The intention of this study is to investigate the effect of surfactant over a water-diesel mixture to make an emulsified fuel. The total surfactant concentration in each of the diesel-water emulsion samples studied (span 20, span 80, tween 20, tween 80) is fixed at 1% w/w. The water content is variable at 5-15% w/w. The non-ionic surfactants used in this study tend to reduce the interfacial tension between water and diesel giving rise to a new fuel with increased burning efficiency as that of diesel alone. It is found that brake power, engine power and also the engine torque have been improved with the emulsified fuels for 15% of water content in the water diesel emulsion.
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