2022/01/23 by Holger Großhans, Wenchao Xu, Grosshans, Holger +3 · 1 citation
Engineering · #Aerosol Filtration and Electrostatic Precipitation #Electrostatic Discharge in Electronics #FOS: Physical sciences #Fluid Dynamics (physics.flu-dyn) #Granular flow and fluidized beds #Soft Condensed Matter (cond-mat.soft)
paper · pdf · doi:10.48550/arxiv.2201.09244
openalex publication_date 2022/01/23 · openalex created_date 2022/04/03 · openalex updated_date 2026/08/01
Thus far, simulations have failed to predict accurately electrostatic powder charging during pneumatic transport. We advanced the modeling of powder flow charging by a three-part study: first, we shot individual particles on a metal target and measured the exchanged charge. Second, based on these results, we formulated an empirical model and implemented it in our CFD tool. Using this tool, we performed large-eddy simulations of the powder flow through a square duct with a cylindrical obstacle inside. Finally, we compared the simulations to measurements in our pneumatic conveying test rig. The simulations successfully predicted the charging of powder consisting of monodisperse particles of a size of 200 μm. Contrary to the usual procedure for this type of simulation, the tool requires no tuning of any parameters. According to our simulations, the powder mostly charged when hitting the cylindrical obstacle. The contacts led to bipolar charge distributions.