Aerosol filtration is one of techniques used to remove the particles from the air stream using the fibrous filters and so it has many industrial applications like dehumidification, automobile filters; exhaust filters which separates particles as well as liquid droplets from air source which is important in concern with environmental aspect. So even a small improvement in the performance of the coalescing filters can lead to better economy. The performance of coalescing filters can be improved by adding optimum amount of nanofibers as well as putting drainage channels in the filter media. Nylon nanofibers of about 150 nm are added in micro-glass fibers of 2 to 5 micron size for different area ratios. It was observed that the relative quality factor increases rapidly for small area ratios, it passes through a maximum for area ratio of about 1.0, and gradually declines for larger area ratios. The experimental results indicate that the optimum relative quality factor occurs for 0.1 grams of nylon nanofibers added to 2.0 grams of glass fibers, or about 5 % nanofibers by mass. One more approach for increasing the performance of coalescing filters is by incorporating the drainage channels in the filter media as well as by changing the orientation of the filter media. The paper also discusses various geometries of filter media in different orientations.
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