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A physical model using as a rheometer to determine the friction parameter of granular flow

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URI: http://hdl.handle.net/2042/57151
Title: A physical model using as a rheometer to determine the friction parameter of granular flow
Author: Pulfer, Gaëtan; Thibert, Emmanuel; Naaim, Mohamed
Abstract: The aim of this work is to develop an inversion method that allowed us to determine the friction parameter that control typical granular flow similar to snow avalanches. Granular flow occur on to plane cover by a rough surface compose of sand paper (typical size is 500µm) and the granular material is compose of glass beads (1.1mm in diameter). In order to control the result obtain by the inversion method, we determine the rheological properties with an external method develop by Pouliquen 1999a. The granular flow is initiated by a break dam of 35mm height and we control the initial volume of beads. The front velocity is measured with an optical device and the position of the front is detected thanks to the colorimetric drop between the rough material (black) and the glass beads (white). On the upper part of the flow we measure the Lagrangian velocity with a Particle Image Velocimetry granular technics of the flow on three different positions using an optical sensor calibrated for glass beads measurements. On the lower part of the front velocity is also measure as same as the way consider on the upper part. Then the shape and the thickness of the deposit is determine with an accurate four fringe shifted Moiré Method.
Subject: granular flow; rheology; friction
Publisher: AFM, Association Française de Mécanique
Date: 2015

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