1. Filter media with uniform wetting property presented 'U' shape saturation distribution. 2. Filter media with composite wetting properties also presented 'U' shape saturation distribution but with some variation approaching the interface. 3. Filter with low wetting property can work like a barrier slowing down drops from penetrating filter medium. 4. Drops may both like to be retained in the oil-wetting layer and concentrate at the interface between. 5. Efficiency and QF didn't show significant difference among comparisons.
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