Collection Efficiency of Fibrous Mat Filters with Dust Loads

Abstract

A capture mechanism of aerosol particles in fibrous mat filters with dust loads was studied, and a method for estimating the collection efficiency of the fibrous mat filter is presented by using an interception model.
Aerosol particles accumulate on a fiber surface as a filtration process proceeds; this leads to a drastic increase in the collection efficiency of the filter. In this work, it was assumed that a layers of captured particles built up on the front of the fiber and interception by these captured particles was the predominant mechanism of the filtration process of the fibrous mat filter. To obtain the increment of a single fiber collection efficiency due to dust loads, an approximate equation was derived by using Happel's flow field around a cylinder. The correction factor, K, for the mean solidity of the layers of captured particles could be determined experimentally as a function of interception parameter, N_R, and inlet dust load m₀.