A5021122728- Granular flow and fluidized beds
- Particle Dynamics in Fluid Flows
- Mineral Processing and Grinding
- Fluid Dynamics and Heat Transfer
- Cyclone Separators and Fluid Dynamics
- Hydrology and Sediment Transport Processes
- Adhesion, Friction, and Surface Interactions
- Soil Mechanics and Vehicle Dynamics
- Material Dynamics and Properties
- Material Properties and Processing
- Landslides and related hazards
- Geotechnical and Geomechanical Engineering
Columbia University
2025
University of Canterbury
2022-2024
Spouted bed instabilities, such as spout deflection and oscillation, are well understood to decrease the particle recirculation rate, which decreases drying mixing efficiency. A recent study (Punch et al., Chem. Eng. J., 2024 495, 153459) showed that vertical vibration could be used instabilities in dry wet spouted beds at low height for large particles, without compromising rate. Here, we show experimentally can also reduce of particles with a inlet diameter ratio (>20), traditionally...
The descent of dense intruder disks through granular material fluidized by vertical gas flow and vibration is investigated experimentally computationally. Single intruders descend with a velocity which oscillates based on distance above the bottom system, simulations show due to spatially dependent void fraction in changing effective drag force intruder. Two vertically aligned undergo drafting-kissing-tumbling analog forms because decelerates particle compaction from weight top locked icon...
Abstract Oblique collisions of two spherical particles coated with a thin layer viscous liquid are considered. Experimental measurements performed using particle tracking velocimetry and the results compared to force capillary models via numerical simulation discrete‐element method. Comprehensive experimental data for an impact angle between 0° 60° presented ensure future can be rigorously validated. Collisions characterized by normal Stokes' number (a dimensionless ratio inertial forces...
Numerical simulations of wet particles often use the particle roughness as a minimum separation criterion to limit viscous force. Here we investigate validity this through comparison experiments binary collisions numerical discrete element method (DEM) and smoothed hydrodynamics (SPH) simulations.
Abstract Measurement of the contact time for two spheres coated in a thin viscous film are considered. Measurements performed using Newton's cradle apparatus with current passed through such that voltage can be used to infer separation between spheres. The either nonconductive liquid (silicone oil) or conductive (glycerol and KCl). sphere‐film sphere‐sphere different thicknesses precollisional velocities presented. these times compared numerical simulations discrete element method (DEM)....
Oblique collisions of two spherical particles coated with a thin layer viscous liquid are considered. Experimental measurements performed using particle tracking velocimetry. Comprehensive experimental data for an impact angle between 0° - 60° presented. Collisions characterised by the Stokes’ number, coefficient restitution, and rotational velocity. The experiments compared to numerical simulations discrete element method (DEM). translational velocities predicted were in good agreement at...