecond IR laser. A statistical design of experiment was used for optimizing the structuring parameters and maximizing the surface area. The heat dissipation properties, evaluated with a heat flux sensor, were correlated with the developed surface area, finding a clear trend. In particular, the microstructuring permitted to increase the surface area up to 280%, which lead to an increase of heat transfer by 23.8%.

: http://publica.fraunhofer.de/documents/N-552274.html