It is known that the dynamics of particles dispersed in turbulent flows can be significantly altered by electric charges and external electric fields. The next step therefore involves the investigation of whether these electric interactions can be exploited in engineering applications to control processes involving the transport of particles in turbulence. In this study, direct numerical simulations of incompressible turbulent channel flows laden with a positively isocharged suspension of monodisperse small inertial particles are employed to investigate the effect of electric charges carried by the particles on their dispersion, and to illustrate the intentional abatement of turbophoretic effects using incident electric fields. An Eulerian-Lagrangian formulation is employed along with a fast multipole method for the electric potential conveniently corrected with wall boundary conditions. Operating conditions are identified in terms of characteristic dimensionless parameters where an AC electric field applied across the channel walls decreases the time-averaged concentration of particles near the walls by up to two orders of magnitude.

Mitigation of turbophoresis in particle-laden turbulent channel flows by using incident electric fields / Di Renzo, M.; Johnson, P. L.; Bassenne, M.; Villafañe, L.; Urzay, J.. - In: PHYSICAL REVIEW FLUIDS. - ISSN 2469-990X. - ELETTRONICO. - 4:12(2019). [10.1103/PhysRevFluids.4.124303]

Mitigation of turbophoresis in particle-laden turbulent channel flows by using incident electric fields

Di Renzo, M.
;
2019-01-01

Abstract

It is known that the dynamics of particles dispersed in turbulent flows can be significantly altered by electric charges and external electric fields. The next step therefore involves the investigation of whether these electric interactions can be exploited in engineering applications to control processes involving the transport of particles in turbulence. In this study, direct numerical simulations of incompressible turbulent channel flows laden with a positively isocharged suspension of monodisperse small inertial particles are employed to investigate the effect of electric charges carried by the particles on their dispersion, and to illustrate the intentional abatement of turbophoretic effects using incident electric fields. An Eulerian-Lagrangian formulation is employed along with a fast multipole method for the electric potential conveniently corrected with wall boundary conditions. Operating conditions are identified in terms of characteristic dimensionless parameters where an AC electric field applied across the channel walls decreases the time-averaged concentration of particles near the walls by up to two orders of magnitude.
2019
Mitigation of turbophoresis in particle-laden turbulent channel flows by using incident electric fields / Di Renzo, M.; Johnson, P. L.; Bassenne, M.; Villafañe, L.; Urzay, J.. - In: PHYSICAL REVIEW FLUIDS. - ISSN 2469-990X. - ELETTRONICO. - 4:12(2019). [10.1103/PhysRevFluids.4.124303]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11589/203268
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