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Particle segregation in vibrofluidized beds due to buoyant forces
1School of Mechanical Engineering, Purdue University, West Lafayette, Indiana 47907-1288, USA.
Physical Review Letters
|August 11, 2001
Summary
The equilibrium height of an impurity in a vibrofluidized bed rises with increased vibration velocity but falls as the impurity becomes denser than surrounding particles. A simple model accurately predicts this impurity position.
Area of Science:
- Physics
- Particle Technology
- Granular Materials
Background:
- Vibrofluidization is a technique used to fluidize granular materials through vibration.
- Understanding particle segregation and impurity behavior is crucial for process design in granular systems.
Purpose of the Study:
- To investigate the equilibrium position of an impurity within a vibrofluidized bed.
- To determine the influence of vibration parameters and particle properties on impurity height.
Main Methods:
- Two-dimensional discrete element computer simulations were employed.
- Simulations analyzed the steady-state behavior of an impurity in a homogeneous particle bed subjected to vibration.
Main Results:
- Impurity equilibrium height increases with increasing vibration velocity amplitude.
- Impurity equilibrium height decreases as the density ratio of impurity to surrounding particles increases.
- A simple model balancing impurity weight against particle impact buoyancy effectively predicts the impurity position.
Conclusions:
- Vibration velocity and relative density are key factors controlling impurity position in vibrofluidized beds.
- The developed model provides a reliable method for predicting impurity behavior, aiding in granular system design and control.