Heat Transfer Enhancement by Finned Heat Sinks with Micro-structured Roughness

[摘要] We investigated the benefits of micro-structured roughness on heat transfer performance of heat sinks, cooled by forced air. Heat sinks in aluminum alloy by direct metal laser sintering (DMLS) manufacturing technique were fabricated; values of the average surface roughness Ra from 1 to 25 microns (standard milling leads to roughness around 1 micron) under turbulent regimes (Reynolds number based on heating edge from 3000 to 17000) have been explored. An enhancement of 50% in thermal performances with regards to standard manufacturing was observed. This may open the way for huge boost in the technology of electronic cooling by DMLS.

[发布机构] Multi-Scale Modeling Laboratory, Energy Department, Politecnico di Torino, Corso Duca degli Abruzzi 24, Turin, Italy^1;Center for Space Human Robotics at Polito, Istituto Italiano di Tecnologia, Corso Trento 21, Turin, Italy^2

[效力级别] 无线电电子学

[关键词] Average surface roughness;Direct metal laser sintering;Forced airs;Heat Transfer enhancement;Heat transfer performance;Manufacturing techniques;Thermal Performance;Turbulent regime