Filtration Behavior of Diesel Particulate Filters (1)

Modelling of diesel particulate filtration in wall-flow traps

“…The Brownian motion contribution to the collection efficiency is calculated through the evaluation of the Brownian diffusivity, taking into account the deviation due to the Stokes-Cunningham coefficient C c [14]. It is worth noticing that the Brownian efficiency Á D is a function of the Peclet number Pe and of the Kuwabara function g(ε) and it depends not only on the porous media characteristics but also on the gas velocity [21].…”

“…This would entail filtration devices being tailored to this end. Experimental [13] and modelling investigations have been carried out with the specific aim of evaluating the collection efficiency of DPFs by resorting to unit cell collector models [8], analogous to a fibrous model, and their modifications taking into account the contribution due to Brownian motions, which represent the most important deposition mechanism for nano-particles [14].…”

Measurement and prediction of filtration efficiency evolution of soot loaded diesel particulate filters

“…However, no results on FE evolution or comparison with experimental data have been provided. Experimental studies of Liu et al (2002), Ohara et al (2007) and Mizutani et al (2007) have measured FE on DPF systems, but their methods do not have the resolution to capture the complete FE evolution accurately. Additionally in these studies, systematic understanding of impact of filter microstructure/geometry properties and test conditions on clean FE and its evolution is missing.…”

Pollutants emission and particle behavior in a pre-turbo aftertreatment light-duty diesel engine

“…Lastly, in the low load operating points F, J, and L (engine load below 10%), there is also a significant decrease in filtration efficiency in the range between 150 nm and 180 nm [40] in the case of the pre-turbo aftertreatment configuration. Since the most penetrating particle size seems to be located at a smaller size, this result may be related to measurement uncertainty in this operating region, since the filtration efficiency in operating points K and Q (engine load from 21% to 25%) is identical.…”