So, these models are not flexible enough to handle changes in operating conditions. Juliet Eilperin Thanks to recent technological progress in computation, it becomes more feasible to use detailed theoretical models and obtain more realistic results. The formation of soot depends strongly on the fuel composition. Phenomenological soot models, which may be categorized as semi-empirical models, correlate empirically observed phenomena in a way that is consistent with the fundamental theory, but is not directly derived from the theory. Semi-empirical models reduce the size of chemical mechanisms and use simpler molecules, such as acetylene as precursors. From Wikipedia, the free encyclopedia. Diesel exhaust DE gas is a major contributor to combustion -derived particulate-matter air pollution.
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