Universität zu Köln

Fan, Fengxian, Parteli, Eric J. R. and Poeschel, Thorsten (2017). Origin of Granular Capillarity Revealed by Particle-Based Simulations. Phys. Rev. Lett., 118 (21). COLLEGE PK: AMER PHYSICAL SOC. ISSN 1079-7114

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Abstract

When a thin tube is dipped into water, the water will ascend to a certain height, against the action of gravity. While this effect, termed capillarity, is well known, recent experiments have shown that agitated granular matter reveals a similar behavior. Namely, when a vertical tube is inserted into a container filled with granular material and is then set into vertical vibration, the particles rise up along the tube. In the present Letter, we investigate the effect of granular capillarity by means of numerical simulations and show that the effect is caused by convection of the granular material in the container. Moreover, we identify two regimes of behavior for the capillary height H-c(infinity) depending on the tube-to-particle-diameter ratio, D/d. For large D/d, a scaling of H-c(infinity) with the inverse of the tube diameter, which is reminiscent of liquids, is observed. However, when D/d decreases down to values smaller than a few particle sizes, a uniquely granular behavior is observed where H-c(infinity) increases linearly with the tube diameter.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Fan, Fengxian UNSPECIFIED UNSPECIFIED UNSPECIFIED Parteli, Eric J. R. UNSPECIFIED UNSPECIFIED UNSPECIFIED Poeschel, Thorsten UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-230758
DOI:	10.1103/PhysRevLett.118.218001
Journal or Publication Title:	Phys. Rev. Lett.
Volume:	118
Number:	21
Date:	2017
Publisher:	AMER PHYSICAL SOC
Place of Publication:	COLLEGE PK
ISSN:	1079-7114
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language DISCRETE ELEMENT METHOD; VERTICAL PIPE; DENSITY WAVES; DYNAMICS SIMULATIONS; NARROW PIPE; FLOW; CONVECTION; MODELS; GASES; DEM Multiple languages Physics, Multidisciplinary Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/23075