What is the function of a demister in a fuel oil purifier?

The function of a demister in a fuel oil purifier is to remove fine droplets of water or other contaminants that may remain suspended in the purified fuel oil after the main separation process. Fuel oil purifiers, typically centrifugal separators, are used to remove water and solid particles from the fuel oil before it is supplied to the engine. However, even after this process, very small droplets of water or oil can still remain dispersed in the fuel. A demister, usually located downstream of the centrifugal separator, promotes the coalescence of these fine droplets into larger droplets. These larger droplets are then more easily separated from the fuel oil by gravity or other means. The demister typically consists of a mesh or a series of baffles that provide a large surface area for the droplets to impinge upon and coalesce. By removing these fine droplets, the demister ensures that the fuel oil supplied to the engine is as clean and dry as possible, preventing corrosion, reducing wear, and improving combustion efficiency.