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Efficient heat removal via thorny devil nanofiber, silver nanowire, and graphene nanotextured surfaces.

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journal contribution
posted on 16.10.2017, 00:00 by Yoon H, Kim M-W, Kim H, Kim D-Y, Seongpil A, Lee J-G, Joshi BN, Jo HS, Choi J, Salem S. Al-Deyab, Yarin AL, Yoon SS
Several types of nano-textured surfaces were studied with the goal to enhance heat removal rate in a cooling device (a heat sink) with water flow-through. The nano-textured surfaces where heat removal to flowing water took place included: (i) electrospun copper-plated thorny-devil nanofibers deposited on the copper substrate, (ii) graphene oxide flakes sprayed on the copper substrate, and (iii) silver nanowires spin-coated on a separate copper substrate. Their cooling performance was monitored by measuring the difference between the outlet and inlet temperature of water flowing through the heat sink and the temperature of the nano-textured copper substrate in the heat sink. The effect of the macroscopic vortex generator (wires) on cooling of the heat sink surface was less than that of the nano-textured surfaces, which revealed that the latter provide a much larger interfacial area, rather than an extra flow mixing, to enhance heat transfer rate. Of the nano-textured surfaces the most significant cooling enhancement was achieved with silver nanowires.


This work was supported by the Industrial Strategic Technology Development Program (10045221) funded by the Ministry of Knowledge Economy (MKE, Korea) and NRF-2013M3A6B1078879. This research was partially supported by the Commercializations Promotion Agency for R&D Outcomes (COMPA) funded by the Ministry of Science, ICT and Future Planning (MISP).


Publisher Statement

This is the author’s version of a work that was accepted for publication in International Journal of Heat and Mass Transfer. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in International Journal of Heat and Mass Transfer. 2016. 101: 198-204. doi: 10.1016/j.ijheatmasstransfer.2016.05.030.





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