Chiavazzo and Asinari Nanoscale Research Letters 2011, 6:249

Chiavazzo and Asinari Nanoscale Research Letters 2011, 6:249 NANO EXPRESS Open Access Enhancing surface heat transfer by carbon nanofins: towards an alternative to nanofluids? Eliodoro Chiavazzo and Pietro Asinari* Abstract Background: Nanofluids are suspensions of nanoparticles and fibers which have recently attracted much attention because of their superior thermal properties. Nevertheless, it was proven that, due to modest dispersion of nanoparticles, such high expectations often remain unmet. In this article, by introducing the notion of nanofin, a possible solution is envisioned, where nanostructures with high aspect-ratio are sparsely attached to a solid surface (to avoid a significant disturbance on the fluid dynamic structures), and act. | Chiavazzo and Asinari Nanoscale Research Letters 2011 6 249 http content 6 1 249 o Nanoscale Research Letters a SpringerOpen Journal NANO EXPRESS Open Access Enhancing surface heat transfer by carbon nanofins towards an alternative to nanofluids Eliodoro Chiavazzo and Pietro Asinari Abstract Background Nanofluids are suspensions of nanoparticles and fibers which have recently attracted much attention because of their superior thermal properties. Nevertheless it was proven that due to modest dispersion of nanoparticles such high expectations often remain unmet. In this article by introducing the notion of nanofin a possible solution is envisioned where nanostructures with high aspect-ratio are sparsely attached to a solid surface to avoid a significant disturbance on the fluid dynamic structures and act as efficient thermal bridges within the boundary layer. As a result particles are only needed in a small region of the fluid while dispersion can be controlled in advance through design and manufacturing processes. Results Toward the end of implementing the above idea we focus on single carbon nanotubes to enhance heat transfer between a surface and a fluid in contact with it. First we investigate the thermal conductivity of the latter nanostructures by means of classical non-equilibrium molecular dynamics simulations. Next thermal conductance at the interface between a single wall carbon nanotube nanofin and water molecules is assessed by means of both steady-state and transient numerical experiments. Conclusions Numerical evidences suggest a pretty favorable thermal boundary conductance order of 107 W-m-2-K-1 which makes carbon nanotubes potential candidates for constructing nanofinned surfaces. Background and motivations Nanofluids are suspensions of solid particles and or fibers which have recently become a subject of growing scientific interest because of reports of greatly enhanced thermal properties 1 2 . Filler dispersed in a .

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