A5077315748- Granular flow and fluidized beds
- Fluid Dynamics and Mixing
- Particle Dynamics in Fluid Flows
- Fluid Dynamics and Heat Transfer
- Tribology and Lubrication Engineering
- Industrial Technology and Control Systems
- Cyclone Separators and Fluid Dynamics
- Heat Transfer and Boiling Studies
- Hydraulic and Pneumatic Systems
- Mineral Processing and Grinding
- Lattice Boltzmann Simulation Studies
- Minerals Flotation and Separation Techniques
Columbia University
2019-2021
Significance The motion of granular materials, e.g., sand or catalytic particles, underlies many natural and industrial processes. Granular dynamics are difficult to understand model because transitions between solid-, liquid-, gas-like behavior, prior continuum models have struggled capture these transitions. Bubble-like voids normally rise chaotically through grains suspended by upward gas flow. We create structured bubble formations vibrating the system at a resonant frequency,...
The collapse, or reduction in size to zero volume, of bubbles injected into incipiently fluidized beds was studied using rapid magnetic resonance imaging. collapse a smaller lower bubble trailing larger upper and the one when two rose side by were found occur. Under same conditions with use finer particles injection an isolated bubble, no occurred. Thus, results indicate that gas leakage particulate phase coarse interaction promote collapse. Furthermore, also resulted rising bed surface...
A study sheds light on the behavior of two interacting gas jets in a fluidized bed. Two regimes are identified: bubbles break off from either synchronous pattern or an alternating asynchronous pattern. Which forms depends separation distance between and particle size By reproducing magnetic resonance imaging results using simulations, is attributed to dominance drag forces over dissipative particles jets.
Computational fluid dynamics--discrete element method simulation results demonstrate the bubble collapse phenomenon observed in a prior experimental study when two bubbles are injected side-by-side into an incipiently fluidized bed. Results confirm that one of collapses there is slight size difference between and its extent beyond critical value. The occurs because preferential gas channeling toward larger bubble, which leaves smaller without sufficient flow to support shape.