Journal of Shanghai University(Natural Science Edition) ›› 2019, Vol. 25 ›› Issue (5): 754-766.doi: 10.12066/j.issn.1007-2861.1954

• Research Paper • Previous Articles     Next Articles

Laser-induced aggregation of Rayleigh granular jets

Zhenyu NIU1,2, Zhewei ZHOU1,2, Kai HUANG1,2, Jinsong ZHANG3,4, Jianhua ZHANG3,4, Zhiliang WANG1,2()   

  1. 1. Shanghai Institute of Applied Mathematics and Mechanics, Shanghai University, Shanghai 200072, China
    2. Key Laboratory of Mechanics in Energy Engineering, Shanghai University, Shanghai 200072, China
    3. School of Mechatronic Engineering and Automation, Shanghai University, Shanghai 200444, China
    4. Key Laboratory of Advanced Display and System Applications of Ministry of Education, Shanghai University, Shanghai 200444,China
  • Received:2017-05-22 Online:2019-10-30 Published:2019-10-31
  • Contact: Zhiliang WANG E-mail:wng_zh@shu.edu.cn

Abstract:

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.

Key words: optical tweezers, Rayleigh particle, granular jets, granular kinetics, flow-stability

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