#### 3D simulation and experimental investigation of the coulomb effect in electret filters

K. Schmidt, IT for Engineering (it4e) GmbH; A. Hellmann, M. Kerner*, S. Antonyuk, University of Kaiserslautern; S. Schumacher, C. Asbach, Institut für Energie- und Umwelttechnik e.V. (IUTA), Germany

Synthetic filter materials are commonly used in automotive, ambient air and industrial chemical processing applications to separate particles from gases. A dominant electric effect influencing the filtration efficiency is the Coulomb effect. In order to understand and control electrostatic aerosol deposition in filter media, it is investigated by 3D direct numerical simulation and laboratory measurements.

The simulation is conducted with the in-house developed software DNSlab. As 3D model of the fiber structure a random distribution of cylinders is used, with an assumed random distribution of spherical spots at the fiber surfaces to model the charge distribution. The flow field is obtained by numerical solution of the Navier-Stokes equations, the electric field is computed by explicit integration of the fiber surface charges. The particles with charge distribution corresponding to Gunn are tracked by the Lagrangian method. The resulting filtration efficiency curves are compared to measurements for different assumptive amounts of the surface charge density...

**Session: **G4 - Electret Filter Media

**Day:** 14 March 2018

**Time: ** 09:00 - 10:15 h

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