The loading of fibrous filters with submicron particles

A numerical study of the effects of loading from diffusive deposition on the efficiency of fibrous filters

“…Experimental investigations in this area include Japuntich et al (1994) and Thomas et al (2001) where the penetration and pressure drop of various filters were considered under loading. Modelling work which has been undertaken in this area includes the semi-empirical models of fibre efficiency as a function of deposit, see Stenhouse et al (1992) and Stenhouse and Trottier (1991). These models are restricted to specific cases and based on limited experimental data.…”

A numerical model of fibrous filters containing deposit

“…The conditions given above on AB are used to reduce the unknowns there to ψ p , ψ' f and ω f by using equation (19) to express ψ f in terms of ψ p , equation (22) to express ω' f in terms of ψ' p and equation (26) to express ψ' p in terms of ψ' f , ω f and ψ p Considering equation (16), this can be written as:…”

“…Approximating the partial derivatives using finite differences and using equation (19), equations (30) and (31) are written in terms of the unknowns ψ p , ψ' f and ω f on AB, ψ' f and ω' f on BCDA and the knowns ψ f and ω f on BCDA . Hence equations (28), (30) and (31) give 2N f +N p equations in the 2N f +N p unknowns: ψ p , ψ' f and ω f on AB ψ' p on BFEA ψ' f and ω' f on BCDA These were solved and then the complete boundary information on AB obtained, using equation (19) to obtain ψ f , equation (26) to obtain ψ' p , and equation (22) to obtain ω' f .…”

Filter Clogging by Bimodal Aerosol

“…The contribution of the other layers to the total pressure drop does not increase during loading if particles do not penetrate the first layer to a large extent. Often a clear discontinuity point can be observed, when the filtration mode is changed from depth filtration to cake filtration (Stenhouse and Trottier 1991). Thomas et al (2001) developed a model to predict the transition.…”