Filters applied for removal of emulsified water from diesel fuels encounter serious problems in recent 10-15 years, which often leads to operation failure and breakthrough of water into the fuel injection equipment. This can cause a severe damage of common rail systems, which are vulnerable to contamination with solids as well as the presence of emulsified water droplets can cause a very fast wear and damage of the injection nozzles.

The problem of water penetration though filtration units is brought about by changes in the composition of diesel supplied to the market. These changes were imposed by legislation due to environmental concerns, and refer to ultra-low sulphur diesel and biodiesel blends. The experimentally observed foam-like structure of the water droplets collected on hydrophobic filter media show that their coalescence is hindered.

Flow guiding vanes used in prototype.

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