Influence of electrostatic charges on the particle concentration in wall-bounded turbulent flows
(2018) 8th World Congress on Particle Technology — Location: Orlando, Florida (22.April.2018)
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- Abstract
- Preferential concentration of inertial particles in wall-bounded turbulent flows is of paramount im- portance and, thus, subject of fundamental research. In practical applications of confined particle- laden flows the particles experience frequent collisions with the piping system which may result in an unwanted electric charge separation through triboelectric effects. The consequential occurrence of electrostatic forces alters the particle trajectories and, thus, impairs the general validity of the measured results to an unknown extent. In this work the influence of triboelectric charging on the preferential concentration of inertial particles in a fully developed turbulent duct flow was inves- tigated by means of a combined numerical and experimental approach. The order of magnitude of the potential charge accumulation was estimated and imposed in a parametric study to the par- ticulate phase in the simulations. The simulations demonstrate that the concentration profiles are for the most part independent of the prescribed charge. However, the peaks of the particle num- ber density at the walls caused by turbophoresis are strongly reduced through the local increase of repelling electrostatic forces. The comparison of numerical with experimental data indicates that the particles in the experimental setup are affected by a surface charge density of the order of 40 μC/m 2 . The presented results aim to elucidate the impact of electrostatic forces in the particle distribution in wall-bounded particle-laden flows.
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Grosshans, H., Villafãne, L., Banko, A., & Papalexandris, M. (2018). Influence of electrostatic charges on the particle concentration in wall-bounded turbulent flows. Proceedings, 8th World Congress on Particle Technology, Orlando, FL. Published. 8th World Congress on Particle Technology, Orlando, Florida. https://hdl.handle.net/2078.5/226520