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

Microtechnology and Thermal Problems in Electronics

物理学;无线电电子学

Ventola, L.^1 ; Chiavazzo, E.^1 ; Calignano, F.^2 ; Manfredi, D.^2 ; Asinari, P.^1

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

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

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/494/1/012009/pdf
DOI  :  10.1088/1742-6596/494/1/012009

来源: IOP

【 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.