Abstract
The experiments were carried out to investigate qualitatively the effects of emulsion internal phase structure such as the size distribution of water droplets on the micro-explosion phenomena of water-in-'A' heavy oil emulsified droplets vaporizing on the hot surface. The results confirm that the size distribution of water droplets in the emulsified fuels plays a very important role in the boiling phenomena, in spite of the same water content included in the fuels. That is, Emulsified fuel 1 with fine- and uniform-size distribution of the internal water droplets has a longer life time than the neat fuel ('A' heavy oil) on account of a distinctive feature such as 'two stage vaporization'. In contrast, Emulsified fuel 2 with some coarse sizes of them has a life time less than a half of vaporization was caused by the destruction of the vapor film due to the 'violent micro explosion' of coarse-coalescent water droplets.
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