:Simulation of Floating Motion of Seeds in Rising Tube
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概要
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The equations describing seeds motion were introduced, and a bouncing motion model was presented to express the irregular bounce of seeds. The effect of the lift force on the seeds suspension flow involved some factors acting on the seeds was discussed by means of the simulation based on the spherical seed model. Following results were obtained.1. By attaching the loope hose on the around top of the vertical tube, the seeds except smaller seeds than rough rice evolved the reiteration motion of the irregular bounce on the wavy wall. Then the transformation of momentum or energy was producted and the distribution of seeds on a section of the tube approached to a rather uniform dispersion.2. When the inside wall of the upper tube was smooth the velocities of soybeans which were consisted of three component of X, Y and Z increased in a monotony comparing with the velocities before collision. This is due to the influence of an incidence angle introduced by the random variable.3. The top of the tube was closed with a transparent plastic board and the trajectories of cone were pursued. The repetition calculations of 20 to 30 trials of collision were necessary to get convergence of the velocities of each direction, and a constant value of the variation of distribution was indicated.4. For the condition of distribution of seeds, calculated values well agreed with the experimental results. Consequently, it was suggested that the irregular bouncing model could account for the mechanism of seeds suspension in the rising air tube.
- 農業機械学会の論文
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