Vane packs, with wire mesh separators, are the most widely used internals when the need is to separate liquid droplets carried by gaseous streams. 

SEPARATION: vane packs are composed by sets of vane profiles where the gas passes through and, changing direction, it clashes on the vanes and are captured by the hooks. Liquid droplets slide down along the vanes and are drained down by a tube into the liquid section of the vessel.
CROSSING SPEED: Usually, compared with wire mesh separators, the crossing speed is higher and that allows to reduce the crossing area and the vessel diameter.
PERFORMANCES: on the other side, the diameter of the smallest separated liquid droplet is bigger then in a wire mesh separator. For this reason vane packs are not indicated when high performance of separation are requered.

vane packs scheme
Left: vane pack customized for separation in small vessels
Center: explanation of droplets interception in different kinds of vane pack
Right: a vane pack for vertical vessels