Inertial Impaction of Aerosol Particles on Cylinders

Abstract

The inertial impaction of aerosol particles on cylinders was investigated to determine the relationship between the efficiency of impaction and the inertial parameter, the Reynolds number of flow, and the effect of interception. The impaction of sulfuric acid aerosols of nearly uniform size ranging from 0.6 to 1.4 microns diameter, on two platinum wires, 29 and 83 microns diameter, and two tungsten wires, 53 and 106 microns diameter, was measured at several velocities of flow past the wires. Reynolds numbers ranged from 13 to 330. For values of the square root of the inertial parameter Ψ½ below 1.4, the experimental efficiencies of impaction agree with those predicted by Langmuir and Blodgett for potential flow and by Landahl and Herrmann for a Reynolds number of 10. The experimental values are higher than the calculated values for Ψ½ greater than 1.4. The theoretical prediction that a critical value of Ψ½ exists at approximately ¼, below which inertial impaction does not occur, was verified.

Study on Performance of Mesoscopic Impactor Filters for Aerosol Removal

“…In 1955, J. 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].…”

High-performance inertial impaction filters for particulate matter removal

“…That is to say, traveling with hot exhausts, PM particles above a certain size possess so much inertial force that they cannot follow the air stream and finally impact with the adhesion layer which is used for capture. The concept of inertial impaction filter was firstly presented in 1955 21 . Over the years, various types of inertial impactors have been designed and developed, majority of which are low flow rate and designed for collection and monitoring of aerosol particles 22 – 32 .…”

Experimental Investigation of Particle Collection on Single Fibres of Different Configurations

“…[12]) is also included. Whereas in the experiments concerning this project the particle rebound off the fibre leads to a reduction in the single fibre collection efficiency for high inertia parameters, the particles in the experiments of Wong et al [12] adhere, leading to a steady increase in the single fibre collection efficiency with increasing inertia parameter. With respect to the interception collection fraction, Eqs.…”

“…With respect to the interception collection fraction, Eqs. (12) and (13) reveal that as far as these investigations are concerned, this plays only an unimportant role. It may be observed that the collection efficiencies determined here for small inertia parameters, where they are approximately equal to the collision efficiencies (h = I), are slightly higher than the theoretical values for the same Reynolds numbers.…”