Advanced Powder Flow Course  - 24-25 May, 2022 from 3pm to 6pm (CET)

Program

Day 1: Fundamentals and measurements methods

15h00 – 15h15: Welcome​

15h15 – 16h00: Interactions between grains: an overview

16h00 – 16h10: Pause​

16h10 – 16h55: Focus on electrostatics

16h55 – 17h05: Pause​

17h05 – 17h30: How to measure powder electrostatic properties?

17h30 – 18h00: Q&A and Conclusions​

Day 2: Case studies

15h00 – 15h15: Welcome​

15h15 – 16h00: Effect of environmental conditions on powder electrostatics

16h00 – 16h20: Effect of grain characteristics on powder electrostatics

16h20 – 16h30: Pause​

16h30 – 17h30: Tribo-charging in powder processing applications

17h30 – 18h00: Q&A and Conclusions  

Advanced Powder Flow Course: focus on electrostatics

It is well known that electrostatic charges induce problems during powder processing. Triboelectric charges are produced during powder flow at the contacts between the grains and at the contacts between the grains and the container. The presence of these electrostatic charges induces adhesion and cohesiveness leading to intermittent or blocked flow. More serious consequences are possible such as dust explosions. Powder electrostatics is also a concern in major challenges like space exploration.

Unfortunately, the fundamentals behind the triboelectric effect are still poorly understood in the framework of industrial applications and the empirical approach is still the norm.

In this advanced course focused on powder electrostatics, we will review the recent advances in physics from a fundamental point of view before focusing on applications. Moreover, we will show how to perform reproducible electrostatic measurements on powders. Finally, we will see how to take advantage of electrostatic charges in some application or to avoid electrostatic charge build-up in other applications.

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