Print Email Facebook Twitter Stirrer design for improving fluidization of cohesive powder Title Stirrer design for improving fluidization of cohesive powder: A time-resolved X-ray study Author Wu, K. (TU Delft ChemE/Product and Process Engineering; Guangdong University of Technology) Kamphorst, R. (TU Delft ChemE/Product and Process Engineering) Bakker, A.M.T. (TU Delft BT/Industriele Microbiologie) Ford, Jasper (Student TU Delft) Wagner, E.C. (TU Delft ChemE/O&O groep) Ochkin-Koenig, Olga (BASF SE) Franck, Miika (BASF SE) Weis, Dominik (BASF SE) Meesters, G.M.H. (TU Delft ChemE/Product and Process Engineering) van Ommen, J.R. (TU Delft ChemE/Product and Process Engineering) Date 2024 Abstract Stirring has been recognized in the literature as a promising technique for facilitating fluidization of cohesive powders, via inputting additional energy to counteract interparticle forces. However, the influence of operating conditions and stirrer configurations on flow behavior remains largely unknown, which impedes the practical implementation of stirred fluidization. Utilizing X-ray imaging, this research demonstrates that stirring enhances fluidization in cohesive micron-silica powder (Sauter mean diameter [Formula presented]) by collapsing the powder packing structure, and transitioning channeling beds into bubbling states. Comb-like configurations featuring fewer stirrers and blades, placed in the bottom region, have shown to be highly effective. Excessive stirring can lead to air pockets and a compacted phase of particles on the column walls, undermining the interaction between particles and stirrers. Additionally, the experiments show that maximizing the sweeping coverage, employing complex asymmetrical configurations, and avoiding tortuous gas pathways are preferable. Subject Cohesive powderGas channelStirred fluidizationVibrationX-ray imaging To reference this document use: http://resolver.tudelft.nl/uuid:51eccbe2-4788-4657-9449-1b6c918ceab8 DOI https://doi.org/10.1016/j.ces.2024.120069 ISSN 0009-2509 Source Chemical Engineering Science, 294 Part of collection Institutional Repository Document type journal article Rights © 2024 K. Wu, R. Kamphorst, A.M.T. Bakker, Jasper Ford, E.C. Wagner, Olga Ochkin-Koenig, Miika Franck, Dominik Weis, G.M.H. Meesters, J.R. van Ommen Files PDF 1-s2.0-S0009250924003695-main.pdf 5.48 MB Close viewer /islandora/object/uuid:51eccbe2-4788-4657-9449-1b6c918ceab8/datastream/OBJ/view