Filtration of soot-in-oil aerosols: Why do field and laboratory experiments differ?

Aerosol-mist coalescing filters – A review

“…13. These are based on the work of Bredin et al [18], Frising et al [41] and Mead-Hunter et al [71].…”

“…Bredin et al [18] considered horizontal capillaries to develop a phenomenological model to describe the process of liquid removal from saturated filters using a 'pulse jet' cleaning method. The model works well in the initial stages of filter cleaning when capillary processes predominate, though as highlighted by the authors, may not be applicable when capillarity is less significant.…”

“…The model works well in the initial stages of filter cleaning when capillary processes predominate, though as highlighted by the authors, may not be applicable when capillarity is less significant. The work by Bredin et al [18] is however the first to examine the cleaning of saturated liquid aerosol coalescing filters with a pulse jet.…”

“…The saturation model developed by Mead-Hunter et al [73] is a capillary based model, as is the phenomenological model presented by Bredin et al [18]. As a number of media types display varying levels of capillarity, capillary based models form an important part of coalescence filtration theory, and have the potential to act to further knowledge of liquid transport and distribution (and hence saturation) within coalescing filters.…”

“…Bredin et al [18] used a series of field and laboratory tested filters to study the behaviour of filters subject to soot-in-oil aerosol. This work found that, when used in discontinuous operation, the final equilibrium pressure drop was high for filters exposed to soot-in-oil aerosol than for those exposed to clean oil aerosol and the final equilibrium pressure drop increased with increasing soot concentration.…”