Abstract
Ultrasonic-treatment was seemed one of the most favorable treatment methods to be developed in addition to conventional centrifugal equipments for marine diesel fuel oil, so this experimental study was carried to make clear its effects upon physical and chemical properties of some kinds of heavy fuel oil. A special ultrasonic equipment, named K-7, was applied.
Viscosity, surface tension, gravity and specific heat of fuel were measured strictly and gaschromatography tests, spot tests, evaporation and combustion tests of single oil droplet, and engine firing tests were carried before and after the treatment in accordance with many expectant conditions on board.
The most effective result of the treatment is the fact that large floating sludges in oil are crushed and separated into very small particles by its cavitation effect then oil itself becomes so homogeneous.
Evaporation and combustion qualities of single oil droplet become slightly favorable and this affects on engine performance more or less, but other changes for substantial properties of oil as a whole hardly can be expected by the way of the treatment such as we used here.
