水平管内気流中の単一球の運動について

概要

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The present study was carried to produce some basic data for the numerical investigation of pneumatic convection of solid particles. In the equation of motion for a spinning sphere, a force F^^⇾_v due to the velocity gradient of air flow through pipe was newly proposed, in addition to the forces of gravitation, drag, and lift. The force F^^⇾_v acts so as to move the sphere to the pipe center line. In the preliminary experiment, the drag coefficient C_d of the test sphere, whose diameter was 3mm, rebound coefficient e and friction coefficient μ_d for collision between the sphere and pipe wall were measured. Their values were substituted into the corresponding terms of the equation of motion. The equation of motion was numerically solved by use of the Runge-Kutta-Gill method. The values of lift coefficient C_L and coefficient G_s for F^^⇾_v were decided by making comparison between the computed and the experimental results of the trajectory of sphere. As a result, C_d=0.6, C_S=0.1, C_L=(1.6-2.0) d_pω/| W^^⇾'| and μ_d=0.12-0.20 were obtained for Reynolds number R_<e,p>=2000-6000.
一般社団法人日本機械学会の論文
1985-11-25