Abstract
This work describes the performance of the midget impinger for submicron aerosols. Collection efficiencies of the midget impinger were investigated numerically and experimentally. Flow fields in the midget impinger were solved using FLUENT, which is a computational fluid dynamics software and calculates RNG k-ε model for intermediate Re number, k-ε model for high Re number, and laminar flow model. Polystyrene latex (PSL) particles ranging from 0.10 to 3.1 μm and monodisperse diethyl-hexyl-sebacate (DEHS) mist ranging from 0.3 to 1.5 μm were aerosolized and introduced into the midget impinger. These theoretical and experimental results show a good agreement. The impinger shows poor performance for submicron particles and bubbling in the impinger contributes to 10% higher collection efficiency for submicron mist particles than that without water filling. PSL particles larger than 0.6 μm show bounce off the bottom surface of the impinger.
