New method to measure the adhesive shear strength of snow particles using a rotating disk

Osamu ABE

doi:10.5331/seppyo.69.601

回転円盤による雪粒子の剪断付着力の測定法

阿部修

著者情報

キーワード: 雪粒子, 剪断付着力, 測定装置, 回転円盤

ジャーナルフリー

2007 年 69 巻 5 号 p. 601-609

DOI https://doi.org/10.5331/seppyo.69.601

詳細

発行日: 2007/09/15 受付日: 2007/03/12 J-STAGE公開日: 2009/08/07 受理日: 2007/05/28 早期公開日: - 改訂日: -
訂正情報
訂正日: 2009/08/07 訂正理由: - 訂正箇所: 論文抄録訂正内容: Wrong : In this study, a new method to measure the adhesive shear strength between particles of different sizes and a plate using a rotating disk is proposed. This method can be applied to measure the moment adhesive shear strength with which particles remain in contact with the plate for very short periods. The study also describes examples of the measurement of the adhesive shear strength between glass beads (radius: 0.125-1 mm) and an ice plate and between snow particles (radius: 0.21-0.42 mm) and a glass plate at an air temperature of -12.5 to -2.5°C.The values thus obtained are compared with those obtained by different methods. The adhesive shear strength measured by the proposed method exhibits an obvious dependence on size and temperature. The adhesive shear strength just 15 s after a glass bead with a radius of 0.5 mm makes contact with the ice plate at-11.2°C is about 10 times greater than the moment adhesive shear strength at the same temperature and size. In addition, the adhesive shear strength of snow particles with irregular shapes is greater than that of spherical snow particles.
Right : In this study, a new method to measure the adhesive shear strength between particles of different sizes and a plate using a rotating disk is proposed. This method can be applied to measure the moment adhesive shear strength with which particles remain in contact with the plate for very short periods. The study also describes examples of the measurement of the adhesive shear strength between glass beads (radius: 0.125-1 mm) and an ice plate and between snow particles (radius: 0.21-0.42 mm) and a glass plate at an air temperature of -12.5 to -2.5°C.The values thus obtained are compared with those obtained by different methods. The adhesive shear strength measured by the proposed method exhibits an obvious dependence on size and temperature. The adhesive shear strength just 15 s after a glass bead with a radius of 0.5 mm makes contact with the ice plate at-11.2°C is about 10 times greater than the moment adhesive shear strength at the same temperature and size. In addition, the adhesive shear strength of snow particles with irregular shapes is greater than that of spherical snow particles.

訂正日: 2009/08/07 訂正理由: - 訂正箇所: 所属機関情報訂正内容: Wrong :
1) Shinjo Branch, Snow and Ice Research Center, National Research Institute for Earth Science and Disaster Prevention

Right :
1) Shinjo Branch, Snow and Ice Research Center, National Research Institute for Earth Science and Disaster Prevention

抄録

回転円盤上に多数の粒子をばらまき,付着した粒子の遠心力と付着力が等しいという原理を利用して,単体粒子と平盤の間の勇断付着力を測定する方法を考案した.回転中の円盤上に粒子をばらまけば瞬間的な付着力を,また静止した円盤上にばらまきその後回転させれば一定時間経過後の付着力を測定することができる.この方法により,気温-12.5～-2.5℃における,ガラスビーズ(半径0.125～1mm)と氷盤,雪粒子(投影面積相当半径0.21～0.42 mm)とガラス盤の問の勇断付着力を測定した.測定された両者の剪断付着力は,明確な粒径依存性および温度依存性を示した.瞬間的な剪断付着力は,粒径については,粒子が球形の場合は半径の2乗に,不定形の場合は投影面積相当半径/円形度の2乗に比例し,温度については,低温ほど小さな値となった.-11.2℃における付着後15s経過した半径0.5mmのガラスビーズと氷盤の剪断付着力は同じ条件の瞬間的な剪断付着力より1桁大きかった.また,複雑な形状をした雪粒子の剪断付着力は円形のものより大きな値を示した.

責任著者(Corresponding author)

訂正情報

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