Studying The Segré- Silberberg Effect By
Velocimetry In Microfluidic Channels
Author(s)
C. Sommer, S. Quint, P. Spang, T. Walther & M. Baßler
Abstract
The specific equilibrium distance from the channel axis for particles in a laminar
flow (Poiseuille Flow) according to the Segré-Silberberg effect has been
extensively studied in microfluidic systems and it has been shown that particles
of different sizes accumulate at different specific equilibrium distances. Little is
known about the corresponding velocities and dynamics of the particle
migration.
Here, we measure the velocity distributions of particles migrating to their
equilibrium positions in micro channels with rectangular cross section
(12 μ ∗ 477 μ) at a fixed migration distance (47.5 ) for varying particle
diameter (1‐7 μ) and a wide range of Reynolds numbers (0.6–16). The
measurements show the transition between two clearly distinct regimes. At low
Reynolds numbers, the particle velocities suggest particle trajectories nearly
uniformly distributed over the channel height. At high Reynolds numbers, the
particles switch to a velocity about one third slower than the maximal velocity of
the parabolic flow profile. In this regime, the particles propagate on
Segré-Silberberg equilibrium positions between the channel axis and a channel
wall. The transition to the Segré-Silberberg regime requires higher Reynolds
numbers for smaller particles. We will further discuss the relationship between
the various hydrodynamic forces (inertial force and wall force) and the velocity
for both regimes in the framework of recent theories.
Keywords: inertial migration, Segré-Silberberg effect, tubular pinch effect,
micro-particles, velocity distribution, micro-particle velocity.
Keywords
inertial migration, Segré-Silberberg effect, tubular pinch effect,micro-particles, velocity distribution, micro-particle velocity.
Related Book
Other papers in this volume
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