Force fluctuations at the transition from quasi-static to inertial granular flow.
| cam.issuedOnline | 2019 | |
| cam.orpheus.success | Thu Jan 30 10:37:10 GMT 2020 - Embargo updated | |
| dc.contributor.author | Thomas, AL | |
| dc.contributor.author | Tang, Zhu | |
| dc.contributor.author | Daniels, Karen E | |
| dc.contributor.author | Vriend, NM | |
| dc.contributor.orcid | Thomas, Amalia [0000-0003-2816-1677] | |
| dc.contributor.orcid | Vriend, Nathalie [0000-0002-1456-2317] | |
| dc.date.accessioned | 2019-10-22T23:30:58Z | |
| dc.date.available | 2019-10-22T23:30:58Z | |
| dc.date.issued | 2019-10-30 | |
| dc.description.abstract | We analyse the rheology of gravity-driven, dry granular flows in experiments where individual forces within the flow bulk are measured. We release photoelastic discs at the top of an incline to create a quasi-static erodible bed over which flows a steady 2D avalanche. The flowing layers we produce are dense (φ ≈ 0.8), thin (h ≈ 10d), and in the slow to intermediate flow regime (I = 0.1 to 1). Using particle tracking and photoelastic force measurements we report coarse-grained profiles for packing fraction, velocity, shear rate, inertial number, and stress tensor components. In addition, we define a quantitative measure for the rate of generation of new force chain networks and we observe that fluctuations extend below the boundary between dense flow and quasi-static layers. Finally, we evaluate several existing definitions for granular fluidity, and make comparisons among them and the behaviour of our experimentally-measured stress tensor components. Our measurements of the non-dimensional stress ratio μ show that our experiments lie within the local rheological regime, yet we observe rearrangements of the force network extending into the quasi-static layer where shear rates vanish. This elucidates why non-local rheological models rely on the notion of stress diffusion, and we thus propose non-local effects may in fact be dependent on the local force network fluctuation rate. | |
| dc.format.medium | ||
| dc.identifier.doi | 10.17863/CAM.45067 | |
| dc.identifier.eissn | 1744-6848 | |
| dc.identifier.issn | 1744-683X | |
| dc.identifier.uri | https://www.repository.cam.ac.uk/handle/1810/298011 | |
| dc.language | eng | |
| dc.language.iso | eng | |
| dc.publisher | Royal Society of Chemistry (RSC) | |
| dc.publisher.url | http://dx.doi.org/10.1039/c9sm01111k | |
| dc.rights | All rights reserved | |
| dc.subject | 4012 Fluid Mechanics and Thermal Engineering | |
| dc.subject | 40 Engineering | |
| dc.title | Force fluctuations at the transition from quasi-static to inertial granular flow. | |
| dc.type | Article | |
| dcterms.dateAccepted | 2019-10-13 | |
| prism.endingPage | 8542 | |
| prism.issueIdentifier | 42 | |
| prism.publicationDate | 2019 | |
| prism.publicationName | Soft Matter | |
| prism.startingPage | 8532 | |
| prism.volume | 15 | |
| pubs.funder-project-id | The Royal Society (dh120121) | |
| pubs.funder-project-id | Royal Society (RG130403) | |
| pubs.funder-project-id | International Fine Particle Research Institute (IFPRI) (via North Carolina State University) (2016-0596-01 -) | |
| rioxxterms.licenseref.startdate | 2019-10 | |
| rioxxterms.licenseref.uri | http://www.rioxx.net/licenses/all-rights-reserved | |
| rioxxterms.type | Journal Article/Review | |
| rioxxterms.version | AM | |
| rioxxterms.versionofrecord | 10.1039/c9sm01111k |
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