## Abstract

Most previous experimental investigations of two-dimensional (2D) granular column collapses have been conducted using three-dimensional (3D) granular materials in narrow horizontal channels (i.e., quasi-2D condition). Our recent research on 2D granular column collapses by using 2D granular materials (i.e., aluminum rods) has revealed results that dier markedly from those reported in the literature. We assume a 2D column with an initial height of

of

(

granular column under true 2D conditions is investigated.

*h*_{0}and initial widthof

*d*_{0}, a dened as their ratio (a=*h*), a final height of h_{0}/d_{0}_{∞}, and maximum run-out distance of d_{∞}. The experimental data suggest that for the low a regime (a0.65) the ratio of the final height to initial height is 1. However, for the high*a*regime (a≥0.65), the ratio of*a*to (*d*_{∞}*-d*_{0})*/d*is expressed by power-law relations. In particular, the following power-function ratios (_{0}, h_{0}/h_{∞}, or d_{∞}/d_{0}*h*≈1.42a_{0}/h_{∞ }^{2/3}and*d*_{∞}/*d*_{0 }∼ 4.30a^{0.72}) are proposed for every*a*≥0.65. In contrast, the ratio(

*d*_{∞}*-d*_{0})/*d*≥3.25_{0}*a*^{0.96}only holds for 0.65≤a≤1.5, whereas the ratio (*d*_{∞}*-d*_{0})/d_{0}≈ 3.80*a*^{0.73}holds for*a*≥1.5. In addition,the influence of ground contact surfaces (hard or soft beds) on the final run-out distance and destruction zone of thegranular column under true 2D conditions is investigated.

Original language | English |
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Pages (from-to) | 395 - 402 |

Number of pages | 8 |

Journal | Journal of Chemical Engineering of Japan |

Volume | 48 |

Issue number | 6 |

DOIs | |

Publication status | Published - 2015 |