Particle collection efficiency of small inertial impactors considering particle gravitational effect

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作者：
机构：
[1] Huang, C.-H.
[2] Tsai, C.-J.
[3] Shih, T.-S.
来源：
Huang, C.-H. | 2000年 / Elsevier Science Ltd, Exeter, United Kingdom卷 / 31期
关键词：
Aerosols - Algorithms - Computational fluid dynamics - Computer simulation - Curve fitting - Flow visualization - Gravitational effects - Mathematical models - Nozzles - Particle size analysis - Reynolds number - Runge Kutta methods;
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摘要：
The effect of gravitational force on particle collection efficiency in small inertial impactors was investigated. Collection efficiency data were also obtained for a single nozzle, 2-stage cascade impactor. Results show that gravity increases the collection efficiency at the same √St, the Stokes number based on the nozzle diameter, only when the Reynolds number is low and the effect is negligible at high Reynolds number. Gravity affects the collection efficiency only for the stage with larger cutoff aerodynamic diameter for a small impactor.
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