Abstract
Water in diesel emulsions are known to have superior combustion properties. A critical factor that determines their applicability as a fuel is their stability. In this work we propose a novel method for continuous on-board generation of stable water in oil emulsions that is best suited for direct application in internal combustion engines. Here superheated steam is generated and is brought in contact with the oil phase containing surfactant in a helically coiled tube. The steam continuously condenses resulting in micron size droplets in the oil phase. Controlled experiments were done with dodecane as the organic phase containing a surfactant. The droplets size of the dispersed phase is found to be in the range of 1–12 µm. The emulsions obtained were found to be stable for at least 15 days. The mean droplet size is determined as a function of water volume percentage, surfactant concentration and emulsion flow rate. The droplet size features obtained when diesel is used as the continuous phase is found to be similar to that obtained using dodecane.
Published Version
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