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Capturing aerosol droplets with fibers

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Capturing droplets from a stream with a fibrous material is a well-known and well-used process, from coalescence filters to fog harvesting. In this paper, we report experimental measurements of collection efficiency with a model system consisting in an array of vertical nylon fibers. In particular, we report precise measurements over a large range of parameters, and identify the key role played by the drop distribution on the overall collection efficiency. Due to a growth and coalescence process, this drop distribution evolves toward a regular pattern of uniformly distributed drops, and a balance between capillarity and gravity sets an average drop size. Accounting for these effects in a simple inertial impaction model allows predictive and quantitative comparisons with experiments. Drop growth can be suppressed by forming long continuous liquid columns between close fibers; incoming droplets immediately coalesce with these wet columns, and the capture efficiency is increased. In addition, we extend our model to take into account the interactions between fibers.

Graphical abstract: Capturing aerosol droplets with fibers

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The article was received on 17 Jun 2019, accepted on 25 Jul 2019 and first published on 26 Jul 2019

Article type: Paper
DOI: 10.1039/C9SM01205B
Soft Matter, 2019, Advance Article

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    Capturing aerosol droplets with fibers

    R. Labbé and C. Duprat, Soft Matter, 2019, Advance Article , DOI: 10.1039/C9SM01205B

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