Numerical and Experimental Investigation of the Effect of Droplet Collision Regime to Surface on the Performance of the Separation of Water Droplets from Air in a Zigzag Demister

In the present study, the performance of zigzag demister has been numerically investigated for the separation of dispersed liquid droplets from the gas flow. In general, liquid droplets are dispersed from the gas flow in contact with the vane demister and the formation of the liquid film. Depending on the energy of the droplet collision to the surface, it is likely to occur splash drop into smaller droplets, which will reduce the separation efficiency of the system. In this study, by focusing on the flow collision regime near the surface, it is attempted to investigate the effect of the flow parameters and vane geometry on the separation efficiency and the pressure drop of flow. The Euler-Lagrange is used to simulate the flow and particle motion path. In this research, an experimental model is designed and constructed. Numerical solver results are validated, using the experimental data. The result of this study shows that separation efficiency decreased with increasing gas flow velocity, such that by increasing the 2.5 times of gas velocity, the separation efficiency will lead to a 10% decrease. It was also found that increasing the diameter and increasing the droplet would increase the separation efficiency. On the other hand, choosing the geometry of vane has a significant effect on the amount of the pressure drop of the passing flow. In a way that, by increasing the 50% of the vane angle, the pressure drop will increase 5 times.