光聚Rayleigh粒子射流  

Laser-induced aggregation of Rayleigh granular jets

作　　者：牛振宇 周哲玮[1,2] 黄凯[1,2] 张金松[3,4] 张建华[3,4] 王志亮[1,2] NIU Zhenyu;ZHOU Zhewei;HUANG Kai;ZHANG Jinsong;ZHANG Jianhua;WANG Zhiliang(Shanghai Institute of Applied Mathematics and Mechanics,Shanghai University,Shanghai 200072,China;Key Laboratory of Mechanics in Energy Engineering,Shanghai University,Shanghai 200072,China;School of Mechatronic Engineering and Automation,Shanghai University,Shanghai 200444,China;Key Laboratory of Advanced Display and System Applications of Ministry of Education,Shanghai University,Shanghai 200444,China)

机构地区：[1]上海大学上海市应用数学和力学研究所,上海200072 [2]上海大学上海市力学在能源工程中的应用重点实验室,上海200072 [3]上海大学机电工程与自动化学院,上海200444 [4]上海大学新型显示技术及应用集成教育部重点实验室,上海200444

出　　处：《上海大学学报（自然科学版）》2019年第5期754-766,共13页Journal of Shanghai University:Natural Science Edition

基　　金：国家自然科学基金资助项目(11172163,11372175);上海市教委e-研究院建设计划项目;上海市高校创新团队建设项目;上海市重点学科建设资助项目(S30106)

摘　　要：对激光作用下Rayleigh粒子射流的动态汇聚和流动稳定性进行了研究.激光技术在微纳尺度微粒操作方面应用广泛,如光镊.而激光对颗粒群体作用的研究则主要集中在对颗粒群体行为特征的光学映射和测量,对激光影响颗粒群体动力学行为的研究还比较鲜见.基于颗粒动力学模拟及流动稳定性理论分析,考察了稀薄射流(点源)与颗粒射流2种情况.对于点源模拟,通过与经典真空蒸镀沉积理论对比发现,激光对于稀薄颗粒气体的运动确实进行了有效的诱导,使得颗粒在空间的分布更为集中;对于纳米颗粒射流,模拟和理论分析同时表明,光场力会抑制颗粒射流界面长波与短波的失稳,具有广谱致稳特征,可以有效地对颗粒射流进行收束.Dynamic convergence and stability characteristics of Rayleigh particle jets under laser irradiation are studied. Laser technology has widely applications in particle operation at micro-nano scales such as optical tweezers. While researches of particle behavior under laser irradiation generally focus on optical mapping and measurement of the particle population characteristics, laser-induced particle dynamical behaviors are rarely studied. Based on the analysis of granular gas dynamic simulation and the flow instability theory, the two cases of rarefied granular jet (point source) and granular jet are investigated. For point sources, that laser is effective in making the particle distribution more concentrated in the space by comparing with the classical vacuum deposition theory is found. In the case of granular jet, simulation and theoretical analysis show that the light scattering force can suppress instability of the long and short wavelengths, and effectively gather nanoparticles into jet.

关 键 词：光镊 Rayleigh粒子 颗粒射流 颗粒动力学 流动稳定性 

分 类 号：O358[理学—流体力学]