Study on Application of Vibratory Motion to Conveying Granular Materials -Effect of vibration on movability of granular materials-

To study the vibration effect on the movement of particles, two kinds of experiments with the tilted board and the wind tunnel were carried out. The friction coefficients calculated from the transfer threshold conditions were smaller than those from the critical friction velocities. The friction coefficients decreased linearly with the increase in acceleration ratio of the vibration. Under vibrating conditions, the dimensionless critical tractive force had its minimum value at a certain Reynolds number. The vibration effect on particles in the air flow had its maximum value at a certain ratio of the particle diameter to the laminar sublayer. Suitable conditions for conveying granular materials under vibrating conditions were clarified fundamentally by this study.