Dynamics of a fully wetted Marangoni surfer at the fluid–fluid interface

Soft Matter ◽  
2019 ◽  
Vol 15 (10) ◽  
pp. 2284-2291 ◽  
Author(s):  
Harinadha Gidituri ◽  
Mahesh V. Panchagnula ◽  
Andrey Pototsky
Keyword(s):  
Surface Tension ◽  
Fluid Interfaces ◽  
Marangoni Flow ◽  
Fluid Interface

Marangoni flow created by the gradient of surface tension can be used to transport small objects along fluid interfaces.

Cavitation in lubrication. Part 1. On boundary conditions and cavity—fluid interfaces

1977 ◽  
Vol 80 (4) ◽  
pp. 743-755 ◽  
Author(s):  
M. D. Savage
Keyword(s):  
Surface Tension ◽  
Boundary Conditions ◽  
Fluid Pressure ◽  
Radius Of Curvature ◽  
Fluid Interfaces ◽  
Fluid Interface ◽  
Detailed Review ◽  
Lubrication Regime ◽  
Narrow Gaps ◽  
Small Disturbances

The flow of viscous lubricant in narrow gaps is considered for those geometries in which cavitation arises. A detailed review is presented of those boundary conditions which have been proposed for terminating the lubrication regime (i.e. those valid where the cavity forms). Finally it is shown that a uniform cavity-fluid interface remains stable to small disturbances provided that \[ \frac{d}{dx}\left(P+\frac{T}{r}\right) < 0, \] in which T and r represent the surface tension of the fluid and the radius of curvature of the interface respectively whilst dP/dx is the gradient of fluid pressure immediately upstream of the interface.

scholarly journals Enhanced interfacial deformation in a Marangoni flow: A measure of the dynamical surface tension

2018 ◽  
Vol 3 (2) ◽  
Author(s):  
Rodrigo Leite Pinto ◽  
Sébastien Le Roux ◽  
Isabelle Cantat ◽  
Arnaud Saint-Jalmes
Keyword(s):  
Surface Tension ◽  
Marangoni Flow ◽  
Interfacial Deformation

scholarly journals In situ assessment of the contact angles of nanoparticles adsorbed at fluid interfaces by multiple angle of incidence ellipsometry

Soft Matter ◽  
2014 ◽  
Vol 10 (36) ◽  
pp. 6999-7007 ◽  
Author(s):  
Antonio Stocco ◽  
Ge Su ◽  
Maurizio Nobili ◽  
Martin In ◽  
Dayang Wang
Keyword(s):  
Surface Coverage ◽  
Contact Angles ◽  
Fluid Interfaces ◽  
Angle Of Incidence ◽  
Fluid Interface ◽  
Colloidal Interactions ◽  
In Situ Assessment

Contact angles and surface coverage of nanoparticles adsorbing at the fluid interface are assessed by ellipsometry. Results reveal the competition between wetting and colloidal interactions.

Continuum and Molecular Dynamics Studies of the Hydrodynamics of Colloids Straddling a Fluid Interface

2021 ◽  
Vol 54 (1) ◽  
Author(s):  
Charles Maldarelli ◽  
Nicole T. Donovan ◽  
Subramaniam Chembai Ganesh ◽  
Subhabrata Das ◽  
Joel Koplik
Keyword(s):  
Molecular Dynamics ◽  
Characteristic Size ◽  
Two Dimensions ◽  
Annual Review ◽  
Publication Date ◽  
Fluid Interfaces ◽  
Particle Interactions ◽  
Fluid Interface ◽  
Interfacial Energies ◽  
Multiple Particle

Colloid-sized particles (10 nm–10 μm in characteristic size) adsorb onto fluid interfaces, where they minimize their interfacial energy by straddling the surface, immersing themselves partly in each phase bounding the interface. The energy minimum achieved by relocation to the surface can be orders of magnitude greater than the thermal energy, effectively trapping the particles into monolayers, allowing them freedom only to translate and rotate along the surface. Particles adsorbed at interfaces are models for the understanding of the dynamics and assembly of particles in two dimensions and have broad technological applications, importantly in foam and emulsion science and in the bottom-up fabrication of new materials based on their monolayer assemblies. In this review, the hydrodynamics of the colloid motion along the surface is examined from both continuum and molecular dynamics frameworks. The interfacial energies of adsorbed particles is discussed first, followed by the hydrodynamics, starting with isolated particles followed by pairwise and multiple particle interactions. The effect of particle shape is emphasized, and the role played by the immersion depth and the surface rheology is discussed; experiments illustrating the applicability of the hydrodynamic studies are also examined. Expected final online publication date for the Annual Review of Fluid Mechanics, Volume 54 is January 2022. Please see http://www.annualreviews.org/page/journal/pubdates for revised estimates.

Long Term Dynamics of Water-Entry Cavity

2010 ◽  
Author(s):  
Roderick R. La Foy ◽  
Sunghwan Jung ◽  
Pavlos Vlachos
Keyword(s):  
Surface Tension ◽  
Internal Pressure ◽  
Potential Flow ◽  
Water Entry ◽  
Cavity Volume ◽  
Fluid Interface ◽  
Simple Analysis ◽  
Liquid Pressure ◽  
Air Cavity

Many engineering applications involve the motion of objects crossing a fluid interface. The dynamics of this process are often complicated due to the interplay of surface tension, gravity, and inertia. Nevertheless, a simple analysis using potential flow theory works well to predict the interfacial profile of the air cavity formed during an impact. Most current theories however, cannot predict the behavior of the air cavity after pinch off occurs. We therefore investigated the long term dynamics of water entry in both experiment and theory. It was found that shortly after pinch off the cavity dynamics become governed primarily by thermodynamic gas relations. The internal pressure slowly rises due to the cavity volume decreasing while the ambient liquid pressure quickly increases as a result of the descent of the projectile. This effect is incorporated into our model to correctly predict the cavity geometry.

Dependence of the Contact Angle on Adsorption at the Solid-Liquid Interface

2010 ◽  
Author(s):  
C. A. Ward
Keyword(s):  
Surface Tension ◽  
Contact Angle ◽  
Pressure Range ◽  
Line Tension ◽  
Liquid Interface ◽  
Fluid Interfaces ◽  
Phase Line ◽  
Three Phase ◽  
Solid Liquid Interface ◽  
Solid Liquid

A method for determining the surface tension of solid-fluid interfaces has been proposed. For a given temperature and fluid-solid combination, these surface tensions are expressed in terms of material properties that can be determined by measuring the amount of vapor adsorbed on the solid surface as a function of xV, the ratio of the vapor-phase pressure to the saturation-vapor pressure. The thermodynamic concept of pressure is shown to be in conflict with that of continuum mechanics, but is supported experimentally. This approach leads to the prediction that the contact angle, θ, can only exist in a narrow pressure range and that in this pressure range, the solid-vapor surface tension is constant and equal to the surface tension of the liquid-vapor interface, γLV. The surface tension of the solid-liquid interface, γSL, may be expressed in terms of measurable properties, γLV and θ: γSL = γLV(1 − cosθ). The value of θ is predicted to depend on both the pressure in the liquid at the three-phase, line x3L, and the three-phase line curvature, Ccl. We examine these predictions using sessile water droplets on a polished Cu surface, maintained in a closed, constant volume, isothermal container. The value of θ is found to depend on the adsorption at the solid-liquid interface, nSL = nSL(x3L,Ccl). The predicted value of θ is compared with that measured, and found to be in close agreement, but no effect of line tension is found.

Role of electrostatic interactions in the adsorption kinetics of nanoparticles at fluid–fluid interfaces

2016 ◽  
Vol 18 (7) ◽  
pp. 5499-5508 ◽  
Author(s):  
Venkateshwar Rao Dugyala ◽  
Jyothi Sri Muthukuru ◽  
Ethayaraja Mani ◽  
Madivala G. Basavaraj
Keyword(s):  
Surface Tension ◽  
Adsorption Kinetics ◽  
Electrostatic Interaction ◽  
Electrostatic Interactions ◽  
Dynamic Surface Tension ◽  
Nano Particles ◽  
Fluid Interfaces ◽  
Dynamic Surface ◽  
Kinetics Of

The dynamic surface tension measurements are used to elucidate the contribution of electrostatic interaction energy barriers for the adsorption of nano-particles to the interfaces.

scholarly journals Interface deformations affect the orientation transition of magnetic ellipsoidal particles adsorbed at fluid–fluid interfaces

Soft Matter ◽  
2014 ◽  
Vol 10 (35) ◽  
pp. 6742-6748 ◽  
Author(s):  
Gary B. Davies ◽  
Timm Krüger ◽  
Peter V. Coveney ◽  
Jens Harting ◽  
Fernando Bresme
Keyword(s):  
Magnetic Field ◽  
Fluid Interfaces ◽  
Fluid Interface ◽  
Ellipsoidal Particles ◽  
Particle Monolayer

Magnetic ellipsoidal particles adsorbed at a fluid–fluid interface create dipolar interface deformations in response to a magnetic field, which affects their orientation and may lead to novel particle monolayer structures.

Interfacial phenomena of molten silicon: Marangoni flow and surface tension

1998 ◽  
Vol 356 (1739) ◽  
pp. 899-909 ◽  
Author(s):  
Taketoshi Hibiya ◽  
Shin Nakamura ◽  
Kusuhiro Mukai ◽  
Zheng–Gang Niu ◽  
Nobuyuki Imaishi ◽  
...  
Keyword(s):  
Surface Tension ◽  
Interfacial Phenomena ◽  
Molten Silicon ◽  
Marangoni Flow
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