title: Laser filamentation induced air-flow motion in a diffusion cloud chamber.
abstract: We numerically simulated the air-flow motion in a diffusion cloud chamber induced by femtosecond laser filaments for different chopping rates. A two dimensional model was employed, where the laser filaments were treated as a heat flux source. The simulated patterns of flow fields and maximum velocity of updraft compare well with the experimental results for the chopping rates of 1, 5, 15 and 150 Hz. A quantitative inconsistency appears between simulated and experimental maximum velocity of updraft for 1 kHz repetition rate although a similar pattern of flow field is obtained, and the possible reasons were analyzed. Based on the present simulated results, the experimental observation of more water condensation/snow at higher chopping rate can be explained. These results indicate that the specific way of laser filament heating plays a significant role in the laser-induced motion of air flow, and at the same time, our previous conclusion of air flow having an important effect on water condensation/snow is confirmed.
authors.affiliation: State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, P.O. Box 800-211, Shanghai 201800, China.
authors.forename: Haiyi
authors.initials: H
authors.lastname: Sun
authors.forename: Jiansheng
authors.initials: J
authors.lastname: Liu
authors.forename: Cheng
authors.initials: C
authors.lastname: Wang
authors.forename: Jingjing
authors.initials: J
authors.lastname: Ju
authors.forename: Zhanxin
authors.initials: Z
authors.lastname: Wang
authors.forename: Wentao
authors.initials: W
authors.lastname: Wang
authors.forename: Xiaochun
authors.initials: X
authors.lastname: Ge
authors.forename: Chuang
authors.initials: C
authors.lastname: Li
authors.forename: See Leang
authors.initials: SL
authors.lastname: Chin
authors.forename: Ruxin
authors.initials: R
authors.lastname: Li
authors.forename: Zhizhan
authors.initials: Z
authors.lastname: Xu
mesh_terms: D003198:Computer Simulation; D005740:Gases / Q000737:chemistry* / Q000528:radiation effects*; D006361:Heating / Q000379:methods; D007834:Lasers; D008956:Models, Chemical; D012212:Rheology / Q000379:methods*; D012542:Scattering, Radiation
chemical_list: D005740:Gases