and it not only cooled the oil surface, it also mixed and enhanced the heat transfer between the hot oil and cold oil below to rapidly reduce the oil temperature near the surface, below its auto-reignition temperature and prevents re-ignition. Watermist has limited effect on water drop splashing and oil splattering compared with water droplet [11]. The experiments demonstrated that the water mist fire suppression systems developed in the present work were capable of extinguishing cooking oil fires and preventing their re-ignition.