DigiPac can operate in two modes: a Monte Carlo mode in which particles undergo directional diffusive motions; and a Discrete Element mode where translations and rotations of particles are governed by physical laws. The former is faster but in certain cases less accurate, whereas the latter is slower but produces significantly more accurate predictions.
Both modes have been used in simulating packed columns of real pellet shapes. Results for spheres and cylinders - the most commonly used for packed columns – are reported. Comparisons are made between DigiPac predictions under different modes and experimental data obtained using nuclear magnetic resonance (NMR) imaging technique, in terms of mean packing density, voids distribution, and pellets orientation distribution. Good agreements have been observed.
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