Void fraction describes the open volume inside a wire mesh mist eliminator. It influences gas capacity, pressure drop, liquid drainage, and fouling tolerance, and should be considered together with mesh density, wire diameter, pad thickness, and process load.

Mist eliminator segmentation should be designed before fabrication based on manway access, section weight, support layout, joint continuity, orientation, and maintenance requirements. Poor segmentation can cause installation problems, mesh distortion, and gas bypass.

Support grids and hold-down systems affect mist eliminator strength, gas distribution, drainage, segmentation, bypass control, and installed mesh geometry. Mechanical and hydraulic requirements should be reviewed together.

Demister pad thickness can increase droplet interception, but it also increases pressure drop, liquid holdup, weight, and drainage demand. Thickness should be selected together with mesh structure, gas load, liquid loading, fouling condition, and installation geometry.

Mesh density alone cannot define wire mesh demister performance. Wire diameter, surface area, void fraction, compression, pad thickness, gas velocity, liquid loading, and fouling conditions all influence how a mesh behaves in service.