Measurements of ion concentration in gasoline and diesel engine exhaust |
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| Institution: | 1. CFUM-UP, Physics Department, University of Minho, 4800-058 Guimarães, Portugal;2. Department of Control Engineering, Faculty of Electrical Engineering, Czech Technical University in Prague, Technick8 2, 16627 Prague 6, Czech Republic;3. SEG-CEMMPRE, Department of Mechanical Engineering, University of Coimbra, Rua Luís Reis Santos, 3030-788 Coimbra, Portugal;4. IPN - LED & MAT - Instituto Pedro Nunes, Laboratory of Tests, Wear and Materials, Rua Pedro Nunes, 3030-199 Coimbra, Portugal;1. Department of Chemical Engineering, Faculty of Chemistry, Wroclaw University of Science and Technology, Norwida 4/6, 50-373 Wroclaw, Poland;2. Department of Cryogenic, Aeronautic and Process Engineering, Faculty of Mechanical and Power Engineering, Wroclaw University of Science and Technology, Wyb. Wyspianskiego 27, 50-370 Wroclaw, Poland;1. Université Mohammed V, Faculté des Sciences, Département de Chimie, Laboratoire de Physico-chimie des Matériaux et Catalyse (URAC26), Avenue Ibn Battouta, BP. 1014, Rabat, Morocco;2. Hassan II Academy of Science and Technology, Rabat, Morocco;3. Istituto per lo Studio dei Materiali Nanostrutturati (ISMN)-CNR, via Ugo La Malfa, 153, 90146 Palermo, Italy |
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| Abstract: | The nanoparticles formed in motor vehicle exhaust have received increasing attention due to their potential adverse health effects. It has been recently proposed that combustion-generated ions may play a critical role in the formation of these volatile nanoparticles. In this paper, we design an experiment to measure the total ion concentration in motor vehicle engine exhaust, and report some preliminary measurements in the exhaust of a gasoline engine (K-car) and a diesel engine (diesel generator). Under the experimental set-up reported in this study and for the specific engines used, the total ion concentration is ca. 3.3×106 cm?3 with almost all of the ions smaller than 3 nm in the gasoline engine exhaust, and is above 2.7×108 cm?3 with most of the ions larger than 3 nm in the diesel engine exhaust. This difference in the measured ion properties is interpreted as a result of the different residence times of exhaust inside the tailpipe/connecting pipe and the different concentrations of soot particles in the exhaust. The measured ion concentrations appear to be within the ranges predicted by a theoretical model describing the evolution of ions inside a pipe. |
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