|
DRUM >
Theses and Dissertations from UM >
UM Theses and Dissertations >
Please use this identifier to cite or link to this item:
http://hdl.handle.net/1903/4151
|
| Title: | Mechanisms for Axial Band Formation in a Rotating Drum of Granular Material |
| Authors: | Newey, Michael Kent |
| Advisors: | Losert, Wolfgang |
| Department/Program: | Physics |
| Type: | Dissertation |
| Sponsors: | Digital Repository at the University of Maryland
University of Maryland (College Park, Md.) |
| Keywords: | Physics, Fluid and Plasma (0759)
Physics, General (0605)
granular; rotating drum; pattern formation; axial band formation; radial segregation; non-linear |
| Issue Date: | 1-Dec-2006 |
| Abstract: | We study granular particles, like sand or glass beads, that are mixed in a partially filled, horizontal, rotating, cylindrical drum. When particles of different sizes are placed in the drum spatial segregation of the particles by size is observed. This segregation occurs in two phases. During the first phase, called radial segregation, the smaller particles form a radial core. In the second, called axial segregation, particles segregate into alternating bands along the axis of the drum.
We perform a detailed study of the characteristics of the flow to determine the physical mechanisms driving axial segregation. We characterize the top surface of the flowing layer by tracking particles using a high-speed camera. We then extract average quantities such as velocity and diffusion. The average velocities show surprising behavior: Particles in small particle bands have a higher downhill flow velocity than particles in large particle bands. We also observe that there is a pattern of sidewa... |
| URI: | http://hdl.handle.net/1903/4151 |
| Appears in Collections: | Physics Theses and Dissertations
UM Theses and Dissertations
|
Files in This Item:
| File |
Description |
Size | Format | No. of Downloads |
|---|
| umi-umd-3946.pdf | RESTRICTED ACCESS | 6324Kb | Adobe PDF | 64 | View/Open |
|
Show full item record
All items in DRUM are protected by copyright, with all rights reserved.
|
