Abstract
The correlation between initial bulk density and flow-patterns were investigated using a model bin. A two-dimensional rectangular bin (10cm×5cm×40cm) was filled with Toyourasand, having a particle size of 105-297μ.
The following results were found from the experiments:
(1) The bulk density leads to the Mass-Flow type when loosely packed, and the funnel-flow type when closely packed
(2) When the Mass-Flow type is transformed into the Funnel-Flow type, there is a linear relationship between the initial void ratio of a model bin and the rate of the flow region, which means the ratio of the width of the main (sub)-flowing region and the width of a model bin.
(3) When the Mass-Flow type is transformed into the Funnel-Flow type, the differnce between the maximum and the minimum bulk density in the vertical direction of the same model has a maximum value.
