Enhancement of Collection Efficiency of an Inertial Impactor Using an Additional Punched Impaction Plate

Abstract

In this study, the collection efficiency of a round-nozzle inertial impactor was enhanced through use of an additional punched impaction plate. The additional plate was installed between the nozzle outlet and the existing impaction plate. To determine its effect, a simulation and an experiment were conducted. A parametric study was performed on a PM 2.5 inertial impactor to improve the optimum efficiency based on the hole diameter of the additional plate and its distance from the existing plate. As a result, the cut-off size was reduced by 27% from 2.52 µm to 1.84 µm. The effect of the additional punched impaction plate on PM 1 and PM 10 inertial impactors was also investigated. The improvement in efficiency could be observed even when the additional punched impaction plate had varying Reynolds numbers and nozzle sizes. Accordingly, the (Stk 50 ) 0.5 value was reduced by 25% from 0.49 to 0.37 by adding a punched impaction plate in a roundnozzle inertial impactor.

Study on Performance of Mesoscopic Impactor Filters for Aerosol Removal

“…B. Wong first proposed the use of mesoscopic inertial impactor to filtrate aerosols [8]. In recent years, many scientists have devoted to the design and development of the inertial impactor [9][10][11][12][13][14][15][16][17][18]. Because of its simple structure, low flow resistance, and high-efficiency performance, the inertial impactor has been widely used to collect and monitor the aerosol particles.…”

Inertial Impaction Technique for the Classification of Particulate Matters and Nanoparticles: A Review

“…et al, 2014;Heo J.E. et al, 2018), using an additional punched impaction plate installed between the nozzle outlet and impaction plate (Cheon T.W. et al, 2017), and the combination of the impactor and the initial filter to achieve a sharp collection efficiency curve (Zhang T. et al, 2017;Zhang X. et al, 2018).…”

Performance Evaluation of a Virtual Impactor with an Additional Pretreatment Structure for Particle Separation

“…(Kim et al, 2009). In the virtual impactor design, their aerodynamic diameter was defined as (Lee et al, 2017):…”

“…Besides, some novel structures have also been discovered to improve the collection efficiency curve. For example, Cheon et al added an additional punched impaction plate between the nozzle outlet and the existing impaction plate to improve the collection efficiency and reduce the cut-off diameter by changing the particle trajectories (Cheon et al, 2017). Lee et al also proposed an inertial impactor with vertical annular nozzle to separate particles, as a result, it will increase the pressure slightly but increase collection efficiency significantly (Lee et al, 2019).…”