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A Model for Absorption and Desorption of Fuel Vapour by Cylinder Lubricating Oil Films and Its Contribution to Hydrocarbon Emissions
ISSN: 0148-7191, e-ISSN: 2688-3627
Published February 01, 1983 by SAE International in United States
Annotation ability available
The absorption and desorption of fuel by cylinder lubricating oil films has been modelled using principles of mass transfer. Henry's Law for a dilute solution of fuel in oil is used to relate gas to liquid phase fuel concentrations. Mass transfer conductances in gas and liquid phases are considered, the former via use of Reynold's Analogy to engine heat transfer data, the latter through assuming molecular diffusion through an effective penetration depth of the oil film.
Oxidation of desorbed fuel is assumed complete if the mean of burned gas and lubricating oil film temperatures is greater than 1100K,. Below this value the desorbed fuel is considered to contribute to hydrocarbon emissions.
Comparison with engine test data corroborate the absorption/desorption hypothesis. The model indicates the equal importance of gas and liquid phase conductances.
CitationDent, J. and Lakshminarayanan, P., "A Model for Absorption and Desorption of Fuel Vapour by Cylinder Lubricating Oil Films and Its Contribution to Hydrocarbon Emissions," SAE Technical Paper 830652, 1983, https://doi.org/10.4271/830652.
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