Penetration in bimodal, polydisperse granular material

Handle URI:
http://hdl.handle.net/10754/621920
Title:
Penetration in bimodal, polydisperse granular material
Authors:
Kouraytem, Nadia ( 0000-0002-7183-2774 ) ; Thoroddsen, Sigurdur T. ( 0000-0001-6997-4311 ) ; Marston, J. O.
Abstract:
We investigate the impact penetration of spheres into granular media which are compositions of two discrete size ranges, thus creating a polydisperse bimodal material. We examine the penetration depth as a function of the composition (volume fractions of the respective sizes) and impact speed. Penetration depths were found to vary between delta = 0.5D(0) and delta = 7D(0), which, for mono-modal media only, could be correlated in terms of the total drop height, H = h + delta, as in previous studies, by incorporating correction factors for the packing fraction. Bimodal data can only be collapsed by deriving a critical packing fraction for each mass fraction. The data for the mixed grains exhibit a surprising lubricating effect, which was most significant when the finest grains [d(s) similar to O(30) mu m] were added to the larger particles [d(l) similar to O(200 - 500) mu m], with a size ratio, epsilon = d(l)/d(s), larger than 3 and mass fractions over 25%, despite the increased packing fraction. We postulate that the small grains get between the large grains and reduce their intergrain friction, only when their mass fraction is sufficiently large to prevent them from simply rattling in the voids between the large particles. This is supported by our experimental observations of the largest lubrication effect produced by adding small glass beads to a bed of large sand particles with rough surfaces.
KAUST Department:
Physical Sciences and Engineering (PSE) Division
Citation:
Kouraytem N, Thoroddsen ST, Marston JO (2016) Penetration in bimodal, polydisperse granular material. Physical Review E 94. Available: http://dx.doi.org/10.1103/PhysRevE.94.052902.
Publisher:
American Physical Society (APS)
Journal:
Physical Review E
KAUST Grant Number:
FCC/1/1975
Issue Date:
7-Nov-2016
DOI:
10.1103/PhysRevE.94.052902
Type:
Article
ISSN:
2470-0045; 2470-0053
Sponsors:
The research described herein was partially funded by KAUST. We acknowledge the financial support from CCRC at KAUST, Extreme Combustion FCC/1/1975.
Additional Links:
http://journals.aps.org/pre/abstract/10.1103/PhysRevE.94.052902
Appears in Collections:
Articles; Physical Sciences and Engineering (PSE) Division

Full metadata record

DC FieldValue Language
dc.contributor.authorKouraytem, Nadiaen
dc.contributor.authorThoroddsen, Sigurdur T.en
dc.contributor.authorMarston, J. O.en
dc.date.accessioned2016-12-01T14:12:43Z-
dc.date.available2016-12-01T14:12:43Z-
dc.date.issued2016-11-07en
dc.identifier.citationKouraytem N, Thoroddsen ST, Marston JO (2016) Penetration in bimodal, polydisperse granular material. Physical Review E 94. Available: http://dx.doi.org/10.1103/PhysRevE.94.052902.en
dc.identifier.issn2470-0045en
dc.identifier.issn2470-0053en
dc.identifier.doi10.1103/PhysRevE.94.052902en
dc.identifier.urihttp://hdl.handle.net/10754/621920-
dc.description.abstractWe investigate the impact penetration of spheres into granular media which are compositions of two discrete size ranges, thus creating a polydisperse bimodal material. We examine the penetration depth as a function of the composition (volume fractions of the respective sizes) and impact speed. Penetration depths were found to vary between delta = 0.5D(0) and delta = 7D(0), which, for mono-modal media only, could be correlated in terms of the total drop height, H = h + delta, as in previous studies, by incorporating correction factors for the packing fraction. Bimodal data can only be collapsed by deriving a critical packing fraction for each mass fraction. The data for the mixed grains exhibit a surprising lubricating effect, which was most significant when the finest grains [d(s) similar to O(30) mu m] were added to the larger particles [d(l) similar to O(200 - 500) mu m], with a size ratio, epsilon = d(l)/d(s), larger than 3 and mass fractions over 25%, despite the increased packing fraction. We postulate that the small grains get between the large grains and reduce their intergrain friction, only when their mass fraction is sufficiently large to prevent them from simply rattling in the voids between the large particles. This is supported by our experimental observations of the largest lubrication effect produced by adding small glass beads to a bed of large sand particles with rough surfaces.en
dc.description.sponsorshipThe research described herein was partially funded by KAUST. We acknowledge the financial support from CCRC at KAUST, Extreme Combustion FCC/1/1975.en
dc.publisherAmerican Physical Society (APS)en
dc.relation.urlhttp://journals.aps.org/pre/abstract/10.1103/PhysRevE.94.052902en
dc.rightsArchived with thanks to Physical Review Een
dc.titlePenetration in bimodal, polydisperse granular materialen
dc.typeArticleen
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.identifier.journalPhysical Review Een
dc.eprint.versionPublisher's Version/PDFen
dc.contributor.institutionDepartment of Chemical Engineering, Texas Tech University, Lubbock, TX, United Statesen
kaust.authorKouraytem, Nadiaen
kaust.authorThoroddsen, Sigurdur T.en
kaust.grant.numberFCC/1/1975en
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