Heaping instabilities in a layered Bi-disperse granular bed

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题名:	Heaping instabilities in a layered Bi-disperse granular bed
作者:	黎璧賢;Zheng, Ning;Wen, Ping-Ping;Shi, Qing-Fan;Lai, Pik-Yin;Chan, C. K.
贡献者:	理學院物理學系
关键词:	45.70.Qj;47.20.-k;47.54.-r
日期:	2012-11-01
上传时间:	2026-04-23 12:00:49 (UTC+8)
出版者:	EDP Sciences, IOP Publishing and Societ� Italiana di Fisica
摘要:	摘要： Heap formations in a layered bi-disperse granular bed under vertical vibration with strength Γ have been studied experimentally. With the volume ratio (χ) between the two different types of grains and Γ as control parameters, different heap patterns can be created and details of the heap formation can be investigated. In particular, a periodic state in which the heap is being created and destroyed more or less periodically has been realized. This periodic heaping state is found to be related to two instabilities controlled by χ and Γ; namely the instability of a horizontal granular interface and the instability of a heap in a layered granular system. This latter instability would occur only in a layered system. A nonlinear phenomenological model is developed to understand these two instabilities and the predictions of the model are found to be in good agreement with experiments. 其他題名： EPL 出版者： EDP Sciences, IOP Publishing and Società Italiana di Fisica 出版日期： 2012-11-01 出處： Europhysics letters, 2012-11, Vol.100 (4), p.44002 資源來源： IoP Science journals 版權： Copyright © EPLA, 2012 識別號： ISSN: 0295-5075 識別號： EISSN: 1286-4854 識別號： DOI: 10.1209/0295-5075/100/44002 識別號： CODEN: EULEEJ
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