The influence of geometry parameters on granular oscillation
Date Issued
2012
Date
2012
Author(s)
Jan, Hsen-Hao
Abstract
This article explores the granular gases in the compartmentalized systems. We try to change the geometry parameters of asymmetric container (width ratio, height ratio, and angle of bottom) in order to study the phenomenon of granular gases.
We found two different granular oscillation in each asymmetric container. The phase diagram of granular number has two oscillating areas. They are GO1&GO2 in asymmetric width container, GOM&GOS in asymmetric height container and GOI&GOO in asymmetric slope bottom container. In GO1 state, the granular gases spend longer time moving from the wider compartment to the narrower compartment; However, GO1 and GO2 are the opposite. In addition, GOI & GOO share the same trend with GO1 & GO2, but GOM and GOS are not. .
And then, we focus on the granular oscillation. We count the τRL and τLR, and use the high-speed camera to record the movement of particles in the granular oscillation. (τRL -τLR ) are increases when the geometry parameter of asymmetric container is enlarged in GO1, GO2, GOM and GOS state. GOI’s and GOO’s τ are dependent on granular proportion.
Finally, we combine the parameters of width ratio and height ratio to get the equivalent curves between the two parameters. The curves is the boundary of the two trend of τ: (1) The granular gases spend longer time moving from the higher compartment to the lower compartment. (2) The granular gases spend longer time moving from the lower compartment to the higher compartment.
Subjects
bidisperse granular gases
two-compartmentalized container
granular oscillation
asymmetric
Type
thesis
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