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23 Aug 2010

Volume 97, Issue 8, Articles (08xxxx)

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Appl. Phys. Lett. 97, 081901 (2010); http://dx.doi.org/10.1063/1.3457448 (3 pages)

Zhaofeng Li, Rongkuo Zhao, Thomas Koschny, Maria Kafesaki, Kamil Boratay Alici, Evrim Colak, Humeyra Caglayan, Ekmel Ozbay, and C. M. Soukoulis
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Optimal surface fractal dimension for heat and fluid flow in microchannels

Yongping Chen, Chengbin Zhang, Mingheng Shi, and George P. Peterson

Appl. Phys. Lett. 97, 084101 (2010); http://dx.doi.org/10.1063/1.3481379 (3 pages) | Cited 3 times

Online Publication Date: 23 August 2010

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The fractal Weierstrass–Mandelbrot function was introduced to characterize the multiscale self-affine rough surface of microchannels. Based on this fractal characterization, the role of the rough surface structure on the thermal and hydrodynamic properties in microchannels was evaluated using a computational fluid dynamic simulation. Once identified, these were used to determine the optimal surface dimension for heat and fluid flow. It was found that, no matter what the Reynolds number and roughness height are, the flow heat transfer performance is being optimized with increasing fractal dimension of the surface until to the dimension value of three (infinitely crumpled).
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47.60.Dx Flows in ducts and channels
47.85.Np Fluidics
07.10.Cm Micromechanical devices and systems
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