Validation: Flow, Filter Efficiency and Electrostatic Effects in Complex Filter Media
Validierung: FilterDict und FlowDict
The validation of GeoDict filtration simulations was performed within the ElekSim project in cooperation with the “Institut für Umwelt & Energie, Technik & Analytik e.V. (IUTA)”. In this study, filter samples with different geometries, shapes, and dimensions were investigated to assess the predictive accuracy of GeoDict for realistic filter media.
In this validation the results for sample A of this study is presented. The 3D geometry of this sample is shown on the left side of Figure 1.
As a first validation step, the Navier–Stokes flow simulations were compared with corresponding air permeability measurements, confirming that GeoDict accurately predicts the flow resistance of the investigated filter structures. The experimental value for the flow permeability measurement at 200 Pa was 1300 ± 250 l/(m2*s) and the simulation result on the cut-out of the segmented CT-scan was 1510 l/(m2*s). ). So we observe a very close match between the experiment and the simulation.
Based on the validated flow fields, filtration efficiency simulations were then performed for both physical filtration, measured after discharge in isopropanol, and electrostatic filtration effects caused by charged fibers. GeoDict’s predicted filtration efficiencies showed close agreement with the corresponding experimental measurements for both uncharged (see Figure 1) and charged filter media (see Figure 2), demonstrating that the software can accurately capture mechanical as well as electrostatic particle separation mechanisms.
The successful validation of both air permeability and filtration efficiency across different structural types confirms the robustness and reliability of the GeoDict modeling approach and demonstrates its suitability as an effective tool for the virtual design and optimization of advanced filtration systems.
