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

Hyun Yoon, Min Woo Kim, Hayong Kim, Do Yeon Kim, Seongpil An, Jong Gun Lee, Bhavana N. Joshi, Hong Seok Jo, Jeehoon Choi, Salem S. Al-Deyab, Alexander L. Yarin, Sam S. Yoon

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)198-204
Number of pages7
JournalInternational Journal of Heat and Mass Transfer
Publication statusPublished - 2016 Oct 1


  • Heat removal
  • Nanomaterials
  • Nanotextured surface
  • Water cooling

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes


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