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Development and Characterization of aerosol conditioning devices for Solid Ultrafine Particle Measurement from Diesel Engines: A Review
ISSN: 0148-7191, e-ISSN: 2688-3627
To be published on April 06, 2021 by SAE International in United States
Event: SAE WCX Digital Summit
Emission regulations mandate the measurement of solid particles of size greater than 23 nm according to particle measurement protocol (PMP). The analysis of solid particles from diesel engines requires the use of aerosol conditioning systems which can remove effectively volatile particles/species with minimum solid particles losses. Two types of aerosol conditioning devices (thermodenuder and catalytic stripper) are used for the measurement of solid ultrafine particles emitted from the diesel engine. This paper reviews the recent literature related to design and operating characteristics (temperature profile, particle losses, penetration efficiency) of the thermodenuder and catalytic striper. The origin of various particle losses such as due diffusion, thermophoresis, sedimentation in these devices is discussed. Further theoretical calculation using the empirical equation of these particle losses is also described. The merit and demerit of sampling diesel aerosols from the thermodenuder and catalytic striper are discussed. Finally, the effect of engine operating conditions on non-volatile emissions sampled with catalytic stripper and thermodenuder is presented.