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강완봉(Wan-Bong Kang),김덕줄(Duck-Jool Kim) 한국자동차공학회 2000 한국자동차공학회 지부 학술대회 논문집 Vol.- No.-
The liquid atomization is utilized in many fields of industry and engineering, for examples spray drying, spray cooling, spray painting, fuel injection, etching and so on. This study is to investigate the effects of outer air swirler and inner water swirler on atomization of liquid. The experiment was carried out with increasing air-flow rate at constant liquid-flow rate and with<br/> changing outer air swirler angle and inner water swirler angle. The macro characterstics of<br/> liquid spray such as the spray penetration, spray angle and breakup process were captured by PMAS and the micro characteristics of liquid spray such as droplet size and velocity were obtained by PDA. The axial mean velocity and SMD of droplets were measured along the center line and radial directions. It was found that the higher air flow-rate resulted in the smaller Sauter mean diameter of liquid spray and the higher axial mean velocity of droplets. In case of both outer air swirler and inner water swirler SMD was smaller. This experimental results will be conveniently used for the preliminary design stage of twin-fluid nozzle development.