Project Details
Abstract
Particle motion in rotating drum can be very different at different operating conditions
and hence several granular flow regimes have been reported. When the granular mixtures of
different physical properties are tumbled in a rotating drum, particles of different physical
properties show different trajectories and may perform segregation, causing spatial
non-uniformity. Therefore, the investigation of particle motion is always regarded as one of
the most important subjects in chemical engineering and pharmaceutical processing. In this
three-year project, we will develop a reliable continuum Eulerian model for granular flow in
rotating drums. The model will be experimentally validated and will apply to rotating drum
scale up design.
In our preliminary study, the widely used Gidaspow kinetic viscosity model failed to
predict the dynamic angle of repose of the particles in a rotating drum operating in the rolling
mode. This project will provide a new kinetic viscosity model for kinetic theory of granular
flow. In the project first year, the kinetic theory of granular flow coupled continuum Eulerian
model will be used to simulate single component granular flow in the rotating drum. The best
kinetic viscosity values of the granular flows at different operating conditions are fitted by a
trial-and-error algorithm. A kinetic viscosity model will then be developed based on the
particle diameter and the drum wall shearing. In the second year, the modified continuum
Eulerian model will be used to simulate binary mixture segregation in the rotating drum. The
simulated results will be validated by the rotating drum segregation experiments using binary
mixtures with different interstitial fluids. In the last year, the developed model will be used to
simulate the drum systems of different sizes. A drum design scale-up rule will be developed
from the different size drum simulations.
Project IDs
Project ID:PB10007-7237
External Project ID:NSC100-2221-E182-048
External Project ID:NSC100-2221-E182-048
Status | Finished |
---|---|
Effective start/end date | 01/08/11 → 31/07/12 |
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