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  Role of contact-angle hysteresis for fluid transport in wet granular matter

Mani, R., Semprebon, C., Kadau, D., Herrmann, H. J., Brinkmann, M., & Herminghaus, S. (2015). Role of contact-angle hysteresis for fluid transport in wet granular matter. Physical Review E, 91(4): 042204. doi:10.1103/PhysRevE.91.042204.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0029-5F12-D Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002A-C28A-F
Genre: Journal Article

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 Creators:
Mani, Roman, Author
Semprebon, Ciro1, Author              
Kadau, Dirk, Author
Herrmann, Hans J., Author
Brinkmann, Martin1, Author              
Herminghaus, Stephan2, Author              
Affiliations:
1Group Theory of wet random assemblies, Department of Dynamics of Complex Fluids, Max Planck Institute for Dynamics and Self-Organization, Max Planck Society, ou_2063303              
2Group Granular matter and irreversibility, Department of Dynamics of Complex Fluids, Max Planck Institute for Dynamics and Self-Organization, Max Planck Society, ou_2063306              

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 Abstract: The stability of sand castles is determined by the structure of wet granulates. Experimental data on the size distribution of fluid pockets are ambiguous with regard to their origin. We discovered that contact-angle hysteresis plays a fundamental role in the equilibrium distribution of bridge volumes, and not geometrical disorder as commonly conjectured. This has substantial consequences on the mechanical properties of wet granular beds, including a history-dependent rheology and lowered strength. Our findings are obtained using a model in which the Laplace pressures, bridge volumes, and contact angles are dynamical variables associated with the contact points. While accounting for contact line pinning, we track the temporal evolution of each bridge. We observe a crossover to a power-law decay of the variance of capillary pressures at late times and a saturation of the variance of bridge volumes to a finite value connected to contact line pinning. Large-scale simulations of liquid transport in the bridge network reveal that the equilibration dynamics at early times is well described by a mean-field model. The spread of final bridge volumes can be directly related to the magnitude of contact-angle hysteresis.

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Language(s): eng - English
 Dates: 2015-04-302015-04
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1103/PhysRevE.91.042204
BibTex Citekey: mani-pre-2015
 Degree: -

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Title: Physical Review E
Source Genre: Journal
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Publ. Info: Melville, NY : American Physical Society
Pages: 10 Volume / Issue: 91 (4) Sequence Number: 042204 Start / End Page: - Identifier: ISSN: 1539-3755