  KEY WORDS suspensions, inertial focusing, particle-laden flows, high Reynolds
numbers SHORT SUMMARY The inertial migration of particles in square channel
flows at the micro-scale has been deeply investigated in the last two decades.
The well-known four equilibrium positions are located near the center of each
channel face at moderate Reynolds numbers [1]. More recently, Miura et al. [2]
revealed experimentally the presence of eight equilibrium positions in
millimetric square channels for Reynolds numbers higher than 250. The aim of
the present work is to extend these results obtained at millimeter scale to the
micrometer scale. To this end, in situ visualization of particles flowing in
square micro-channels at Reynolds numbers ranging from 5 to 300 have been
conducted and analyzed.
