Pressure-driven suspension flow near jamming

We report here magnetic resonance imaging measurements performed on suspensions with a bulk solid volume fraction (ϕ_{0}) up to 0.55 flowing in a pipe. We visualize and quantify spatial distributions of ϕ and velocity across the pipe at different axial positions. For dense suspensions (ϕ_{0}>0.5)...

Full description

Saved in:
Bibliographic Details
Published in:Physical review letters 2015-02, Vol.114 (8), p.088301-088301, Article 088301
Main Authors: Oh, Sangwon, Song, Yi-qiao, Garagash, Dmitry I, Lecampion, Brice, Desroches, Jean
Format: Article
Language:English
Subjects:
Accounting
Boundaries
Jamming
Pipe
Rheology
Shear rate
Spatial distribution
Volume fraction
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:We report here magnetic resonance imaging measurements performed on suspensions with a bulk solid volume fraction (ϕ_{0}) up to 0.55 flowing in a pipe. We visualize and quantify spatial distributions of ϕ and velocity across the pipe at different axial positions. For dense suspensions (ϕ_{0}>0.5), we found a different behavior compared to the known cases of lower ϕ_{0}. Our experimental results demonstrate compaction within the jammed region (characterized by a zero macroscopic shear rate) from the jamming limit ϕ_{m}≈0.58 at its outer boundary to the random close packing limit ϕ_{rcp}≈0.64 at the center. Additionally, we show that ϕ and velocity profiles can be fairly well captured by a frictional rheology accounting for both further compaction of jammed regions as well as normal stress differences.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.114.088301