Orpe, Ashish V. ; Khakhar, D. V. (2004) Solid-fluid transition in a granular shear flow Physical Review Letters, 93 (6). 068001-068004. ISSN 0031-9007
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Official URL: http://prl.aps.org/abstract/PRL/v93/i6/e068001
Related URL: http://dx.doi.org/10.1103/PhysRevLett.93.068001
Abstract
The rheology of a granular shear flow is studied in a quasi-2D rotating cylinder. Measurements are carried out near the midpoint along the length of the surface flowing layer where the flow is steady and nonaccelerating. Streakline photography and image analysis are used to obtain particle velocities and positions. Different particle sizes and rotational speeds are considered. We find a sharp transition in the apparent viscosity (η) variation with rms velocity (u). Below the transition depth we find that the rms velocity decreases with depth and η∝u-1.5 for all the different cases studied. The material approaches an amorphous solidlike state deep in the layer. The velocity distribution is Maxwellian above the transition point and a Poisson velocity distribution is obtained deep in the layer. The results indicate a sharp transition from a fluid to a fluid+solid state with decreasing rms velocity.
Item Type: | Article |
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Source: | Copyright of this article belongs to American Physical Society. |
ID Code: | 17424 |
Deposited On: | 16 Nov 2010 08:39 |
Last Modified: | 17 May 2016 02:03 |
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