The effect of discontinuous injection on particle backflow in pneumatic conveying systems
Autor(in); Institution
Obukohwo, Otome; Department of Chemical and Biological Engineering, University of Ottawa, Ottawa, Ontario, CANADA
Sowinski, Andrew; Department of Chemical and Biological Engineering, University of Ottawa, Ottawa, Ontario, CANADA
Mehrani, Poupak; Department of Chemical and Biological Engineering, University of Ottawa, Ottawa, Ontario, CANADA
Grosshans, Holger; 3.5, Explosionsschutz in der Energietechnik, PTB-Braunschweig; Institute of Apparatus and Environmental Technology, Otto von Guericke University of Magdeburg, Magdeburg, GERMANY
Quelle/Jahr
Canadian Journal of Chemical Engineering: 103
(2025), 11, 5680
- 5689
Pneumatic conveying is used in many process industries to transport dry, granular, and powdered solids. The triboelectrification of particles during conveying causes particle agglomeration, spark discharges, and disruptions in particle flow, making particles move upstream against the fluid flow. The effect of frequency of particle injection on particle backflow is studied using CFD-DEM simulations. Conveying flow in a square-shaped duct with fluid frictional Reynold’s number equal to 180, particle Stokes number equal to 8, and individual particle charge equal to 504 fC, is simulated with different particle injection frequencies. The proportion of particles moving upstream is found to increase as the delay period between injections increases, and the effect of the length of the injection period is minimal. Further, particles moving upstream are situated in low-drag zones at the corners of the duct where the electrostatic force dominates. In conclusion, the delay period between discontinuous injections plays a major role in particle backflow. The findings of the article are important for industrial processes with discontinuous injection of particles with a risk of particle accumulation within the conveying boundary.
Förderername: European Research Council (ERC)
Förderer ID: 0000 0000 8923 0953
Förderer ID Typ: ISNI
Titel der Förderung: PowFEct
Förderungsnummer: 947606
URI der Förderung:
https://cordis.europa.eu/project/id/947606/de
Zitierung
Obukohwo, O., Sowinski, A., Mehrani, P., & Grosshans, H. (2025). The effect of discontinuous injection on particle backflow in pneumatic conveying systems. Canadian Journal of Chemical Engineering, 103(11), 5680–5689. https://doi.org/10.1002/cjce.25734
