Flow characteristics of granular rods subjected to radial shear at varying angular frequencies

Date

4-2014

Degree

Bachelor of Science in Applied Physics

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Lou Serafin M. Lozada

Abstract

We studied how the velocity profile and height of the granular rod system changein a Couette shear cell at different angular frequencies of the inner cylinder. Wemeasured the static and kinetic coefficients of friction in both rod-rod interface andwall-rod interface, and observed the measurements for rod-rod interface higher thanthe wall-rod interface. It was observed that the rotation of the inner cylinder createsa shear band over a distance of about 5 rod diameters. Rods gain momentum due tointeraction with the moving inner cylinder and moving neighboring rods. However,due to friction and inelastic collision, energy is dissipated. The average speed ofrods decreases exponentially as the distance from the inner wall increases. It wasobserved that rods align upon collision with other rods. This causes the rods tooccupy smaller spaces resulting to rod compression, which displays a lowering inpacking height. This phenomenon was observed within the shear band. PACS: 83.10.Bb [Kinematics of deformation and flow], 83.10. [Continuum mechanics],83.10.Gr [Constitutive relations], 83.10.Pp [Particle dynamics], 83.50.Ax [Steadyshear flows, viscometric flow], 83.60.Fg [Shear-rate dependent viscosity], 83.60.Rs[Shear rate dependent structure], 83.80.Fg [Granular solids]

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

LG 993.5 2014 P51 /G63

Document Type

Thesis

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