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@article{faucris.111647404,
abstract = {Characterization of two-dimensional flows in microchannels with
anisotropic periodic grooves is numerically carried out by using the
lattice Boltzmann method. Periodically placed microstructures,
consisting of novel nozzle-diffuser-like grooves are deliberately
designed to introduce a flow-direction dependent resistance. Simulations
were conducted for a low-to-moderate Reynolds number in the
laminar-transition flow regime. Different channel geometries, defined by
the half-angle
of the periodic grooves are considered. The influence of the half-angle
on both the flow field and the onset of oscillatory flow regime at
different driving body forces is analyzed. At a low Reynolds number, the
flow is observed stationary and fully reversible, regardless of the
groove geometry. In this regime, higher Reynolds numbers were observed
when the geometry acts as a diffuser (negative flow) than as a nozzle
(positive flow) for a given driving body force. At sufficiently high
Reynolds number the flow turns from a steady state to a time-dependent
oscillatory regime through a Hopf bifurcation. Successive flow
bifurcations lead the flow structure from a periodic regime to a
quasi-chaotic regime with three-dimensional structures. The onset of
unsteady flow occurs earlier for positive flows and geometries with
small half-angles. For higher driving forces, there is a reduction in
the volume flow rate due to the advected material in the transversal
direction, causing consequently a decrease in the Reynolds numbe},
author = {Osorio Nesme, Anuhar and Delgado, Antonio},
doi = {10.1088/1873-7005/aa7a35},
faupublication = {yes},
journal = {Fluid Dynamics Research},
keywords = {fluid mechanics; grooved channel; lattice Boltzmann method; unsteady flow},
note = {UnivIS-Import:2018-02-22:Pub.2017.tech.ITC.stmmec.flowch},
pages = {055502},
peerreviewed = {Yes},
title = {{Flow} characterization in periodic microchannels containing asymmetric grooves},
volume = {49},
year = {2017}
}