摘要
基于breakup和collision液滴破碎模型采用Fluent和Gambit软件对平口喷嘴的真空射流雾化进行了模拟,研究了环境压力、喷射压力和喷嘴直径等参数对射流雾化结构和液滴索特平均直径(Sauter mean diameter,SMD)的影响。结果表明:①随着环境压力的降低,喷射束宽度减小,射流贯穿距离和SMD增加。当环境压力小于0.01 MPa时,各雾化性能参数的变化幅度减小;②环境压力和喷嘴直径一定,随着喷射压力的增加,喷射束宽度呈先快速后缓慢增加的趋势,而射流贯穿距离近似线性增加,SMD值变化不明显;③喷嘴直径越小,喷射束宽度和射流贯穿距离越大,SMD值越小,射流雾化效果越好,更易制备出光滑致密的聚合物薄膜。
The vacuum jet atomization of a plain-orifice nozzle was simulated with software packages Fluent and Gambit,based on the breakup and collision droplet breakup model.The influence of the atomization conditions,including the pressure,injection pressure,and nozzle diameter,on the distributions of the atomized material and Sauter mean diameter（SMD）was evaluated.The simulated results show that：i）At a given injection pressure and a nozzle diameter,as the pressure decreases,the spray beam width decreases,while both the jet penetration distance and SMD increase;however,at a pressure lower than 0.01 MPa,these three factors basically remain unchanged;ii） At a fixed pressure and a nozzle diameter,as the injection pressure increases,first（1～10 Pa）,the spray beam width rapidly increases,and then（above10 Pa）gradually levels off,accompanied by a linear increase of the penetration distance and a fairly constant SMD;iii） A smaller nozzle diameter results in a longer jet penetration distance,wider beam width,smaller SMD,and better atomization.
出处
《真空科学与技术学报》
EI
CAS
CSCD
北大核心
2013年第3期284-288,共5页
Chinese Journal of Vacuum Science and Technology
基金
中央高校基本科研业务费专项资金项目(N110403001)
关键词
平口喷嘴
雾化
聚合物薄膜
真空喷射沉积
Plain-orifice nozzle
Atomization
Polymer thin films
Vacuum spray deposition
