Efficient oil mist separation becomes increasingly important i.e. in crankcase ventilation systems. Woven wire meshes pose a high potential to meet the new requirements: Experimental investigations yield highly efficient submicron droplet separation when placing a woven wire mesh in an aerosol stream in cross-flow under a very sharp angle. Comparison between perpendicular and cross-flow-conditions show a lower pressure drop in cross-flow while providing a higher separation efficiency at the same time. Simplified 2-D simulations of parallel cylinders in cross-flow present a complex flow-field with high streamline-curvature in proximity of the wires. The flow field rather resembles a set of miniature impactors due to the stagnation point and the sharp deflection of the flow. The macroscopic velocity-field is inhomogeneous: There is an increase in upstream velocity along the cylinders and a strong deceleration on the downstream side of the screen. 3-D simulations of a reduced section were conducted to visualize the flow through various mesh types and to calculate separation efficiency and pressure drop. Thus dimensionless correlations for the pressure drop of the reduced sections were obtained which will allow modelling of the full channel flow.
Session: G2 - Mist and Droplet Separation II
Day: 13 March 2018
Time: 14:45 - 16:00 h