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Accueil > Séminaires > Archives > Archives 2010

Traffic jams and intermittent flows in microfluidic networks

Nicolas Champagne, PMMH, ESPCI

par Salmon Jean-Baptiste - publié le

We investigate both experimentally and theoretically the traffic of particles flowing in
microfluidic obstacle networks. We show that the traffic dynamics is a non-linear process : the
particle current does not scale with the particle density even in the dilute limit where no
particle collision occurs. We demonstrate that this non-linear behavior stems from long range
hydrodynamic interactions. Importantly, we also establish that there exists a maximal current
above which no stationary particle flow can be sustained. For higher current values,
intermittent traffic jams forms thereby inducing the ejection of the particles from the initial
path and the subsequent invasion of the network. Eventually, we put our findings in the
broader context of the transport processes of driven particles in low dimension.