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A STUDY OF THREE-PHASE FRACTURING IN GRANULAR MEDIA USING HIGH-SPEED IMAGING / Deren Ozturk, Bjornar Sandnes

Journal of Porous Media, Volume: 22, Issue: 8, Pages: 987 - 1000

Swansea University Authors: Deren Ozturk, Bjornar Sandnes

Abstract

Using high-speed imaging and digital image correlation, we studied the granular motion and deformation caused by pneumatic fracturing of a wet granular packing in a Hele–Shaw cell subject to a constant injection of air. These pneumatic fractures form patterns of conductive pathways whose form is det...

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Published in: Journal of Porous Media
ISSN: 1091-028X
Published: Begell House 2019
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa52472
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Abstract: Using high-speed imaging and digital image correlation, we studied the granular motion and deformation caused by pneumatic fracturing of a wet granular packing in a Hele–Shaw cell subject to a constant injection of air. These pneumatic fractures form patterns of conductive pathways whose form is determined by a complex interplay between pressure, capillary, frictional, and viscous forces. Saturated granular media is pneumatically fractured in this fashion in multiple natural, geo-engineering, and industrial processes. We outline the characteristics of these fracture networks and then examine individual fracture growth events and the local motion of grains with a time resolution of milliseconds. We observe intermittent frictional behavior during these rapid fracturing events, describe an average velocity profile for the motion of grains during fracturing, and illustrate an average compaction profile as a result of these deformations.
Keywords: granular media, fracturing, porous media, capillary forces, friction, multiphase flow, highspeed imaging, particle image velocimetry, Hele-Shaw cell, compaction front
College: College of Engineering
Issue: 8
Start Page: 987
End Page: 1000