Nanotechnology Conference and Trade Show - Nanotech 2006
> Program > Technical Conferences > Business & Development > Nano Impact Workshop > Nanotech Job Fair > Expo
Program
Sessions
Sunday
Monday
Tuesday
Wednesday
Thursday
Index of Authors
Index of Keywords
Confirmed Speakers
Conferences & Symposia

Conference Proceedings

Conference Technical Proceedings

Chaotic flows in microchannels: A lattice Boltzmann study

F. Varnik and D. Raabe
Max-Planck Institut fuer Eisenforschung, DE

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.

Back to Program

Sessions Sunday Monday Tuesday Wednesday Thursday Authors

Nanotech 2006 Conference Program Abstract

 
Nanotechnology Conference | Terms of use | Privacy policy | Contact | NSTI Home
Program | Technical Conferences | Business & Development | Nano Impact Workshop | Nanotech Job Fair | Expo |
Nanotech 2006 Home | Press Room | Venue | Subscribe | Site Map
Names, and logos of other organizations are the property of those organizations and not of NSTI.
This event is not open to the general public and NSTI reserves the right to refuse admission and participation to any individual.