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3 TASK Quarterly : scientific bulletin of Academic Computer Centre in Gdansk

3 2003

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The Application of silo centrifuge testing

Grossstück M., Schwedes J.

TASK Quarterly : scientific bulletin of Academic Computer Centre in Gdansk

2003

Vol. 7, No 4

549-560

Common problems of industrial silo design can be solved with the use of the Jenike method. The Jenike method is an established procedure to investigate the critical outlet dimensions of a silo and the flow profile. However, in some cases the Jenike method is assumed to lead to overdesign, especially when silo design is calculated for highly dispersed bulk solids in the nano range or if the bulk solid contains moisture. Another way to determine the critical outlet dimension of a silo is a model test. We then have to consider the boundary conditions, i.e. the particle size, and a possible size reduction of the model silo, which is only possible in a centrifugal field using cohesive bulk solids. In this work, results of experiments in a silo centrifuge regarding scale-up are presented. The experiments have been performed to investigate the critical outlet dimension for a silo for very fine and moist bulk solids.

Investigation of powder properties using alternating strain paths

Morgeneyer M., Schwedes J.

TASK Quarterly : scientific bulletin of Academic Computer Centre in Gdansk

2003

Vol. 7, No 4

571-578

Steady-state flow (ssf) of powders has been investigated using alternating strain paths, with precompacted powder samples sheared in alternating directions. The dependency of ssf on the level of precompaction is shown.

Dynamic measurement and simulation of bulk solids during silo discharge

Ostendorf M., Schwedes J., Antes H., Böhrnsen J. U.

TASK Quarterly : scientific bulletin of Academic Computer Centre in Gdansk

2003

Vol. 7, No 4

611-621

This paper deals with the experimental investigation and numerical simulation of silo discharge processes, including dynamic interactions between silo filling and elastic silo walls. The experiments have taken place in a large model silo with a height of 3m and a rectangular base of 800 to 400mm. Optical measurement techniques have been applied to investigate the flow profile, while load cells on the silo walls have registered the stress' evolution, e.g. a stress peak (switch) move from the outlet to the transition of hopper and shaft. The measured data have been compared with simulation results of the Institute of Applied Mechanics at the Technical University of Braunschweig. It has been possible because the numerical simulation examples have been chosen to be similar to the experimental test silo. The discharge process in the simulation is described by a system of nonlinear differential equations. Via the Finite Element Method (FEM) based on an Eulerian reference frame deformation rate, velocity field, porosity and stress distribution can be calculated without the need for re-meshing the FE grid.