Please use this identifier to cite or link to this item:
|Title:||On the density waves developed in gravity channel flows of granular materials|
|Authors:||Wang, C.-H. |
|Source:||Wang, C.-H.,Tong, Z. (2001-05-25). On the density waves developed in gravity channel flows of granular materials. Journal of Fluid Mechanics 435 : 217-246. ScholarBank@NUS Repository. https://doi.org/10.1017/S0022112001003792|
|Abstract:||This paper provides insight to the transient development of density waves generated in gravity-driven flows of granular materials. The evolution of three modes of dominant linear instabilities (predicted in a previous work by Wang, Jackson & Sundaresan 1997) is examined by FFT analysis. For the first symmetric density wave (SDW1) mode, the evolution is governed by the linear instability. The second symmetric density wave (SDW2) mode undergoes a few stages of temporal development; as a result, large particle clusters gradually degenerate into a series of smaller clusters in the flow direction. For the anti-symmetric (ASDW) mode, the corresponding particle distribution shows significant development in the direction perpendicular to the flow. The present study indicates that the wall roughness may affect the structure of the density waves, but these density waves need not be triggered by the wall roughness. All the three modes of instabilities reported in this work are of inertial nature and occur only when the particle-particle collisions are significantly inelastic.|
|Source Title:||Journal of Fluid Mechanics|
|Appears in Collections:||Staff Publications|
Show full item record
Files in This Item:
There are no files associated with this item.
checked on Dec 12, 2017
checked on Dec 15, 2017
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.