Phone Con Minutes 08/09/2010 16:00-17:15 WP1 – Kickoff Participants:

1. PhoneCon Minutes 08/09/2010 16:00-17:15 WP1 – Kickoff Participants: BASF: Herman Feise (left earlier), Thomas Letzelter TU BS: Harald Zetzener, Arno Kwade (later) UE: Jin Ooi, Subhash Thakur UTC: Piotr Frankowski, Martin Morgeneyer, Maria Paulick Zeppelin: Harald Wilms

2. Agenda of the phonecon • Introduction, MM, 16:00-16:05 • Discussion of scientific approach, 16:05-16:15 • Discussion of experiments and simulations, 16:15-16:30 • Discussion of reference test materials, 16:30-16:40 • Discussion of milestones, 16:40-16:50 • Questions and conclusions, 16:50-17:15 * Indications in black reflect participants comments to the handout

3. Overview

4. Comments Overview • Perspectives I and II are at particle level, III and IV are at bulk level. It is suggested to also consider meso parameters (V) meso parameters already including cohesive forces • Some projects will only consider meso parameters • Meso group is to go beyond particle parameters without looking into bulk  saving time using just a few particles • Micro parameters are difficult to measure  Meso is a possible point to start  WP1 will also take into consider perspective V

5. Particle Level • Effective parameters: • Repulsive force • Cohesion force • Friction force • Coefficient of restitution • Stiffness • Underlying properties: • Normal force • Shear force • Rolling / sliding friction • Coefficient of restitution • Particle size • Particle shape • Particle density • Stiffness • Particle roughness • Particle surface structure • … Focusing on effects

6. Comments particle level • Normal force includes cohesive and repulsive forces and is somehow a force displacement behavior • the coefficient of restitution is important only in some applications such as conveying (but not when particle are already in contact, e.g. storage) • Particle surface structure, including its roughness, is important for cohesive material • Structure and roughness to estimate distances between particles and scattering of cohesive forces • Torsion and rolling friction might be negligible

7. Bulk Level Effective bulk parameters: • Compressive strength, tensile strength • Scale information: porosity depending on normal stress (compaction) • Flow function • Anisotropy of flow function • Permeability • Size distribution • (Angle of repose) The participants agreed to always check the results (real world vs. virtual world) !

8. Measurement Methods I

9. Measurement Methods II

10. Comments Measurement • UE: 3-4 AFM, available equipment to measure coefficient of restitution for small single particle using also a 45degree mirror • TU BS: set up for measurement of coefficient of restitution for spherical particles • List of equipment is established for UTC and TU BS, needs to be filled out for the other institutions  Please send your list to pardem@utc.fr • After having an overall list, decisions about what methods to use can be taken

11. Materials

12. Comments Material • Glass beads are ideal for the investigation of particle size influence • Aluminium oxide could be used for the investigation of shape influence • BASF and Zeppelin will send samples of the proposed material to make some basic tests in order to get a feeling for the material

13. Comments on Milestones • Deliverables date to Brussels are going to be discussed and changed, e.g. state of the art of calibration in about 3-6 months from now. • Harald Wilms and Martin Morgeneyer, who lectured last week at the Vienna Summer School, would like to get a feedback to their lecture and would be available to give further presentations, e.g. on industrial view of powder problems