| Issue |
EPJ Web Conf.
Volume 340, 2025
Powders & Grains 2025 – 10th International Conference on Micromechanics on Granular Media
|
|
|---|---|---|
| Article Number | 11008 | |
| Number of page(s) | 4 | |
| Section | Powders and Grains in Pharma- and Food Processes | |
| DOI | https://doi.org/10.1051/epjconf/202534011008 | |
| Published online | 01 December 2025 | |
https://doi.org/10.1051/epjconf/202534011008
Low to high shear rate powder rheology in a rotational rheometer
1 Dipartimento di Ingegneria Industriale, Università degli Studi di Salerno, Fisciano (SA), Italy
2 Multi-Scale Mechanics (MSM), Thermal and Fluid Engineering, Faculty of Engineering Technology, University of Twente, Enschede, Netherlands
3 MercuryLab B.V., Enschede, Netherlands
4 Soil MicroMechanics (SMM), Civil Engineering and Management, Faculty of Engineering Technology, University of Twente, Enschede, Netherlands
* Corresponding author: This email address is being protected from spambots. You need JavaScript enabled to view it.
Published online: 1 December 2025
Abstract
Characterization techniques are essential for understanding powders’ complex behavior. Among different devices, the Anton Paar Powder Rheometer (MCR-302) was used to characterize high-density polyethylene (HDPE). The powder has a 214 μm median diameter and is classified as free-flowing. The rheometer measures the torque required to rotate an impeller within the powder cell over a wide range of impeller rotation velocities from 0.6 rpm to 600 rpm. The steady-state torque dependence on the rotation velocities of the impeller follows a function (similar to shear thickening) as in the mu-I-rheology, reflecting that the torque is sensitive to inertial/viscous effects at higher rotation velocities (60 and 600 rpm) while quasi-static at lower rotation velocities (0.6 and 6 rpm). Our results indicate that the dry air fluidization at 600 rpm has a minimal effect on the steady-state torque.
© The Authors, published by EDP Sciences, 2025
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