Contact angle mechanical influence in wet granular soils

Duriez, J; Wan, Richard

doi:10.1007/s11440-016-0500-6

Cited by 46 publications

(54 citation statements)

References 37 publications

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“…Then, the heterogeneous nucleation of capillary bridge formation and subsequent capillary condensation will not occur. Although the line tension cannot contribute directly to the normal capillary force between two substrates, the line tension indirectly affects the force through modification of the equilibrium contact angle [4]. Therefore, the interpretation of normal capillary force of nanoscale bridges needs caution, and the contact angle determination combined with the normal capillary force measurement should be carefully conducted.…”

Section: Discussionmentioning

confidence: 99%

“…The nanoscale liquid bridge which forms in a narrow slit between two small objects is a ubiquitous phenomenon occurring in humid atmospheres in our daily life. It plays a fundamental role in many natural and geological phenomena such as the water retention in soil [1][2][3][4], the wet friction [5], the biological adhesion of some insects [6,7], and the cloud formation [8] etc. It also plays an important role in various industrial processing such as that of the powders and the granular matters [9] and, in particular, in the modern nano-technologies and nano-fluidics [10,11].…”

Section: Introductionmentioning

confidence: 99%

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Effect of line tension on axisymmetric nanoscale capillary bridges at the liquid-vapor equilibrium

Iwamatsu

Mori

2019

Phys. Rev. E

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The effect of line tension on the axisymmetric nanoscale capillary bridge between two identical substrates with convex, concave and flat geometry at the liquid-vapor equilibrium is theoretically studied. The modified Young's equation for the contact angle, which takes into account the effect of line tension is derived on a general axisymmetric curved surface using the variational method. Even without the effect of line tension, the parameter space where the bridge can exist is limited simply by the geometry of substrates. The modified Young's equation further restricts the space where the bridge can exist when the line tension is positive because the equilibrium contact angle always remain finite and the wetting state near the zero contact angle cannot be realized. It is shown that the interplay of the geometry and the positive line tension restricts the formation of capillary bridge.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of line tension on axisymmetric nanoscale capillary bridges at the liquid-vapor equilibrium

Iwamatsu

Mori

2019

Phys. Rev. E

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“…While the contact stress tensor obviously coincides with the total stresses in dry granular samples, it also appears to be an adequate effective stress‐strength variable for describing failure in wet samples in Wan et al and Duriez and Wan . Further investigations also regarding its effective nature with respect to stress‐strain constitutive description are conducted in the next sections from a micromechanical DEM model that allows Equation or Equation to be used whereby the contact stress can be readily isolated and subsequently related to strains, given pertinent information on the microstructure.…”

Section: Micromechanical Description Of Wet Granular Materialsmentioning

confidence: 97%

“…In such an instance, the meniscus breaks and the capillary interaction is lost. All menisci creation and rupture occur in the model in a fully drained manner, the water content and saturation ratio possibly evolving during constant suction loading, see Duriez and Wan for more details.…”

Section: Micromechanical Description Of Wet Granular Materialsmentioning

confidence: 99%

“…Additional model parameters relate to the capillary interaction, such as the particle size distribution which is chosen herein as uniform in number between silt‐like extreme diameters D m i n and D m a x . Also, the value of air‐water surface tension at ambient temperature is retained for γ while a small, although not zero, contact angle θ is considered to enhance the mechanical effects of unsaturation and facilitate the analysis.…”

Section: Micromechanical Description Of Wet Granular Materialsmentioning

confidence: 99%

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Revisiting the existence of an effective stress for wet granular soils with micromechanics

Duriez

Wan

Pouragha

et al. 2018

Num Anal Meth Geomechanics

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Summary A possible effective stress variable for wet granular materials is numerically investigated based on an adapted discrete element method (DEM) model for an ideal three‐phase system. The DEM simulations consider granular materials made of nearly monodisperse spherical particles, in the pendular regime with the pore fluid mixture consisting of distinct water menisci bridging particle pairs. The contact force‐related stress contribution to the total stresses is isolated and tested as the effective stress candidate for dense or loose systems. It is first recalled that this contact stress tensor is indeed an adequate effective stress that describes stress limit states of wet samples with the same Mohr‐Coulomb criterion associated with their dry counterparts. As for constitutive relationships, it is demonstrated that the contact stress tensor used in conjunction with dry constitutive relations does describe the strains of wet samples during an initial strain regime but not beyond. Outside this so‐called quasi‐static strain regime, whose extent is much greater for dense than loose materials, dramatic changes in the contact network prevent macroscale contact stress‐strain relationships to apply in the same manner to dry and unsaturated conditions. The presented numerical results also reveal unexpected constitutive bifurcations for the loose material, related to stick‐slip macrobehavior.

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