| Zugriffsnummer | 54821 |
| Dokumenttyp | Zeitschriftenartikel |
| Peer Review | mit Peer Review |
| Sprache | Englisch |
| Titel | Secondary flows drive triboelectric powder charging in pneumatic conveying |
| Autor(in); Institution | |
| Quelle/Jahr | Journal of Fluid Mechanics: 1007 (2025), A52, 1 - 28 |
| ISSN | 0022-1120 (print) ; 1469-7645 (online) |
| DOI | |
| URL | |
| Verlag | Cambridge: Cambridge University Press |
| Zusammenfassung | Highly resolved simulations reveal the fundamental influence of a carrier fluid’s flow dynamics on triboelectric powder charging. We found that particles transported through a square-shaped duct charge faster than in a channel flow caused by secondary flows that led to more severe particle–wall collisions. Specifically, particles with a Stokes number of 4.69 achieve 85 % of their equilibrium charge approximately 1.5 times faster in duct flow than in channel flow. Also, charge distribution is more uniform in a duct cross-section compared with a channel cross-section. In channel flow, particles are trapped near the walls and collide frequently due to limited movement in the wall-normal direction, causing localized charge buildup. In contrast, duct flow promotes better mixing through secondary flows, reducing repeating collisions and providing uniform charge distribution across the cross-section. Upon charging, electrostatic forces significantly reshape particle behaviour and distribution. Once the powder achieves half of its equilibrium charge, particles increasingly accumulate at the wall, leading to a reduced concentration in the central region. These changes in particle distribution have a noticeable impact on the surrounding fluid phase and alter the overall flow dynamics. These findings open the possibility for a new measure to control powder charging by imposing a specific pattern. |
| Themenbereich der Metrologie | Physikalische Sicherheitstechnik, Explosionsschutz |
| Innovationscluster | Energie |
| Forschungsprojekt | PowFEct |
| Förderinformationen (1) |
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 |