Pore-scale studies of ceramic exhaust filters

Mark  Stewart, PNNL

Several important aspect of exhaust filter performance, including backpressure and filtration efficiency, are heavily influenced by the structure of micro-scale flow passages through the filter wall. A number of filter substrates, having a range of porosities and pore size distributions, were examined using micro X-Ray CT and pore-scale flow simulations.  Predictions of wall permeability and filtration efficiency were compared to data from fundamental experiments.  Possible approaches to improving device-scale filter models are discussed.

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