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Avalanching granular flows down curved and twisted channels: Theoretical and experimental results

Pudasaini, Shiva P. ; Wang, Yongqi ; Sheng, Li-Tsung ; Hsiau, Shu-San ; Hutter, Kolumban ; Katzenbach, Rolf (2008)
Avalanching granular flows down curved and twisted channels: Theoretical and experimental results.
In: Physics of Fluids, 20 (7)
Artikel, Bibliographie

Kurzbeschreibung (Abstract)

Depth evolution and final deposits play a crucial role in the description of the dynamics of granular avalanches. This paper presents new and important results on the geometric deformation and measurements of avalanche depositions in laboratory granular flows and their comparisons with theoretical predictions through some benchmark problems for flows down curved and twisted channels merging into a horizontal plane. XY-table and analoglaser sensor are applied to measure geometries of deposited masses in the fanlike open transition and runout zones for different granular materials, different channel lengths, and different channel mouths in the runout zone. The model equations proposed by Pudasaini and Hutter ``Rapid shear flows of dry granular masses down curved and twisted channels,'' J. Fluid Mech. 495, 193 (2003) are used for theoretical prediction. We show that geometric parameters such as curvature, twist and local details of the channel play a crucial role in the description of avalanching debris and their deposits in the standstill. Asymmetric depositions and surface contours about the central line of the channel could not be produced and predicted by any other classical theories and available experiments in the literature as done in this paper. Such a role played by the geometrical parameters of the channel over physical parameters for the flow of granular materials down a general channel was not investigated before. It is demonstrated that the numerical simulations of the model equations and experimental observations are generally in good agreement.

Typ des Eintrags: Artikel
Erschienen: 2008
Autor(en): Pudasaini, Shiva P. ; Wang, Yongqi ; Sheng, Li-Tsung ; Hsiau, Shu-San ; Hutter, Kolumban ; Katzenbach, Rolf
Art des Eintrags: Bibliographie
Titel: Avalanching granular flows down curved and twisted channels: Theoretical and experimental results
Sprache: Englisch
Publikationsjahr: 2008
Verlag: American Institute of Physics
Titel der Zeitschrift, Zeitung oder Schriftenreihe: Physics of Fluids
Jahrgang/Volume einer Zeitschrift: 20
(Heft-)Nummer: 7
URL / URN: http://pof.aip.org/resource/1/phfle6/v20/i7/p073302s1
Kurzbeschreibung (Abstract):

Depth evolution and final deposits play a crucial role in the description of the dynamics of granular avalanches. This paper presents new and important results on the geometric deformation and measurements of avalanche depositions in laboratory granular flows and their comparisons with theoretical predictions through some benchmark problems for flows down curved and twisted channels merging into a horizontal plane. XY-table and analoglaser sensor are applied to measure geometries of deposited masses in the fanlike open transition and runout zones for different granular materials, different channel lengths, and different channel mouths in the runout zone. The model equations proposed by Pudasaini and Hutter ``Rapid shear flows of dry granular masses down curved and twisted channels,'' J. Fluid Mech. 495, 193 (2003) are used for theoretical prediction. We show that geometric parameters such as curvature, twist and local details of the channel play a crucial role in the description of avalanching debris and their deposits in the standstill. Asymmetric depositions and surface contours about the central line of the channel could not be produced and predicted by any other classical theories and available experiments in the literature as done in this paper. Such a role played by the geometrical parameters of the channel over physical parameters for the flow of granular materials down a general channel was not investigated before. It is demonstrated that the numerical simulations of the model equations and experimental observations are generally in good agreement.

Freie Schlagworte: channel flow; flow simulation; granular flow
Zusätzliche Informationen:

doi:10.1063/1.2945304

Fachbereich(e)/-gebiet(e): 16 Fachbereich Maschinenbau > Fachgebiet für Strömungsdynamik (fdy)
16 Fachbereich Maschinenbau
Hinterlegungsdatum: 24 Aug 2011 18:10
Letzte Änderung: 17 Feb 2014 08:46
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