Vane packs, with wire mesh separators, are the most widely used internals for the separation of liquid droplets carried by gaseous streams. 

SEPARATION: vane packs are composed of sets of vane profiles where the gas passes through and, changing direction, clashes on the vanes being captured by the hooks. Liquid droplets slide down the vanes and are drained down by a tube into the liquid section of the vessel.
CROSSING SPEED: in comparison with wire mesh separators, the crossing speed is higher allowing a reduction of the crossing area, of the separator and of the vessel diameter.
PERFORMANCES: the diameter of the smallest separated liquid droplet is bigger than in a wire mesh separator. For this reason vane packs are not recommended when a high separation performance is required.

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