189 citations · 935 across the 41 of their papers we have counts for
4 papers · 1 filter
Mechanisms for recirculation cells in granular flows in rotating cylindrical rough tumblers
Umberto d'Ortona, Nathalie Thomas, Richard Lueptow
Friction at the endwalls of partially-filled horizontal rotating tumblers induces curvature and axial drift of particle trajectories in the surface flowing layer. Here we describe…
Segregation forces in dense granular flows: Closing the gap from single intruders to mixtures
Yifei Duan, Lu Jing, Paul B. Umbanhowar +2
Using simulations and a virtual-spring-based approach, we measure the segregation force, Fseg, over a range of size-bidisperse mixture concentrations, particle size ratios, and she…
A unified description of gravity- and kinematics-induced segregation forces in dense granular flows
Lu Jing, Julio M. Ottino, Richard M. Lueptow +1
Particle segregation is common in natural and industrial processes involving flowing granular materials. Complex, and seemingly contradictory, segregation phenomena have been obser…
Designing non-segregating granular mixtures
Yifei Duan, Paul B. Umbanhowar, Richard M. Lueptow
In bidisperse particle mixtures varying in size or density alone, large particles rise (driven by percolation) and heavy particles sink (driven by buoyancy). When the two particle…