Abstract
The fluidity of an emulsified fuel made of water and gas oil was analyzed as a function of water content and lapse of time. As a result, it was found that the emulsified fuel was unstable, mainly due to the coalescence of distributed water droplets in the fuel. The degree of the coalescence is expressed by a newly introduced specific surface area ratio of emulsified fuel : Sp/Se, which has close relationships to the distance between the water droplets. Se is the surface area of emulsified fuel fuel which is assumed to be spherical, and Sp is the sum of the surface areas of distributed water droplets (which are also assumed to be spherical) surface area in the emulsified fuel. The more water content increase, the more the value of Sp/Se increases. The more lapse of time increase, the more the the value of Sp/Se decreases. The relative viscosity of the emulsified fuel is proportional to the value of Sp/Se.
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