Dynamical Behavior of Granular Materials flowing Down through a Vessel : Part 1, Interpretation of the Experimental Results

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  • 容器内を流下する粒体の運動 : 第1報, 実験結果の定性的解訳
  • ヨウキ ナイ オ リュウカ スル リュウタイ ノ ウンドウ 1

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Abstract

The two dimensional motion of granular particles flowing out from a vessel through a small slit is analyzed. After the several experiments, we were able to recognize the following facts : (i) It could be possible to say that we can recognize qualitatively the dynamical state of the materials by the aid of a so-called "moving state diagram". (ii) Granular layers can be divided into two parts; the one depends largely on the form of the opening at the bottom and the other depends rather on the intrinsic properties of the material itself. (iii) Average quantity of outflow varies with the width of the opening. (iv) In non-stationary (without charge of material during the operation) and in stationary cases (with continuous feeding of materials compensating for the lost quantity), the dynamical state of the particle in the vessel remains in the so-called "stationary state" and for a short interval at the beginning of the experiment it becomes a real non-stationary (transient) state.

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