Particle Motion Behavior in Coaxial Opposed Jets
Opposed jets provide a novel configuration for drying and/or chemical reactions of particles which can be dispersed in a flowing gas stream. In this paper, an experimental investigation of the motion of particle in coaxial opposed jets was performed. The parameters of the particles such as trajectories, velocities, maximum penetration distances and rotational speeds in opposed jets were obtained by investigating the pictures photographed by a high-speed camera. The effects of exit air velocity, particle diameter and exit particle velocity on particle motion behavior were researched. Results show that, there are two models for particle motion behavior in turbulence opposed jets, i.e., direct escape model and oscillation model. Particles with oscillate model are about 80% of the total. The initial loaction and veloctiy of the particle have great influence on particle motion. With the increase of exit air velocity,the rotational speed increases. At fixed exit air velocity, with the increase of normalized exit particle velocity Up0, the maximum penetration distance increase. The maximum penetration distance increases with the Stokes number of the particle and normalized nozzle separations L/D (where L is the nozzle separation and D is the nozzle diameter) increasing. The Magnus force resulting from particle rotation which is hundreds of circles per second cant be negligible.
particle motion opposed jets high-speed camera Magnus force
SUN Zhi-gang LI Wei-feng Wang Yi-fei LIU Hai-feng YU Zun-hong
Coal Gasification Key Laboratory of the Ministry of Education, East China University of Science and Technology, Shanghai 200237, China
国际会议
The 12th Asian Pacific Confederation of Chemical Engineering Congress(第十二届亚太化工联盟大会暨化工展览会)
大连
英文
2008-08-04（万方平台首次上网日期，不代表论文的发表时间）