Efficiency of vane pack

The efficiency of the vane type mist eliminator is defined as [3] 

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Finally, reversible-flow cyclones can be used for gas cleansing. These have the highest turndown ratio and good efficiency versus drop size (commercial claim 3 + pm, depending on design). They do, however, have a pressure drop higher than that of vane packs and axial flow cyclones. 

Two special requirements for the effective use of structured packing are efTiciem mist eliminators and uniform iiquid distribution. Kean et al. (1991) recommend a vane type eliminator with a 3- to 4-in. mesh pad face to minimize carry-over. A simple wire-mesh mist eliminator is not considered adequate at the high gas velocities employed with structured packing. They also recommend that a high-efficiency drip-type distributor be used with typical matrix dimensions of 4 in. by 4 in. and the peripheral drip points iocated no more than 2 in. from the wall. The distributor must be installed as close as possible to the packing to ensure good distribution and minimize carry-over. 

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