Cellular Ceramic Diesel Particulate Filter

Catalyzed diesel particulate filter modeling

“…DPFs have been researched for close to three decades based on their ability to capture PM or soot with approximately 100% efficiency (Springer and Stahman 1977, General Motors 1979, Tessier et al 1980, Howitt and Montierth 1981. In the early market introduction, a fibrous type of DPF was used, which trapped the PM according to the classic theory of aerosol filtration, as shown in Figure 1 (Oh et al 1981, Shadman and Bissett 1983, Garner and Dent 1988.…”

“…With the aid of targeted engine experiments, it is possible to calibrate reliably the product of PM density and permeability when the performing loading events under steady-state conditions (Haralampous et al 2004b,c ). Regarding the density of the soot cake layer, literature data on its value appear in the pioneering work of Howitt and Montierth (1981) . They report values between 50 and 60 kg m -3 by weight and layer thickness measurements in cordierite filters with pressure drops below 150 mbar.…”

“…The porous wall DPF consists of a honeycomb of long channels similar to the traditional catalytic converter (Howitt and Montierth 1981 ). Unlike the catalytic converter, the manufacturer now blocks alternating open channels of the honeycomb, so all of the flow entering the device must pass through a porous wall as illustrated in Figure 2 .…”

Update on the Science and Technology of Diesel Particulate Filters

“…Geometric configurations of filters are listed in Table 1 35,36) . The wall-flow monolith honeycomb design originally introduced in 1981 37) still remains the most popular configuration, since it is a ver y compact arrangement, thus exhibiting a low pressure drop without having to make sacrifices in filtration rate or available space.…”

Experimental investigation of catalytic soot oxidation and pressure drop characteristics in wall-flow diesel particulate filters

“…Wall flow ceramic monoliths, which are derived from the flow-through cellular supports used for catalytic converters, became the most common type of diesel filter substrate (originally reported by Howitt and Montierth [22]). It is a honeycomb structure made from porous ceramic material.…”