Session RV: Suspensions III
3:05 PM–4:23 PM, Tuesday, November 23, 2010
Hyatt Regency Long Beach Room: Regency B
Chair: Martin Maxey, Brown University
Abstract ID: BAPS.2010.DFD.RV.3
Abstract: RV.00003 : Probing particle transport in closed-streamline flows with microfluidic devices
3:31 PM–3:44 PM
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Abstract 
Authors:
Shahab Shojaei-Zadeh
(Rutgers University)
Jeffrey Morris
(The City College of New York)
We use microfluidic devices to study the flow of neutrally-buoyant suspension around bluff-bodies. We use low-viscosity liquids and monodisperse particles of diameter below 10 $\mu $m at a constant concentration of 8.4 volume {\%}. Several bluff-body geometries are introduced and by using high-speed video imaging we observe a striking segregation of the particles and fluid in the wake region at elevated Reynolds numbers. Based on 2-D and 3-D flow field simulations, we interpret the migration of particles and their trajectories across the streamlines based on the geometry of the bluff-body. Experimental observations reveal that if particles are forced into an initially particle-depleted region, they will eventually leave and will bring the system to its original state.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2010.DFD.RV.3