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• W4313551387 abstract "Abstract The dynamics of the transported powder determines the functionality and safety of pneumatic conveying systems. The relation between the carrier gas flow, induced by the flown‐through geometry, and the powder flow pattern is not clear yet for electrostatically charged particles. This paper highlights the influence of relatively minor cross‐sectional secondary flows and electrostatic forces on the concentration and dynamics of the particles. To this end, direct numerical simulations (DNS) capture the interaction of the continuous and dispersed phases using a four‐way coupled Eulerian–Lagrangian strategy. The transport of weakly charged particles in channel flows, where turbopheresis defines the particle concentration, is compared to duct flows, where additional cross‐sectional vortices form. For both geometries, the Stokes number () and the electrical Stokes number () are varied, and the turbulent carrier flow was fixed to . The presented simulations demonstrate that secondary flows, for the same , , and , dampen the effect of particle charge. In a duct flow, vortical secondary flows enhance the cross‐sectional particle mobility against the direction of electrostatic forces. Compared to a duct flow, in a channel, the wall‐normal aerodynamic forces are weaker. Thus, electrical forces dominate their transport; the local particle concentration at the walls increases. Further, electrostatic charges cause a stronger correlation between the gas and particle velocities. In conclusion, despite being weak compared to the primary flow forces, secondary flow and electrostatic forces drive particle dynamics during pneumatic transport." @default.
• W4313551387 created "2023-01-06" @default.
• W4313551387 creator A5067796164 @default.
• W4313551387 date "2023-01-26" @default.
• W4313551387 modified "2023-10-18" @default.
• W4313551387 title "Influence of weak electrostatic charges and secondary flows on pneumatic powder transport" @default.
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• W4313551387 doi "https://doi.org/10.1002/cjce.24824" @default.
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