標題: Enhanced immersion cooling using two-tier micro- and nano-structures
作者: Hsu, Ya-Tzu
Li, Jia-Xiong
Lu, Ming-Chang
機械工程學系
Department of Mechanical Engineering
關鍵字: Boiling heat transfer;Immersion cooling;Novec 649;Critical heat flux;Heat transfer coefficient;Two-tier structure
公開日期: 25-二月-2018
摘要: Continual increases in the functionality and miniaturization of electronic devices have resulted in a rapid increase in the power density of such devices. Thus, an efficient cooling technology is required to maximize heat dissipation and prevent electronic failure. Immersion cooling is a promising technique for the thermal management of high-power-density electronics. However, common working fluids in immersion cooling have high global warming potential, and the heat transfer performance of immersion cooling requires improvement to achieve efficient cooling of state-of-the-art high-power-density electronics. In this study, Novec 649, which has low global warming potential and a low boiling point, was applied as a working fluid for immersion cooling. A Si nanowire (SiNW) array, Si micropillar (SiMP) array, and Si nanowires on a Si micropillar (SiNW/MP) two-tier structure were employed to enhance boiling performance. The SiMP surface exhibited the highest critical heat flux (CHF) of 23.5 +/- 1.3 W/cm(2), whereas the SiNW surface exhibited the lowest CHF but a relatively high heat transfer coefficient (HTC). The SiNW/MP surface exhibited the highest HTC of 23611.7 +/- 1586.2 W/m(2) K and a relatively large CHF of 17.4 +/- 1.2 W/cm(2). Compared with a plain SiO2 surface, the CHF and HTC of the SiNW/MP two-tier structure could be enhanced by 30% and 455%, respectively. These results suggest that the SiNW/MP surface is effective for enhancing immersion cooling. (C) 2017 Elsevier Ltd. All rights reserved.
URI: http://dx.doi.org/10.1016/j.applthermaleng.2017.12.067
http://hdl.handle.net/11536/144471
ISSN: 1359-4311
DOI: 10.1016/j.applthermaleng.2017.12.067
期刊: APPLIED THERMAL ENGINEERING
Volume: 131
起始頁: 864
結束頁: 873
顯示於類別:期刊論文