3D avalanching of rod-like granular materials Aspect ratio versus angle of repose By Walter Hopkins...
-
date post
19-Dec-2015 -
Category
Documents
-
view
214 -
download
0
Transcript of 3D avalanching of rod-like granular materials Aspect ratio versus angle of repose By Walter Hopkins...
3D avalanching of rod-like granular materials
Aspect ratio versus angle of repose
By Walter Hopkins
Ken Desmond
Jess Gallagher
Scott Barker
Motivation
• Application with mixing polymers
• Oil Industry
• Transition between solid body behavior and granular behavior?
Set up of Experiment
• There are four rollers guiding the cell
• Camera mounted to take video through cell center
• Cell rotates slowly
• Belt driven on the non transparent side of the cell
• Acrylic cell and rods
• Quasi static
Rods
We will be looking at the behavior of the following prolate granular materials:
• Acrylic rods with aspect ratios from 8 to 40
• Rice grains
The acrylic rods will have diameters ranging between 1/16” and ¼”
The cell
• Different diameter cells will be used
• No variable cell material
• Variable end cap.
• Non transparent end of cell driven by motor
Acquiring Data
• One camera mounted at the center of the rotating drum
• Might try to do particle tracking by coloring and additional camera
• The video data is used to determine the different states of avalanche
Analyzing Data
• Averaging the images will give us the angle of repose
• Subtracting the images shows us which particles are moving
• Programs are written in IDL