Palm oil is usually used for cooking. The usage of this oil is frequently associated with health issues, especially if it consumed repeatedly. In fact, waste cooking oil (WCO) can be used as fuel and safe for the environment. The aim of this research is to know the characteristics of the droplets size. WCO is given preheating and pressure treatment before a simple nozzle exits. The experiment begins by inserting WCO into a tube through the intake. Air compressor is inserted into the tube and

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... ssure level is maintained at 3 bar. The valve is opened slowly so that WCO flows through the pipe line to the spiral pre-heater. Pre-heater temperature is varied at 350, 360, 370, 380 and 390 o C. Afterwards, WCO flows into the main body of nozzle. Spray particle of WCO on the nozzle are captured using the camera. The same experiment was repeated using pressure at 4 and 5 bar. Result of droplet size was obtained by fluctuation at pressure 3 and 4 bar. When pressure was raised 5 bar, the droplets size decreases.