安息角の測定値に及ぼす実験条件の影響(注入角法の場合)
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概要
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In this experiment, the effects of apparatus factors, such as the base ring diameter, pouring rate, etc.on the angle of repose φ_r of the poured powder have been studied. By using the apparent fraction of the void ε^※ of the poured powder and its adhesion property, the authors have tried to explain the dependency of φ_r on the apparatus factors. In this case, the apparatus factors for the angle of repose of the poured are as follows : (1) The base ring diameter D_r (mm) (2) The pouring rate Q (g/min) (3) The spatter height H_3 (mm) (4) The base ring height h_r (mm) Magnesium hydroxide, garnet, talc, artificial stone (white marble), glass bead, lycopodium were used as sample powder. The results obtained are summarized as follows : (1) As D_r increases, φ_r of all sample powder decreases, but ε^※ of lycopodium, garnet, and magnesium hydroxide is constant. (2) As Q increases, φ_r and ε^※ of all sample powder decrease. (3) As H_s increases, φ_r of magnesium hydroxide and artificial atone increases, and φ_r of lycopodium decreases, but ε^※ of all these powder decreases. (4) As h_r increases, in the case of the artificial stone, φ_r and ε^※ take the maximum value and then they decrease again. For the dependency of φ_r on these apparatus factors, the following are matters of great importance. (1) Packing of the poured powder by its own weight. (2) Break down of the top of the heap of the poured powder by falling powder. (3) The pile up effect on the top of the heap of the poured powder by its adhesion property. (4) In fine powders their coagulated secondary particles moved as flowing units through the spatter, but, in the case of the large H_s, these coagulated particles were broken into primary particles during the falling.
- 1969-06-15