A study on gasoil-water (water/oil type) emulsified fuel. The effects of lapse of time on the spray characteristics.

Abstract

In the previous report, the fluidity (viscosity) of emulsified fuel was shown as a function of water content and lapse of time. Therefore, The spray characteristics of emulsified fuel are also functions of water content and lapse of time. The experiments indicated that the more water content increase, the more the sauter mean diameter of emulsified fuel increases, and the more the lapse of time increases, the more the sauter diameter of emulsified fuel decreases. This tendency is expressed by the newly introduced specific surface area ratio of emulsified fuel : Sp/Se, which is in close relationship to the distance between the water droplets in the fuel. Se is the surface area of an emulsified fuel droplet which is assumed to be spherical and Se is the sum of surface areas of distributed water droplets in the fuel (which are also assumed to be spherical). The more water content increases, the more the value of Tp/Se increases. The more the lapse of time increases, the value of Sp/Se decreases. Then the relative viscosity of the fuel is proportional to the value of Sp/Se. Therefore, the increased Sp/Se Produced the increased mean sauter diameter of the emulsified fuel.