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Spray is widely used in the development of nanotechnology, both in the automotive and the industrial sector. The perfect mist is one of which is determined by droplet formation. Therefore, it is necessary to research the droplet formation characteristics of the fluid. Research begins by observing the trend of spray trajectories of diesel fuel with pressure variation. The effects of increased pressure produce a thick trajectory, filled with shadows. This shows that the liquid sprayed has largely been turned into a droplet. The next is observation of droplet formation characteristics. The study was conducted by observing the dripping process of a droplet from a disposable syringe with needle. Variety of fluids used diesel fuel, emulsion and pure water. Observation of the experiment The distance of the syringe, the diameter droplet that is formed and stretch from each droplet before dropping. The data analysis shows that diesel fuel has the greatest distance, the largest diameter and the longest stretch. While emulsion fuel has droplet formation with the smallest diameter droplet size and more solid so the stretch is the least, and the displacement is shorter than diesel fuel. While pure water has the shortest travel distance. This indicates that flocculation occurs due to the water phase being dispersed into the oil phase. Therefore, the composition should be considered to reduce the formation of inner phases that increase the viscosity of the emulsion. Keywords—spray; drople; diesel fuel; emulsion; pure water.

Characteristics of Droplet Formation Between Diesel Fuel, Emulsion and Pure Water