Development of a Sharp-Cut Inertial Filter Combined with an Impactor

Tong Zhang ； Hideaki Takahashi ； Mitsuhiko Hata ； Akira Toriba ； Takuji Ikeda ； Yoshio Otani ； Masami Furuuchi

《Aerosol and Air Quality Research》 17卷2期 (2017/02) Pp. 644-652

https://doi.org/10.4209/aaqr.2016.07.0293

摘要

A layered mesh inertial filter that was previously developed by the authors, was combined with an impactor, in which the collection efficiency curve overlaps that of the inertial filter, in order to provide a sharp-cut separation tool for aerosol nanoparticles operating at a moderate pressure drop of less than 10–15 kPa. The separation performance of the proposed “hybrid inertial filter” of the inertial filter and an impactor, such as cut-off size, steepness of the collection efficiency curve and pressure drop ΔP, was evaluated for a single nozzle type in order to confirm the proposed system. The performance of the single nozzle type, which can be used as a unit of a multi nozzle type, was compared with that of the previous type layered mesh inertial filter with a stainless steel fiber mat. The hybrid inertial filter was found to have a collection efficiency curve with a much better steepness at less ΔP compared to those of the previous type for particles with the same cut-off size: a cut-off size d_(p50) of 100 nm with steepness d_(p84)/d_(p16) = 1.7, e.g., was obtained at ΔP ~12 kPa while d_(p84)/d_(p16) = 2.4 at ~16 kPa was found for the previous type.

關鍵字

Nanoparticle measurement ； Impactors ； Filtration ； Samplers ； Ambient ； Classification