Study of Particle Motion in Closed-Streamline Flows
Hamed Haddadi (City College of New York), Shahab Shojaei-Zadeh (Rutgers University), Kevin Connington (The Levich Institute), Jeffrey Morris (Levich Institute and Dept. of Chemical Engineering, CCNY)
Complex Fluids: Suspensions, Emulsions, and Gels
Tue 9:00 - 10:30
Barus-Holley 160
Inertial flow of suspensions arises in applications from coating to flow of blood which has biological relevance. In order to explore phenomena associated with interaction of particles with inertial flow, we employed microfluidic experiments and lattice-Boltzmann simulations to investigate the flow of neutrally-buoyant suspensions of particles around bluff bodies. We studied the interaction of particles with wakes formed behind objects with circular and square cross-sections, as well as a narrow rectangular shaped object called a "blade." High-speed video imaging indicated a segregation of the fluid and particles in the wake region. Trajectories of particles interacting with the obstacle and wake were extracted by simulation. We demonstrate that particles enter and leave the closed-streamline zone at the leading and trailing edges, respectively. By simulation, the trajectories of particles placed inside the wake at various points are detailed.