Abstract
Diesel fuel emulsions have demonstrated reductions of unwanted combustion emissions. Glycerol, a renewable and abundant resource, is an attractive fuel component because it is a low-cost energy source. In this paper, the glycerol–diesel emulsion system is characterized and resultant fuel properties are presented. Surface analytical techniques and long-term stability evaluations are used to identify optimal surfactant composition. Emulsions are prepared using batch ultrasonic processing to produce a narrow droplet size distribution with a mean of approximately 3.3 μm. The glycerol water content tends to increase the droplet size distribution. Glycerol–diesel emulsions prepared at 10 and 20 vol % glycerol phase are combusted in a naturally aspirated single-cylinder diesel engine. Oxides of nitrogen and particulate matter emissions are reduced by 5–15 and 25–50%, respectively. Indicated fuel consumption is increased corresponding to an increased glycerol concentration because of a reduction in the emulsion e...
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