The two phase separation can be divided in:
1 - Gas/liquid separation
2 - Liquid/liquid separation
3 - Gas/solid separation
In all these cases both wire mesh separators and vane pack separators can be used to eliminate liquid droplets or separate two liquids or solid particles but, the choose of which technology apply as to carefully checked in function of work conditions, cross velocity and requested performances.


The most common separator used to eliminate liquid droplets from a gas flowrate are wire mesh pads and vane packs.

Wire mesh pads: the metallic wire mesh layers form a very dense cellular structure. Passing through it, the liquid drops are captured by the coalescent effect of the mesh. Then they are eliminated by gravity.

schema vessel
Separation of liquid droplets from a gas flow using a wire mesh demister

- Vane packs: this separators are made with a variable number of vanes (with or without hooks). Vanes and hooks intercept and separate the liquids droplets passing through the pack.

vane pack scheme 
Separation of liquid droplets from a gas flow using vane pack separator

- Efficiency: wire mesh separators can separate smaller droplets (usually till 3 microns of diameter) compared with vane packs (usually till 8/10 microns).
- Velocity: on the other side wire mesh demisters usually work with a very low velocity and vane packs can afford velocity very much higher.
When high efficiency of separation and high crossing speed are the working condition is possible to mesh the wire mesh and vane separators using an "High performance vane pack".


Plate pack scheme
Schemes of liquid-liquid separation made with plate pack and wire mesh coalescer

In this case the internals provide the separation of two immiscible liquids. This operation can be performed by two differnts kind of internal:

- Wire mesh coalescer: made by wire mesh as the demisters but with different kind of layers and a bigger thickness.
- Plate pack separators: made by parallel plates crossed by the liquid flow.
- Velocity and performances: as in the case of gas/liquid separation the wire mesh internal needs crossing speed lower than plate plate but allows higher performances.

Advantagies: Liquid/liquid separation allows to obtain some of these advantages:
- reduction of dimensions and costs of vessels
- increasing of the purification of products
- decreasing of the loosing of glicol, ammine and other expensive chemical elements


demister aria1 3
Demister in a desalination plant
Wire mesh cell

In this case wire mesh demisters are used to eliminate solid particulate from a vapour or a gas.

Some common application are:
- desalination plants, where salt is separated from the air flow. The intercepted droplets of salt become solid inside the mesh pad and, after some time, the demister needs to be changed.
- air filtration and purification needed in a lot of different industrial and food process
- filtration of solid particulate coming from some mechanical processes like, for example, drawing of metallic wire.