39 citations · 138 across the 9 of their papers we have counts for
9 papers
Granular segregation across flow geometries: a closure model for the particle segregation velocity
Yifei Duan, Lu Jing, Paul B. Umbanhowar +2
Predicting particle segregation has remained challenging due to the lack of a general model for the segregation velocity that is applicable across a range of granular flow geometri…
General model for segregation forces in flowing granular mixtures
Yifei Duan, Lu Jing, Paul B. Umbanhowar +2
Particle segregation in dense flowing size-disperse granular mixtures is driven by gravity and shear, but predicting the associated segregation force due to both effects has remain…
Designing minimally-segregating granular mixtures for gravity-driven surface flows
Yifei Duan, Jack Peckham, Paul B. Umbanhowar +2
In dense flowing bidisperse particle mixtures varying in size or density alone, smaller particles sink (driven by percolation) and lighter particles rise (driven by buoyancy). But…
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…
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…
Modelling segregation of flowing bidisperse granular mixtures varying simultaneously in size and density
Yifei Duan, Paul B. Umbanhowar, Julio M. Ottino +1
Flowing granular materials segregate due to differences in particle size (driven by percolation) and density (driven by buoyancy). Modelling the segregation of mixtures of large/he…
Segregation models for density-bidisperse granular flows
Yifei Duan, Paul B. Umbanhowar, Julio M. Ottino +1
Individual constituent balance equations are often used to derive expressions for species-specific segregation velocities in flows of dense granular mixtures. We propose a semiempi…
Incorporation of Velocity-dependent Restitution Coefficient and Particle Surface Friction into Kinetic Theory for Modeling Granular Flow Cooling
Yifei Duan, Zhi-Gang Feng
Kinetic theory (KT) has been successfully used to model rapid granular flows in which particle interactions are frictionless and near elastic. However, it fails when particle inter…
A new kinetic theory model of granular flows that incorporates particle stiffness
Yifei Duan, Zhi-Gang Feng
Granular materials are characterized by large collections of discrete particles of sizes larger than one micron, where the particle-particle interactions are significantly more imp…