Powder Rheology 5: Wall Friction and Compressibility – Simple but Powerful Powder Parameters
The fifth webinar in the series on powder rheology concentrates on three powder parameters which depend on the applied stresses: wall friction, compressibility, and permeability.
These parameters are easy and fast to measure with the Powder Cell for MCR rheometers and help you get many different powder properties, such as bulk density, as well as characteristics like powder flow, Carr index, and more.
Wall friction is the friction between a powder and a solid surface. This parameter is important when bulk solids flow over solid surfaces, but also for the design of silos, hoppers, bins, and chutes.
Compressibility describes the bulk density behavior in dependence of a consolidation stress. The relation of bulk density before and after consolidation can give indications on flow properties. A rheological measurement yields more precise information than traditional tapping measurements because the bulk density and the flow indicators (Carr index, Hausner ratio) are given in dependence of a specific applied normal stress – as is the case in a real application.
Dr. Abhishek Shetty is a Lead Scientist working at the Advanced Technical center at Anton Paar USA. Dr. Shetty received his BS degree in Chemical Engineering from National Institute of Technology Karnataka and MS and PhD from University of Michigan, Ann Arbor, USA. Dr. Shetty has over 15 years of working experience in academia, CPG and Advanced instrumentation space. He is a named inventor on 2 US patents, has published several peer-reviewed scientific journal articles which have garnered hundreds of citations and also has presented at several scientific technical conferences. As the Lead Scientist at Anton Paar, his responsibilities are to develop next generation materials characterization methods relevant to Anton Paar’s rheology portfolio. Dr. Shetty's work with teams spans across the globe to develop new advanced applications using advanced rheometric tools. His work has been featured in prestigious journals such as Proceedings of the National Academy of Sciences (PNAS), Science Advances, Physical Review Letters (PRL), Journal of Rheology (JOR) etc.
Timothy Aschl is the global product manager for powder rheology at Anton Paar since 2017. He holds a PhD in chemistry from the École Polytechnique, France where he researched biosensors. His Master’s degree in technical physics was obtained from the Technical University of Graz, with a focus on biofuels.
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