Chaotic flows in microchannels: A lattice Boltzmann study

	Nanotech 2006 Vol. 2 Technical Proceedings of the 2006 NSTI Nanotechnology Conference and Trade Show, Volume 2 Chapter 8: Micro & Nano Fluidics
	Chaotic flows in microchannels: A lattice Boltzmann study
Authors:	F. Varnik and D. Raabe
Affilation:	Max-Planck Institut fuer Eisenforschung, DE
Pages:	647 - 650
Keywords:	lattice Boltzmann method, chaotic mixing, flow at rough
Abstract:	Lubricant flows are usually assumed to be laminar and the lubricated metallic surfaces are anticipated to be perfectly flat and references therein). Both assumptions are incorrect when it comes to a detailed analysis. Indeed, metallic surfaces are never flat but reveal an average roughness ranging from some nanometers to some micrometers depending on the mechanical and microstructural boundary conditions. This applies in particular to the evolution of surface roughness during elastic-plastic deformation. This aspect has a strong influence on fluid dynamics at such interfaces. In particular, near-surface fluid flow in the vicinity of a metallic surface may become chaotic and unstable as the surface roughness comes into play. This roughness-induced chaotic flow is not necessarily identical to fully developed turbulence. Nevertheless it exhibits strong temporal and spatial fluctuations of the velocity field. These findings are not only relevant for metal forming, but also for all flow situations where the dimensions of “roughness elements” (obstacles) are about 10% of the channel width or larger. In view of increasing number of potential applications of chaotic flows in civil engineering, environmental industry (e.g. solution recovery) as well as in the medical science (e.g. enhanced chaotic mixing in microchannels), the results of our studies may find a wide range of applications as they open an alternative way for tuning flow properties, namely via a clever design of microchannels.
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ISBN:	0-9767985-7-3
Pages:	893
Hardcopy:	$119.95

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