Current designs of liquid/gas separating equipment often use vane-type separators because of their high gas capacity and reduced size, weight and cost. To gain insight into the performance of vane-type separators, we have simulated two dimensional flow fields of mist using the computer code PHOENICS. Trajectories of liquid droplets in the flow field were calculated. Apart from the overall separation efficiency, we calculated the liquid droplet size distribution at the outlet of the separator for a given droplet size distribution at the inlet. We began with a simplified geometry of vane channels and modelled the hydrodynamic effects of rear pockets using ’deflector plates’. Results from the model study point to an optimal condition when the vane separator has a high separation efficiency and requires a low pressure drop between the inlet and the outlet of the channel. We then used the body fitted coordinates in a more realistic vane channel to study effects of flow velocity and vane geometries on separation efficiency and pressure drop. It has been found that the performance of vane separators is poor at low flow velocity (<3-4 ms(-1)) and the separation efficiency does not increase much when the velocity is above similar to 10 ms(-1). The pressure drop, on the other hand, increases greatly at high velocity. Larger bend angles result in higher separation efficiency, but when the angle is above similar to 75 degrees, improvement on separation efficiency is small, whereas the pressure drop increases rapidly. Rear pockets increase the separation efficiency, being more effective than increasing the bend angles.