Micro-structured rough surfaces by laser etching for heat transfer enhancement on flush mounted heat sinks

[摘要] The aim of this work is to improve heat transfer performances of flush mounted heat sinks used in electronic cooling. To do this we patterned 1.23 cm2heat sinks surfaces by microstructured roughnesses built by laser etching manufacturing technique, and experimentally measured the convective heat transfer enhancements due to different patterns. Each roughness differs from the others with regards to the number and the size of the micro-fins (e.g. the micro- fin length ranges from 200 to 1100 μm). Experimental tests were carried out in forced air cooling regime. In particular fully turbulent flows (heating edge based Reynolds number ranging from 3000 to 17000) were explored. Convective heat transfer coefficient of the best micro-structured heat sink is found to be roughly two times compared to the smooth heat sinks one. In addition, surface area roughly doubles with regard to smooth heat sinks, due to the presence of micro-fins. Consequently, patterned heat sinks thermal transmittance [W/K] is found to be roughly four times the smooth heat sinks one. We hope this work may open the way for huge boost in the technology of electronic cooling by innovative manufacturing techniques.

[发布机构] Multi-Scale ModeLing Laboratory (SMaLL), Energy Department, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129, Turin, Italy^1;Microla Optoelectronics S.r.l., Localita Baraggino, 10034 Chivasso, Turin, Italy^2

[效力级别] 无线电电子学

[关键词] Convective heat transfer;Convective heat transfer Coefficient;Forced air cooling;Heat Transfer enhancement;Heat transfer performance;Innovative manufacturing;Manufacturing techniques;Thermal transmittance